drivers/scsi/fcoe/fcoe_sysfs.c

   1 /*
   2  * Copyright(c) 2011 - 2012 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16  *
  17  * Maintained at www.Open-FCoE.org
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/kernel.h>
  23 #include <linux/etherdevice.h>
  24 #include <linux/ctype.h>
  25
  26 #include <scsi/fcoe_sysfs.h>
  27 #include <scsi/libfcoe.h>
  28
  29 /*
  30  * OK to include local libfcoe.h for debug_logging, but cannot include
  31  * <scsi/libfcoe.h> otherwise non-netdev based fcoe solutions would have
  32  * have to include more than fcoe_sysfs.h.
  33  */
  34 #include "libfcoe.h"
  35
  36 static atomic_t ctlr_num;
  37 static atomic_t fcf_num;
  38
  39 /*
  40  * fcoe_fcf_dev_loss_tmo: the default number of seconds that fcoe sysfs
  41  * should insulate the loss of a fcf.
  42  */
  43 static unsigned int fcoe_fcf_dev_loss_tmo = 1800;  /* seconds */
  44
  45 module_param_named(fcf_dev_loss_tmo, fcoe_fcf_dev_loss_tmo,
  46                    uint, S_IRUGO|S_IWUSR);
  47 MODULE_PARM_DESC(fcf_dev_loss_tmo,
  48                  "Maximum number of seconds that libfcoe should"
  49                  " insulate the loss of a fcf. Once this value is"
  50                  " exceeded, the fcf is removed.");
  51
  52 /*
  53  * These are used by the fcoe_*_show_function routines, they
  54  * are intentionally placed in the .c file as they're not intended
  55  * for use throughout the code.
  56  */
  57 #define fcoe_ctlr_id(x)                         \
  58         ((x)->id)
  59 #define fcoe_ctlr_work_q_name(x)                \
  60         ((x)->work_q_name)
  61 #define fcoe_ctlr_work_q(x)                     \
  62         ((x)->work_q)
  63 #define fcoe_ctlr_devloss_work_q_name(x)        \
  64         ((x)->devloss_work_q_name)
  65 #define fcoe_ctlr_devloss_work_q(x)             \
  66         ((x)->devloss_work_q)
  67 #define fcoe_ctlr_mode(x)                       \
  68         ((x)->mode)
  69 #define fcoe_ctlr_fcf_dev_loss_tmo(x)           \
  70         ((x)->fcf_dev_loss_tmo)
  71 #define fcoe_ctlr_link_fail(x)                  \
  72         ((x)->lesb.lesb_link_fail)
  73 #define fcoe_ctlr_vlink_fail(x)                 \
  74         ((x)->lesb.lesb_vlink_fail)
  75 #define fcoe_ctlr_miss_fka(x)                   \
  76         ((x)->lesb.lesb_miss_fka)
  77 #define fcoe_ctlr_symb_err(x)                   \
  78         ((x)->lesb.lesb_symb_err)
  79 #define fcoe_ctlr_err_block(x)                  \
  80         ((x)->lesb.lesb_err_block)
  81 #define fcoe_ctlr_fcs_error(x)                  \
  82         ((x)->lesb.lesb_fcs_error)
  83 #define fcoe_ctlr_enabled(x)                    \
  84         ((x)->enabled)
  85 #define fcoe_fcf_state(x)                       \
  86         ((x)->state)
  87 #define fcoe_fcf_fabric_name(x)                 \
  88         ((x)->fabric_name)
  89 #define fcoe_fcf_switch_name(x)                 \
  90         ((x)->switch_name)
  91 #define fcoe_fcf_fc_map(x)                      \
  92         ((x)->fc_map)
  93 #define fcoe_fcf_vfid(x)                        \
  94         ((x)->vfid)
  95 #define fcoe_fcf_mac(x)                         \
  96         ((x)->mac)
  97 #define fcoe_fcf_priority(x)                    \
  98         ((x)->priority)
  99 #define fcoe_fcf_fka_period(x)                  \
 100         ((x)->fka_period)
 101 #define fcoe_fcf_dev_loss_tmo(x)                \
 102         ((x)->dev_loss_tmo)
 103 #define fcoe_fcf_selected(x)                    \
 104         ((x)->selected)
 105 #define fcoe_fcf_vlan_id(x)                     \
 106         ((x)->vlan_id)
 107
 108 /*
 109  * dev_loss_tmo attribute
 110  */
 111 static int fcoe_str_to_dev_loss(const char *buf, unsigned long *val)
 112 {
 113         int ret;
 114
 115         ret = kstrtoul(buf, 0, val);
 116         if (ret)
 117                 return -EINVAL;
 118         /*
 119          * Check for overflow; dev_loss_tmo is u32
 120          */
 121         if (*val > UINT_MAX)
 122                 return -EINVAL;
 123
 124         return 0;
 125 }
 126
 127 static int fcoe_fcf_set_dev_loss_tmo(struct fcoe_fcf_device *fcf,
 128                                      unsigned long val)
 129 {
 130         if ((fcf->state == FCOE_FCF_STATE_UNKNOWN) ||
 131             (fcf->state == FCOE_FCF_STATE_DISCONNECTED) ||
 132             (fcf->state == FCOE_FCF_STATE_DELETED))
 133                 return -EBUSY;
 134         /*
