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 store_ctlr_fip_resp(struct device *dev,
 389                               struct device_attribute *attr,
 390                               const char *buf, size_t count)
 391 {
 392         struct fcoe_ctlr_device *ctlr = dev_to_ctlr(dev);
 393         struct fcoe_ctlr *fip = fcoe_ctlr_device_priv(ctlr);
 394
 395         mutex_lock(&fip->ctlr_mutex);
 396         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 397                 if (buf[0] == '1') {
 398                         fip->fip_resp = 1;
 399                         mutex_unlock(&fip->ctlr_mutex);
 400                         return count;
 401                 }
 402                 if (buf[0] == '0') {
 403                         fip->fip_resp = 0;
 404                         mutex_unlock(&fip->ctlr_mutex);
 405                         return count;
 406                 }
 407         }
 408         mutex_unlock(&fip->ctlr_mutex);
 409         return -EINVAL;
 410 }
 411
 412 static ssize_t show_ctlr_fip_resp(struct device *dev,
 413                                   struct device_attribute *attr,
 414                                   char *buf)
 415 {
 416         struct fcoe_ctlr_device *ctlr = dev_to_ctlr(dev);
 417         struct fcoe_ctlr *fip = fcoe_ctlr_device_priv(ctlr);
 418
 419         return sprintf(buf, "%d\n", fip->fip_resp ? 1 : 0);
 420 }
 421
 422 static FCOE_DEVICE_ATTR(ctlr, fip_vlan_responder, S_IRUGO | S_IWUSR,
 423                         show_ctlr_fip_resp,
 424                         store_ctlr_fip_resp);
 425
 426 static ssize_t
 427 store_private_fcoe_ctlr_fcf_dev_loss_tmo(struct device *dev,
 428                                          struct device_attribute *attr,
 429                                          const char *buf, size_t count)
 430 {
 431         struct fcoe_ctlr_device *ctlr = dev_to_ctlr(dev);
 432         struct fcoe_fcf_device *fcf;
 433         unsigned long val;
 434         int rc;
 435
 436         rc = fcoe_str_to_dev_loss(buf, &val);
 437         if (rc)
 438                 return rc;
 439
 440         fcoe_ctlr_fcf_dev_loss_tmo(ctlr) = val;
 441         mutex_lock(&ctlr->lock);
 442         list_for_each_entry(fcf, &ctlr->fcfs, peers)
 443                 fcoe_fcf_set_dev_loss_tmo(fcf, val);
 444         mutex_unlock(&ctlr->lock);
 445         return count;
 446 }
 447 fcoe_ctlr_private_show_function(fcf_dev_loss_tmo, "%d\n", 20, );
 448 static FCOE_DEVICE_ATTR(ctlr, fcf_dev_loss_tmo, S_IRUGO | S_IWUSR,
 449                         show_fcoe_ctlr_device_fcf_dev_loss_tmo,
 450                         store_private_fcoe_ctlr_fcf_dev_loss_tmo);
 451
 452 /* Link Error Status Block (LESB) */
 453 fcoe_ctlr_rd_attr(link_fail, "%u\n", 20);
 454 fcoe_ctlr_rd_attr(vlink_fail, "%u\n", 20);
 455 fcoe_ctlr_rd_attr(miss_fka, "%u\n", 20);
 456 fcoe_ctlr_rd_attr(symb_err, "%u\n", 20);
 457 fcoe_ctlr_rd_attr(err_block, "%u\n", 20);
 458 fcoe_ctlr_rd_attr(fcs_error, "%u\n", 20);
 459
 460 fcoe_fcf_private_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
 461 fcoe_fcf_private_rd_attr_cast(switch_name, "0x%llx\n", 20, unsigned long long);
 462 fcoe_fcf_private_rd_attr(priority, "%u\n", 20);
 463 fcoe_fcf_private_rd_attr(fc_map, "0x%x\n", 20);
 464 fcoe_fcf_private_rd_attr(vfid, "%u\n", 20);
 465 fcoe_fcf_private_rd_attr(mac, "%pM\n", 20);
 466 fcoe_fcf_private_rd_attr(fka_period, "%u\n", 20);
 467 fcoe_fcf_rd_attr(selected, "%u\n", 20);
 468 fcoe_fcf_rd_attr(vlan_id, "%u\n", 20);
 469
 470 fcoe_fcf_private_show_function(dev_loss_tmo, "%d\n", 20, )