 135          * Check for overflow; dev_loss_tmo is u32
 136          */
 137         if (val > UINT_MAX)
 138                 return -EINVAL;
 139
 140         fcoe_fcf_dev_loss_tmo(fcf) = val;
 141         return 0;
 142 }
 143
 144 #define FCOE_DEVICE_ATTR(_prefix, _name, _mode, _show, _store)  \
 145 struct device_attribute device_attr_fcoe_##_prefix##_##_name =  \
 146         __ATTR(_name, _mode, _show, _store)
 147
 148 #define fcoe_ctlr_show_function(field, format_string, sz, cast) \
 149 static ssize_t show_fcoe_ctlr_device_##field(struct device *dev, \
 150                                             struct device_attribute *attr, \
 151                                             char *buf)                  \
 152 {                                                                       \
 153         struct fcoe_ctlr_device *ctlr = dev_to_ctlr(dev);               \
 154         if (ctlr->f->get_fcoe_ctlr_##field)                             \
 155                 ctlr->f->get_fcoe_ctlr_##field(ctlr);                   \
 156         return snprintf(buf, sz, format_string,                         \
 157                         cast fcoe_ctlr_##field(ctlr));                  \
 158 }
 159
 160 #define fcoe_fcf_show_function(field, format_string, sz, cast)  \
 161 static ssize_t show_fcoe_fcf_device_##field(struct device *dev, \
 162                                            struct device_attribute *attr, \
 163                                            char *buf)                   \
 164 {                                                                       \
 165         struct fcoe_fcf_device *fcf = dev_to_fcf(dev);                  \
 166         struct fcoe_ctlr_device *ctlr = fcoe_fcf_dev_to_ctlr_dev(fcf);  \
 167         if (ctlr->f->get_fcoe_fcf_##field)                              \
 168                 ctlr->f->get_fcoe_fcf_##field(fcf);                     \
 169         return snprintf(buf, sz, format_string,                         \
 170                         cast fcoe_fcf_##field(fcf));                    \
 171 }
 172
 173 #define fcoe_ctlr_private_show_function(field, format_string, sz, cast) \
 174 static ssize_t show_fcoe_ctlr_device_##field(struct device *dev, \
 175                                             struct device_attribute *attr, \
 176                                             char *buf)                  \
 177 {                                                                       \
 178         struct fcoe_ctlr_device *ctlr = dev_to_ctlr(dev);               \
 179         return snprintf(buf, sz, format_string, cast fcoe_ctlr_##field(ctlr)); \
 180 }
 181
 182 #define fcoe_fcf_private_show_function(field, format_string, sz, cast)  \
 183 static ssize_t show_fcoe_fcf_device_##field(struct device *dev, \
 184                                            struct device_attribute *attr, \
 185                                            char *buf)                   \
 186 {                                                               \
 187         struct fcoe_fcf_device *fcf = dev_to_fcf(dev);                  \
 188         return snprintf(buf, sz, format_string, cast fcoe_fcf_##field(fcf)); \
 189 }
 190
 191 #define fcoe_ctlr_private_rd_attr(field, format_string, sz)             \
 192         fcoe_ctlr_private_show_function(field, format_string, sz, )     \
 193         static FCOE_DEVICE_ATTR(ctlr, field, S_IRUGO,                   \
 194                                 show_fcoe_ctlr_device_##field, NULL)
 195
 196 #define fcoe_ctlr_rd_attr(field, format_string, sz)                     \
 197         fcoe_ctlr_show_function(field, format_string, sz, )             \
 198         static FCOE_DEVICE_ATTR(ctlr, field, S_IRUGO,                   \
 199                                 show_fcoe_ctlr_device_##field, NULL)
 200
 201 #define fcoe_fcf_rd_attr(field, format_string, sz)                      \
 202         fcoe_fcf_show_function(field, format_string, sz, )              \
 203         static FCOE_DEVICE_ATTR(fcf, field, S_IRUGO,                    \
 204                                 show_fcoe_fcf_device_##field, NULL)
 205
 206 #define fcoe_fcf_private_rd_attr(field, format_string, sz)              \
 207         fcoe_fcf_private_show_function(field, format_string, sz, )      \
 208         static FCOE_DEVICE_ATTR(fcf, field, S_IRUGO,                    \
 209                                 show_fcoe_fcf_device_##field, NULL)
 210
 211 #define fcoe_ctlr_private_rd_attr_cast(field, format_string, sz, cast)  \
 212         fcoe_ctlr_private_show_function(field, format_string, sz, (cast)) \
 213         static FCOE_DEVICE_ATTR(ctlr, field, S_IRUGO,                   \
 214                                 show_fcoe_ctlr_device_##field, NULL)
 215
 216 #define fcoe_fcf_private_rd_attr_cast(field, format_string, sz, cast)   \
 217         fcoe_fcf_private_show_function(field, format_string, sz, (cast)) \
 218         static FCOE_DEVICE_ATTR(fcf, field, S_IRUGO,                    \
 219                                 show_fcoe_fcf_device_##field, NULL)
 220
 221 #define fcoe_enum_name_search(title, table_type, table)                 \
 222 static const char *get_fcoe_##title##_name(enum table_type table_key)   \
 223 {                                                                       \
 224         if (table_key < 0 || table_key >= ARRAY_SIZE(table))            \
 225                 return NULL;                                            \
 226         return table[table_key];                                        \
 227 }
 228
 229 static char *fip_conn_type_names[] = {
 230         [ FIP_CONN_TYPE_UNKNOWN ] = "Unknown",
 231         [ FIP_CONN_TYPE_FABRIC ]  = "Fabric",
 232         [ FIP_CONN_TYPE_VN2VN ]   = "VN2VN",
 233 };
 234 fcoe_enum_name_search(ctlr_mode, fip_conn_type, fip_conn_type_names)
 235
 236 static enum fip_conn_type fcoe_parse_mode(const char *buf)
 237 {
 238         int i;
 239
 240         for (i = 0; i < ARRAY_SIZE(fip_conn_type_names); i++) {
 241                 if (strcasecmp(buf, fip_conn_type_names[i]) == 0)
 242                         return i;
 243         }
 244
 245         return FIP_CONN_TYPE_UNKNOWN;
 246 }
 247
 248 static char *fcf_state_names[] = {
 249         [ FCOE_FCF_STATE_UNKNOWN ]      = "Unknown",
 250         [ FCOE_FCF_STATE_DISCONNECTED ] = "Disconnected",
 251         [ FCOE_FCF_STATE_CONNECTED ]    = "Connected",
 252 };
 253 fcoe_enum_name_search(fcf_state, fcf_state, fcf_state_names)
 254 #define FCOE_FCF_STATE_MAX_NAMELEN 50
 255
 256 static ssize_t show_fcf_state(struct device *dev,
 257                               struct device_attribute *attr,
 258                               char *buf)
 259 {
 260         struct fcoe_fcf_device *fcf = dev_to_fcf(dev);
 261         const char *name;
 262         name = get_fcoe_fcf_state_name(fcf->state);
 263         if (!name)
 264                 return -EINVAL;
 265         return snprintf(buf, FCOE_FCF_STATE_MAX_NAMELEN, "%s\n", name);
 266 }
 267 static FCOE_DEVICE_ATTR(fcf, state, S_IRUGO, show_fcf_state, NULL);
 268
 269 #define FCOE_MAX_MODENAME_LEN 20
 270 static ssize_t show_ctlr_mode(struct device *dev,
 271                               struct device_attribute *attr,
 272                               char *buf)
 273 {
 274         struct fcoe_ctlr_device *ctlr = dev_to_ctlr(dev);
 275         const char *name;
 276
 277         name = get_fcoe_ctlr_mode_name(ctlr->mode);
 278         if (!name)
 279                 return -EINVAL;
 280         return snprintf(buf, FCOE_MAX_MODENAME_LEN,
 281                         "%s\n", name);
 282 }
 283
 284 static ssize_t store_ctlr_mode(struct device *dev,
 285                                struct device_attribute *attr,
 286                                const char *buf, size_t count)
 287 {
 288         struct fcoe_ctlr_device *ctlr = dev_to_ctlr(dev);
 289         char mode[FCOE_MAX_MODENAME_LEN + 1];
 290
 291         if (count > FCOE_MAX_MODENAME_LEN)
 292                 return -EINVAL;
 293
 294         strncpy(mode, buf, count);
 295
 296         if (mode[count - 1] == '\n')
 297                 mode[count - 1] = '\0';
 298         else
 299                 mode[count] = '\0';
 300
 301         switch (ctlr->enabled) {
 302         case FCOE_CTLR_ENABLED:
 303                 LIBFCOE_SYSFS_DBG(ctlr, "Cannot change mode when enabled.\n");
 304                 return -EBUSY;
 305         case FCOE_CTLR_DISABLED:
 306                 if (!ctlr->f->set_fcoe_ctlr_mode) {
 307                         LIBFCOE_SYSFS_DBG(ctlr,
 308                                           "Mode change not supported by LLD.\n");
 309                         return -ENOTSUPP;
 310                 }
 311
 312                 ctlr->mode = fcoe_parse_mode(mode);
 313                 if (ctlr->mode == FIP_CONN_TYPE_UNKNOWN) {
 314                         LIBFCOE_SYSFS_DBG(ctlr, "Unknown mode %s provided.\n",