 471 static ssize_t
 472 store_fcoe_fcf_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
 473                             const char *buf, size_t count)
 474 {
 475         struct fcoe_fcf_device *fcf = dev_to_fcf(dev);
 476         unsigned long val;
 477         int rc;
 478
 479         rc = fcoe_str_to_dev_loss(buf, &val);
 480         if (rc)
 481                 return rc;
 482
 483         rc = fcoe_fcf_set_dev_loss_tmo(fcf, val);
 484         if (rc)
 485                 return rc;
 486         return count;
 487 }
 488 static FCOE_DEVICE_ATTR(fcf, dev_loss_tmo, S_IRUGO | S_IWUSR,
 489                         show_fcoe_fcf_device_dev_loss_tmo,
 490                         store_fcoe_fcf_dev_loss_tmo);
 491
 492 static struct attribute *fcoe_ctlr_lesb_attrs[] = {
 493         &device_attr_fcoe_ctlr_link_fail.attr,
 494         &device_attr_fcoe_ctlr_vlink_fail.attr,
 495         &device_attr_fcoe_ctlr_miss_fka.attr,
 496         &device_attr_fcoe_ctlr_symb_err.attr,
 497         &device_attr_fcoe_ctlr_err_block.attr,
 498         &device_attr_fcoe_ctlr_fcs_error.attr,
 499         NULL,
 500 };
 501
 502 static struct attribute_group fcoe_ctlr_lesb_attr_group = {
 503         .name = "lesb",
 504         .attrs = fcoe_ctlr_lesb_attrs,
 505 };
 506
 507 static struct attribute *fcoe_ctlr_attrs[] = {
 508         &device_attr_fcoe_ctlr_fip_vlan_responder.attr,
 509         &device_attr_fcoe_ctlr_fcf_dev_loss_tmo.attr,
 510         &device_attr_fcoe_ctlr_enabled.attr,
 511         &device_attr_fcoe_ctlr_mode.attr,
 512         NULL,
 513 };
 514
 515 static struct attribute_group fcoe_ctlr_attr_group = {
 516         .attrs = fcoe_ctlr_attrs,
 517 };
 518
 519 static const struct attribute_group *fcoe_ctlr_attr_groups[] = {
 520         &fcoe_ctlr_attr_group,
 521         &fcoe_ctlr_lesb_attr_group,
 522         NULL,
 523 };
 524
 525 static struct attribute *fcoe_fcf_attrs[] = {
 526         &device_attr_fcoe_fcf_fabric_name.attr,
 527         &device_attr_fcoe_fcf_switch_name.attr,
 528         &device_attr_fcoe_fcf_dev_loss_tmo.attr,
 529         &device_attr_fcoe_fcf_fc_map.attr,
 530         &device_attr_fcoe_fcf_vfid.attr,
 531         &device_attr_fcoe_fcf_mac.attr,
 532         &device_attr_fcoe_fcf_priority.attr,
 533         &device_attr_fcoe_fcf_fka_period.attr,
 534         &device_attr_fcoe_fcf_state.attr,
 535         &device_attr_fcoe_fcf_selected.attr,
 536         &device_attr_fcoe_fcf_vlan_id.attr,
 537         NULL
 538 };
 539
 540 static struct attribute_group fcoe_fcf_attr_group = {
 541         .attrs = fcoe_fcf_attrs,
 542 };
 543
 544 static const struct attribute_group *fcoe_fcf_attr_groups[] = {
 545         &fcoe_fcf_attr_group,
 546         NULL,
 547 };
 548
 549 static struct bus_type fcoe_bus_type;
 550
 551 static int fcoe_bus_match(struct device *dev,
 552                           struct device_driver *drv)
 553 {
 554         if (dev->bus == &fcoe_bus_type)
 555                 return 1;
 556         return 0;
 557 }
 558
 559 /**
 560  * fcoe_ctlr_device_release() - Release the FIP ctlr memory
 561  * @dev: Pointer to the FIP ctlr's embedded device
 562  *
 563  * Called when the last FIP ctlr reference is released.
 564  */
 565 static void fcoe_ctlr_device_release(struct device *dev)
 566 {
 567         struct fcoe_ctlr_device *ctlr = dev_to_ctlr(dev);
 568         kfree(ctlr);
 569 }
 570
 571 /**
 572  * fcoe_fcf_device_release() - Release the FIP fcf memory
 573  * @dev: Pointer to the fcf's embedded device
 574  *
 575  * Called when the last FIP fcf reference is released.