 315                                           buf);
 316                         return -EINVAL;
 317                 }
 318
 319                 ctlr->f->set_fcoe_ctlr_mode(ctlr);
 320                 LIBFCOE_SYSFS_DBG(ctlr, "Mode changed to %s.\n", buf);
 321
 322                 return count;
 323         case FCOE_CTLR_UNUSED:
 324         default:
 325                 LIBFCOE_SYSFS_DBG(ctlr, "Mode change not supported.\n");
 326                 return -ENOTSUPP;
 327         };
 328 }
 329
 330 static FCOE_DEVICE_ATTR(ctlr, mode, S_IRUGO | S_IWUSR,
 331                         show_ctlr_mode, store_ctlr_mode);
 332
 333 static ssize_t store_ctlr_enabled(struct device *dev,
 334                                   struct device_attribute *attr,
 335                                   const char *buf, size_t count)
 336 {
 337         struct fcoe_ctlr_device *ctlr = dev_to_ctlr(dev);
 338         int rc;
 339
 340         switch (ctlr->enabled) {
 341         case FCOE_CTLR_ENABLED:
 342                 if (*buf == '1')
 343                         return count;
 344                 ctlr->enabled = FCOE_CTLR_DISABLED;
 345                 break;
 346         case FCOE_CTLR_DISABLED:
 347                 if (*buf == '0')
 348                         return count;
 349                 ctlr->enabled = FCOE_CTLR_ENABLED;
 350                 break;
 351         case FCOE_CTLR_UNUSED:
 352                 return -ENOTSUPP;
 353         };
 354
 355         rc = ctlr->f->set_fcoe_ctlr_enabled(ctlr);
 356         if (rc)
 357                 return rc;
 358
 359         return count;
 360 }
 361
 362 static char *ctlr_enabled_state_names[] = {
 363         [ FCOE_CTLR_ENABLED ]  = "1",
 364         [ FCOE_CTLR_DISABLED ] = "0",
 365 };
 366 fcoe_enum_name_search(ctlr_enabled_state, ctlr_enabled_state,
 367                       ctlr_enabled_state_names)
 368 #define FCOE_CTLR_ENABLED_MAX_NAMELEN 50
 369
 370 static ssize_t show_ctlr_enabled_state(struct device *dev,
 371                                        struct device_attribute *attr,
 372                                        char *buf)
 373 {
 374         struct fcoe_ctlr_device *ctlr = dev_to_ctlr(dev);
 375         const char *name;
 376
 377         name = get_fcoe_ctlr_enabled_state_name(ctlr->enabled);
 378         if (!name)
 379                 return -EINVAL;
 380         return snprintf(buf, FCOE_CTLR_ENABLED_MAX_NAMELEN,
 381                         "%s\n", name);
 382 }
 383
 384 static FCOE_DEVICE_ATTR(ctlr, enabled, S_IRUGO | S_IWUSR,
 385                         show_ctlr_enabled_state,
 386                         store_ctlr_enabled);
 387
 388 static ssize_t
 389 store_private_fcoe_ctlr_fcf_dev_loss_tmo(struct device *dev,
 390                                          struct device_attribute *attr,
 391                                          const char *buf, size_t count)
 392 {
 393         struct fcoe_ctlr_device *ctlr = dev_to_ctlr(dev);
 394         struct fcoe_fcf_device *fcf;
 395         unsigned long val;
 396         int rc;
 397
 398         rc = fcoe_str_to_dev_loss(buf, &val);
 399         if (rc)
 400                 return rc;
 401
 402         fcoe_ctlr_fcf_dev_loss_tmo(ctlr) = val;
 403         mutex_lock(&ctlr->lock);
 404         list_for_each_entry(fcf, &ctlr->fcfs, peers)
 405                 fcoe_fcf_set_dev_loss_tmo(fcf, val);
 406         mutex_unlock(&ctlr->lock);
 407         return count;
 408 }
 409 fcoe_ctlr_private_show_function(fcf_dev_loss_tmo, "%d\n", 20, );
 410 static FCOE_DEVICE_ATTR(ctlr, fcf_dev_loss_tmo, S_IRUGO | S_IWUSR,
 411                         show_fcoe_ctlr_device_fcf_dev_loss_tmo,
 412                         store_private_fcoe_ctlr_fcf_dev_loss_tmo);
 413
 414 /* Link Error Status Block (LESB) */
 415 fcoe_ctlr_rd_attr(link_fail, "%u\n", 20);
 416 fcoe_ctlr_rd_attr(vlink_fail, "%u\n", 20);
 417 fcoe_ctlr_rd_attr(miss_fka, "%u\n", 20);
 418 fcoe_ctlr_rd_attr(symb_err, "%u\n", 20);
 419 fcoe_ctlr_rd_attr(err_block, "%u\n", 20);
 420 fcoe_ctlr_rd_attr(fcs_error, "%u\n", 20);
 421
 422 fcoe_fcf_private_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
 423 fcoe_fcf_private_rd_attr_cast(switch_name, "0x%llx\n", 20, unsigned long long);
 424 fcoe_fcf_private_rd_attr(priority, "%u\n", 20);
 425 fcoe_fcf_private_rd_attr(fc_map, "0x%x\n", 20);
 426 fcoe_fcf_private_rd_attr(vfid, "%u\n", 20);
 427 fcoe_fcf_private_rd_attr(mac, "%pM\n", 20);
 428 fcoe_fcf_private_rd_attr(fka_period, "%u\n", 20);
 429 fcoe_fcf_rd_attr(selected, "%u\n", 20);
 430 fcoe_fcf_rd_attr(vlan_id, "%u\n", 20);
 431
 432 fcoe_fcf_private_show_function(dev_loss_tmo, "%d\n", 20, )
 433 static ssize_t
 434 store_fcoe_fcf_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
 435                             const char *buf, size_t count)
 436 {
 437         struct fcoe_fcf_device *fcf = dev_to_fcf(dev);
 438         unsigned long val;
 439         int rc;
 440
 441         rc = fcoe_str_to_dev_loss(buf, &val);
 442         if (rc)
 443                 return rc;
 444
 445         rc = fcoe_fcf_set_dev_loss_tmo(fcf, val);
 446         if (rc)
 447                 return rc;
 448         return count;
 449 }
 450 static FCOE_DEVICE_ATTR(fcf, dev_loss_tmo, S_IRUGO | S_IWUSR,
 451                         show_fcoe_fcf_device_dev_loss_tmo,
 452                         store_fcoe_fcf_dev_loss_tmo);
 453
 454 static struct attribute *fcoe_ctlr_lesb_attrs[] = {
 455         &device_attr_fcoe_ctlr_link_fail.attr,
 456         &device_attr_fcoe_ctlr_vlink_fail.attr,
 457         &device_attr_fcoe_ctlr_miss_fka.attr,
 458         &device_attr_fcoe_ctlr_symb_err.attr,
 459         &device_attr_fcoe_ctlr_err_block.attr,
 460         &device_attr_fcoe_ctlr_fcs_error.attr,
 461         NULL,
 462 };
 463
 464 static struct attribute_group fcoe_ctlr_lesb_attr_group = {
 465         .name = "lesb",
 466         .attrs = fcoe_ctlr_lesb_attrs,
 467 };
 468
 469 static struct attribute *fcoe_ctlr_attrs[] = {
 470         &device_attr_fcoe_ctlr_fcf_dev_loss_tmo.attr,
 471         &device_attr_fcoe_ctlr_enabled.attr,
 472         &device_attr_fcoe_ctlr_mode.attr,
 473         NULL,
 474 };
 475
 476 static struct attribute_group fcoe_ctlr_attr_group = {
 477         .attrs = fcoe_ctlr_attrs,
 478 };
 479
 480 static const struct attribute_group *fcoe_ctlr_attr_groups[] = {
 481         &fcoe_ctlr_attr_group,
 482         &fcoe_ctlr_lesb_attr_group,
 483         NULL,
 484 };
 485
 486 static struct attribute *fcoe_fcf_attrs[] = {
 487         &device_attr_fcoe_fcf_fabric_name.attr,
 488         &device_attr_fcoe_fcf_switch_name.attr,
 489         &device_attr_fcoe_fcf_dev_loss_tmo.attr,
 490         &device_attr_fcoe_fcf_fc_map.attr,
 491         &device_attr_fcoe_fcf_vfid.attr,
 492         &device_attr_fcoe_fcf_mac.attr,
 493         &device_attr_fcoe_fcf_priority.attr,
 494         &device_attr_fcoe_fcf_fka_period.attr,
 495         &device_attr_fcoe_fcf_state.attr,
 496         &device_attr_fcoe_fcf_selected.attr,
 497         &device_attr_fcoe_fcf_vlan_id.attr,
 498         NULL
 499 };
 500
 501 static struct attribute_group fcoe_fcf_attr_group = {
 502         .attrs = fcoe_fcf_attrs,
 503 };
 504
 505 static const struct attribute_group *fcoe_fcf_attr_groups[] = {
 506         &fcoe_fcf_attr_group,
 507         NULL,
 508 };
 509
 510 static struct bus_type fcoe_bus_type;
 511
 512 static int fcoe_bus_match(struct device *dev,
 513                           struct device_driver *drv)
 514 {
 515         if (dev->bus == &fcoe_bus_type)
 516                 return 1;
 517         return 0;
 518 }
 519
 520 /**
 521  * fcoe_ctlr_device_release() - Release the FIP ctlr memory
 522  * @dev: Pointer to the FIP ctlr's embedded device
 523  *
 524  * Called when the last FIP ctlr reference is released.
 525  */
 526 static void fcoe_ctlr_device_release(struct device *dev)
 527 {
 528         struct fcoe_ctlr_device *ctlr = dev_to_ctlr(dev);
 529         kfree(ctlr);
 530 }
 531
 532 /**
 533  * fcoe_fcf_device_release() - Release the FIP fcf memory
 534  * @dev: Pointer to the fcf's embedded device
 535  *
 536  * Called when the last FIP fcf reference is released.
 537  */
 538 static void fcoe_fcf_device_release(struct device *dev)
 539 {
 540         struct fcoe_fcf_device *fcf = dev_to_fcf(dev);
 541         kfree(fcf);
 542 }
 543
 544 static struct device_type fcoe_ctlr_device_type = {
 545         .name = "fcoe_ctlr",
 546         .groups = fcoe_ctlr_attr_groups,
 547         .release = fcoe_ctlr_device_release,
 548 };
 549
 550 static struct device_type fcoe_fcf_device_type = {
 551         .name = "fcoe_fcf",
 552         .groups = fcoe_fcf_attr_groups,
 553         .release = fcoe_fcf_device_release,
 554 };
 555
 556 static BUS_ATTR(ctlr_create, S_IWUSR, NULL, fcoe_ctlr_create_store);
 557 static BUS_ATTR(ctlr_destroy, S_IWUSR, NULL, fcoe_ctlr_destroy_store);
 558
 559 static struct attribute *fcoe_bus_attrs[] = {
 560         &bus_attr_ctlr_create.attr,
 561         &bus_attr_ctlr_destroy.attr,
 562         NULL,
 563 };
 564 ATTRIBUTE_GROUPS(fcoe_bus);
 565
 566 static struct bus_type fcoe_bus_type = {
 567         .name = "fcoe",
 568         .match = &fcoe_bus_match,
 569         .bus_groups = fcoe_bus_groups,
 570 };
 571
 572 /**
 573  * fcoe_ctlr_device_flush_work() - Flush a FIP ctlr's workqueue
 574  * @ctlr: Pointer to the FIP ctlr whose workqueue is to be flushed
 575  */
 576 static void fcoe_ctlr_device_flush_work(struct fcoe_ctlr_device *ctlr)
 577 {
 578         if (!fcoe_ctlr_work_q(ctlr)) {
 579                 printk(KERN_ERR
 580                        "ERROR: FIP Ctlr '%d' attempted to flush work, "
 581                        "when no workqueue created.\n", ctlr->id);
 582                 dump_stack();
 583                 return;
 584         }
 585
 586         flush_workqueue(fcoe_ctlr_work_q(ctlr));
 587 }
 588
 589 /**
 590  * fcoe_ctlr_device_queue_work() - Schedule work for a FIP ctlr's workqueue
 591  * @ctlr: Pointer to the FIP ctlr who owns the devloss workqueue
 592  * @work:   Work to queue for execution
 593  *
 594  * Return value:
 595  *      1 on success / 0 already queued / < 0 for error
 596  */
 597 static int fcoe_ctlr_device_queue_work(struct fcoe_ctlr_device *ctlr,
 598                                        struct work_struct *work)
 599 {
 600         if (unlikely(!fcoe_ctlr_work_q(ctlr))) {
 601                 printk(KERN_ERR
 602                        "ERROR: FIP Ctlr '%d' attempted to queue work, "
 603                        "when no workqueue created.\n", ctlr->id);
 604                 dump_stack();
 605
 606                 return -EINVAL;
 607         }
 608
 609         return queue_work(fcoe_ctlr_work_q(ctlr), work);
 610 }
 611
 612 /**
 613  * fcoe_ctlr_device_flush_devloss() - Flush a FIP ctlr's devloss workqueue
 614  * @ctlr: Pointer to FIP ctlr whose workqueue is to be flushed
 615  */
 616 static void fcoe_ctlr_device_flush_devloss(struct fcoe_ctlr_device *ctlr)
 617 {
 618         if (!fcoe_ctlr_devloss_work_q(ctlr)) {
 619                 printk(KERN_ERR
 620                        "ERROR: FIP Ctlr '%d' attempted to flush work, "
 621                        "when no workqueue created.\n", ctlr->id);
 622                 dump_stack();
 623                 return;
 624         }
 625
 626         flush_workqueue(fcoe_ctlr_devloss_work_q(ctlr));
 627 }
 628
 629 /**
 630  * fcoe_ctlr_device_queue_devloss_work() - Schedule work for a FIP ctlr's devloss workqueue
 631  * @ctlr: Pointer to the FIP ctlr who owns the devloss workqueue
 632  * @work:   Work to queue for execution
 633  * @delay:  jiffies to delay the work queuing
 634  *
 635  * Return value:
 636  *      1 on success / 0 already queued / < 0 for error
 637  */
 638 static int fcoe_ctlr_device_queue_devloss_work(struct fcoe_ctlr_device *ctlr,
 639                                                struct delayed_work *work,
 640                                                unsigned long delay)
 641 {
 642         if (unlikely(!fcoe_ctlr_devloss_work_q(ctlr))) {
 643                 printk(KERN_ERR
 644                        "ERROR: FIP Ctlr '%d' attempted to queue work, "
 645                        "when no workqueue created.\n", ctlr->id);
 646                 dump_stack();
 647
 648                 return -EINVAL;
 649         }
 650
 651         return queue_delayed_work(fcoe_ctlr_devloss_work_q(ctlr), work, delay);
 652 }
 653
 654 static int fcoe_fcf_device_match(struct fcoe_fcf_device *new,
 655                                  struct fcoe_fcf_device *old)
 656 {
 657         if (new->switch_name == old->switch_name &&
 658             new->fabric_name == old->fabric_name &&
 659             new->fc_map == old->fc_map &&
 660             ether_addr_equal(new->mac, old->mac))
 661                 return 1;
 662         return 0;
 663 }
 664
 665 /**
 666  * fcoe_ctlr_device_add() - Add a FIP ctlr to sysfs
 667  * @parent:    The parent device to which the fcoe_ctlr instance
 668  *             should be attached
 669  * @f:         The LLD's FCoE sysfs function template pointer
 670  * @priv_size: Size to be allocated with the fcoe_ctlr_device for the LLD
 671  *
 672  * This routine allocates a FIP ctlr object with some additional memory
 673  * for the LLD. The FIP ctlr is initialized, added to sysfs and then
 674  * attributes are added to it.
 675  */
 676 struct fcoe_ctlr_device *fcoe_ctlr_device_add(struct device *parent,
 677                                     struct fcoe_sysfs_function_template *f,
 678                                     int priv_size)
 679 {
 680         struct fcoe_ctlr_device *ctlr;
 681         int error = 0;
 682
 683         ctlr = kzalloc(sizeof(struct fcoe_ctlr_device) + priv_size,
 684                        GFP_KERNEL);
 685         if (!ctlr)
 686                 goto out;
 687
 688         ctlr->id = atomic_inc_return(&ctlr_num) - 1;
 689         ctlr->f = f;
 690         ctlr->mode = FIP_CONN_TYPE_FABRIC;
 691         INIT_LIST_HEAD(&ctlr->fcfs);
 692         mutex_init(&ctlr->lock);
 693         ctlr->dev.parent = parent;
 694         ctlr->dev.bus = &fcoe_bus_type;
 695         ctlr->dev.type = &fcoe_ctlr_device_type;
 696
 697         ctlr->fcf_dev_loss_tmo = fcoe_fcf_dev_loss_tmo;
 698
 699         snprintf(ctlr->work_q_name, sizeof(ctlr->work_q_name),
 700                  "ctlr_wq_%d", ctlr->id);
 701         ctlr->work_q = create_singlethread_workqueue(
 702                 ctlr->work_q_name);
 703         if (!ctlr->work_q)
 704                 goto out_del;
 705
 706         snprintf(ctlr->devloss_work_q_name,
 707                  sizeof(ctlr->devloss_work_q_name),
 708                  "ctlr_dl_wq_%d", ctlr->id);
 709         ctlr->devloss_work_q = create_singlethread_workqueue(
 710                 ctlr->devloss_work_q_name);
 711         if (!ctlr->devloss_work_q)
 712                 goto out_del_q;
 713
 714         dev_set_name(&ctlr->dev, "ctlr_%d", ctlr->id);
 715         error = device_register(&ctlr->dev);
 716         if (error)
 717                 goto out_del_q2;
 718
 719         return ctlr;
 720
 721 out_del_q2:
 722         destroy_workqueue(ctlr->devloss_work_q);
 723         ctlr->devloss_work_q = NULL;
 724 out_del_q:
 725         destroy_workqueue(ctlr->work_q);
 726         ctlr->work_q = NULL;
 727 out_del:
 728         kfree(ctlr);
 729 out:
 730         return NULL;
 731 }
 732 EXPORT_SYMBOL_GPL(fcoe_ctlr_device_add);
 733
 734 /**
 735  * fcoe_ctlr_device_delete() - Delete a FIP ctlr and its subtree from sysfs
 736  * @ctlr: A pointer to the ctlr to be deleted
 737  *
 738  * Deletes a FIP ctlr and any fcfs attached
 739  * to it. Deleting fcfs will cause their childen
 740  * to be deleted as well.
 741  *
 742  * The ctlr is detached from sysfs and it's resources
 743  * are freed (work q), but the memory is not freed
 744  * until its last reference is released.
 745  *
 746  * This routine expects no locks to be held before
 747  * calling.
 748  *
 749  * TODO: Currently there are no callbacks to clean up LLD data
 750  * for a fcoe_fcf_device. LLDs must keep this in mind as they need
 751  * to clean up each of their LLD data for all fcoe_fcf_device before
 752  * calling fcoe_ctlr_device_delete.
 753  */
 754 void fcoe_ctlr_device_delete(struct fcoe_ctlr_device *ctlr)
 755 {
 756         struct fcoe_fcf_device *fcf, *next;
 757         /* Remove any attached fcfs */
 758         mutex_lock(&ctlr->lock);
 759         list_for_each_entry_safe(fcf, next,
 760                                  &ctlr->fcfs, peers) {
 761                 list_del(&fcf->peers);
 762                 fcf->state = FCOE_FCF_STATE_DELETED;
 763                 fcoe_ctlr_device_queue_work(ctlr, &fcf->delete_work);
 764         }
 765         mutex_unlock(&ctlr->lock);
 766
 767         fcoe_ctlr_device_flush_work(ctlr);
 768
 769         destroy_workqueue(ctlr->devloss_work_q);
 770         ctlr->devloss_work_q = NULL;
 771         destroy_workqueue(ctlr->work_q);
 772         ctlr->work_q = NULL;
 773
 774         device_unregister(&ctlr->dev);
 775 }
 776 EXPORT_SYMBOL_GPL(fcoe_ctlr_device_delete);
 777
 778 /**
 779  * fcoe_fcf_device_final_delete() - Final delete routine
 780  * @work: The FIP fcf's embedded work struct
 781  *
 782  * It is expected that the fcf has been removed from
 783  * the FIP ctlr's list before calling this routine.
 784  */
 785 static void fcoe_fcf_device_final_delete(struct work_struct *work)
 786 {
 787         struct fcoe_fcf_device *fcf =
 788                 container_of(work, struct fcoe_fcf_device, delete_work);
 789         struct fcoe_ctlr_device *ctlr = fcoe_fcf_dev_to_ctlr_dev(fcf);
 790
 791         /*
 792          * Cancel any outstanding timers. These should really exist
 793          * only when rmmod'ing the LLDD and we're asking for
 794          * immediate termination of the rports
 795          */
 796         if (!cancel_delayed_work(&fcf->dev_loss_work))
 797                 fcoe_ctlr_device_flush_devloss(ctlr);
 798
 799         device_unregister(&fcf->dev);
 800 }
 801
 802 /**
 803  * fip_timeout_deleted_fcf() - Delete a fcf when the devloss timer fires
 804  * @work: The FIP fcf's embedded work struct
 805  *
 806  * Removes the fcf from the FIP ctlr's list of fcfs and
 807  * queues the final deletion.
 808  */
 809 static void fip_timeout_deleted_fcf(struct work_struct *work)
 810 {
 811         struct fcoe_fcf_device *fcf =
 812                 container_of(work, struct fcoe_fcf_device, dev_loss_work.work);
 813         struct fcoe_ctlr_device *ctlr = fcoe_fcf_dev_to_ctlr_dev(fcf);
 814
 815         mutex_lock(&ctlr->lock);
 816
 817         /*
 818          * If the fcf is deleted or reconnected before the timer
 819          * fires the devloss queue will be flushed, but the state will
 820          * either be CONNECTED or DELETED. If that is the case we
 821          * cancel deleting the fcf.
 822          */
 823         if (fcf->state != FCOE_FCF_STATE_DISCONNECTED)
 824                 goto out;
 825
 826         dev_printk(KERN_ERR, &fcf->dev,
 827                    "FIP fcf connection time out: removing fcf\n");
 828
 829         list_del(&fcf->peers);
 830         fcf->state = FCOE_FCF_STATE_DELETED;
 831         fcoe_ctlr_device_queue_work(ctlr, &fcf->delete_work);
 832
 833 out:
 834         mutex_unlock(&ctlr->lock);
 835 }
 836
 837 /**
 838  * fcoe_fcf_device_delete() - Delete a FIP fcf
 839  * @fcf: Pointer to the fcf which is to be deleted
 840  *
 841  * Queues the FIP fcf on the devloss workqueue
 842  *
 843  * Expects the ctlr_attrs mutex to be held for fcf
 844  * state change.
 845  */
 846 void fcoe_fcf_device_delete(struct fcoe_fcf_device *fcf)
 847 {
 848         struct fcoe_ctlr_device *ctlr = fcoe_fcf_dev_to_ctlr_dev(fcf);
 849         int timeout = fcf->dev_loss_tmo;
 850
 851         if (fcf->state != FCOE_FCF_STATE_CONNECTED)
 852                 return;
 853
 854         fcf->state = FCOE_FCF_STATE_DISCONNECTED;
 855
 856         /*
 857          * FCF will only be re-connected by the LLD calling
 858          * fcoe_fcf_device_add, and it should be setting up
 859          * priv then.
 860          */
 861         fcf->priv = NULL;
 862
 863         fcoe_ctlr_device_queue_devloss_work(ctlr, &fcf->dev_loss_work,
 864                                            timeout * HZ);
 865 }
 866 EXPORT_SYMBOL_GPL(fcoe_fcf_device_delete);
 867
 868 /**
 869  * fcoe_fcf_device_add() - Add a FCoE sysfs fcoe_fcf_device to the system
 870  * @ctlr:    The fcoe_ctlr_device that will be the fcoe_fcf_device parent
 871  * @new_fcf: A temporary FCF used for lookups on the current list of fcfs
 872  *
 873  * Expects to be called with the ctlr->lock held
 874  */
 875 struct fcoe_fcf_device *fcoe_fcf_device_add(struct fcoe_ctlr_device *ctlr,
 876                                             struct fcoe_fcf_device *new_fcf)
 877 {
 878         struct fcoe_fcf_device *fcf;
 879         int error = 0;
 880
 881         list_for_each_entry(fcf, &ctlr->fcfs, peers) {
 882                 if (fcoe_fcf_device_match(new_fcf, fcf)) {
 883                         if (fcf->state == FCOE_FCF_STATE_CONNECTED)
 884                                 return fcf;
 885
 886                         fcf->state = FCOE_FCF_STATE_CONNECTED;
 887
 888                         if (!cancel_delayed_work(&fcf->dev_loss_work))
 889                                 fcoe_ctlr_device_flush_devloss(ctlr);
 890
 891                         return fcf;
 892                 }
 893         }
 894
 895         fcf = kzalloc(sizeof(struct fcoe_fcf_device), GFP_ATOMIC);
 896         if (unlikely(!fcf))
 897                 goto out;
 898
 899         INIT_WORK(&fcf->delete_work, fcoe_fcf_device_final_delete);
 900         INIT_DELAYED_WORK(&fcf->dev_loss_work, fip_timeout_deleted_fcf);
 901
 902         fcf->dev.parent = &ctlr->dev;
 903         fcf->dev.bus = &fcoe_bus_type;
 904         fcf->dev.type = &fcoe_fcf_device_type;
 905         fcf->id = atomic_inc_return(&fcf_num) - 1;
 906         fcf->state = FCOE_FCF_STATE_UNKNOWN;
 907
 908         fcf->dev_loss_tmo = ctlr->fcf_dev_loss_tmo;
 909
 910         dev_set_name(&fcf->dev, "fcf_%d", fcf->id);
 911
 912         fcf->fabric_name = new_fcf->fabric_name;
 913         fcf->switch_name = new_fcf->switch_name;
 914         fcf->fc_map = new_fcf->fc_map;
 915         fcf->vfid = new_fcf->vfid;
 916         memcpy(fcf->mac, new_fcf->mac, ETH_ALEN);
 917         fcf->priority = new_fcf->priority;
 918         fcf->fka_period = new_fcf->fka_period;
 919         fcf->selected = new_fcf->selected;
 920
 921         error = device_register(&fcf->dev);
 922         if (error)
 923                 goto out_del;
 924
 925         fcf->state = FCOE_FCF_STATE_CONNECTED;
 926         list_add_tail(&fcf->peers, &ctlr->fcfs);
 927
 928         return fcf;
 929
 930 out_del:
 931         kfree(fcf);
 932 out:
 933         return NULL;
 934 }
 935 EXPORT_SYMBOL_GPL(fcoe_fcf_device_add);
 936
 937 int __init fcoe_sysfs_setup(void)
 938 {
 939         int error;
 940
 941         atomic_set(&ctlr_num, 0);
 942         atomic_set(&fcf_num, 0);
 943
 944         error = bus_register(&fcoe_bus_type);
 945         if (error)
 946                 return error;
 947
 948         return 0;
 949 }
 950
 951 void __exit fcoe_sysfs_teardown(void)
 952 {
 953         bus_unregister(&fcoe_bus_type);
 954 }