 576  */
 577 static void fcoe_fcf_device_release(struct device *dev)
 578 {
 579         struct fcoe_fcf_device *fcf = dev_to_fcf(dev);
 580         kfree(fcf);
 581 }
 582
 583 static struct device_type fcoe_ctlr_device_type = {
 584         .name = "fcoe_ctlr",
 585         .groups = fcoe_ctlr_attr_groups,
 586         .release = fcoe_ctlr_device_release,
 587 };
 588
 589 static struct device_type fcoe_fcf_device_type = {
 590         .name = "fcoe_fcf",
 591         .groups = fcoe_fcf_attr_groups,
 592         .release = fcoe_fcf_device_release,
 593 };
 594
 595 static BUS_ATTR(ctlr_create, S_IWUSR, NULL, fcoe_ctlr_create_store);
 596 static BUS_ATTR(ctlr_destroy, S_IWUSR, NULL, fcoe_ctlr_destroy_store);
 597
 598 static struct attribute *fcoe_bus_attrs[] = {
 599         &bus_attr_ctlr_create.attr,
 600         &bus_attr_ctlr_destroy.attr,
 601         NULL,
 602 };
 603 ATTRIBUTE_GROUPS(fcoe_bus);
 604
 605 static struct bus_type fcoe_bus_type = {
 606         .name = "fcoe",
 607         .match = &fcoe_bus_match,
 608         .bus_groups = fcoe_bus_groups,
 609 };
 610
 611 /**
 612  * fcoe_ctlr_device_flush_work() - Flush a FIP ctlr's workqueue
 613  * @ctlr: Pointer to the FIP ctlr whose workqueue is to be flushed
 614  */
 615 static void fcoe_ctlr_device_flush_work(struct fcoe_ctlr_device *ctlr)
 616 {
 617         if (!fcoe_ctlr_work_q(ctlr)) {
 618                 printk(KERN_ERR
 619                        "ERROR: FIP Ctlr '%d' attempted to flush work, "
 620                        "when no workqueue created.\n", ctlr->id);
 621                 dump_stack();
 622                 return;
 623         }
 624
 625         flush_workqueue(fcoe_ctlr_work_q(ctlr));
 626 }
 627
 628 /**
 629  * fcoe_ctlr_device_queue_work() - Schedule work for a FIP ctlr's workqueue
 630  * @ctlr: Pointer to the FIP ctlr who owns the devloss workqueue
 631  * @work:   Work to queue for execution
 632  *
 633  * Return value:
 634  *      1 on success / 0 already queued / < 0 for error
 635  */
 636 static int fcoe_ctlr_device_queue_work(struct fcoe_ctlr_device *ctlr,
 637                                        struct work_struct *work)
 638 {
 639         if (unlikely(!fcoe_ctlr_work_q(ctlr))) {
 640                 printk(KERN_ERR
 641                        "ERROR: FIP Ctlr '%d' attempted to queue work, "
 642                        "when no workqueue created.\n", ctlr->id);
 643                 dump_stack();
 644
 645                 return -EINVAL;
 646         }
 647
 648         return queue_work(fcoe_ctlr_work_q(ctlr), work);
 649 }
 650
 651 /**
 652  * fcoe_ctlr_device_flush_devloss() - Flush a FIP ctlr's devloss workqueue
 653  * @ctlr: Pointer to FIP ctlr whose workqueue is to be flushed
 654  */
 655 static void fcoe_ctlr_device_flush_devloss(struct fcoe_ctlr_device *ctlr)
 656 {
 657         if (!fcoe_ctlr_devloss_work_q(ctlr)) {
 658                 printk(KERN_ERR
 659                        "ERROR: FIP Ctlr '%d' attempted to flush work, "
 660                        "when no workqueue created.\n", ctlr->id);
 661                 dump_stack();
 662                 return;
 663         }
 664
 665         flush_workqueue(fcoe_ctlr_devloss_work_q(ctlr));
 666 }
 667
 668 /**
 669  * fcoe_ctlr_device_queue_devloss_work() - Schedule work for a FIP ctlr's devloss workqueue
 670  * @ctlr: Pointer to the FIP ctlr who owns the devloss workqueue
 671  * @work:   Work to queue for execution
 672  * @delay:  jiffies to delay the work queuing
 673  *
 674  * Return value:
 675  *      1 on success / 0 already queued / < 0 for error
 676  */
 677 static int fcoe_ctlr_device_queue_devloss_work(struct fcoe_ctlr_device *ctlr,
 678                                                struct delayed_work *work,
 679                                                unsigned long delay)
 680 {
 681         if (unlikely(!fcoe_ctlr_devloss_work_q(ctlr))) {
 682                 printk(KERN_ERR
 683                        "ERROR: FIP Ctlr '%d' attempted to queue work, "
 684                        "when no workqueue created.\n", ctlr->id);
 685                 dump_stack();
 686
 687                 return -EINVAL;
 688         }
 689
 690         return queue_delayed_work(fcoe_ctlr_devloss_work_q(ctlr), work, delay);
 691 }
 692
 693 static int fcoe_fcf_device_match(struct fcoe_fcf_device *new,
 694                                  struct fcoe_fcf_device *old)
 695 {
 696         if (new->switch_name == old->switch_name &&
 697             new->fabric_name == old->fabric_name &&
 698             new->fc_map == old->fc_map &&
 699             ether_addr_equal(new->mac, old->mac))
 700                 return 1;
 701         return 0;
 702 }
 703
 704 /**
 705  * fcoe_ctlr_device_add() - Add a FIP ctlr to sysfs
 706  * @parent:    The parent device to which the fcoe_ctlr instance
 707  *             should be attached
 708  * @f:         The LLD's FCoE sysfs function template pointer
 709  * @priv_size: Size to be allocated with the fcoe_ctlr_device for the LLD
 710  *
 711  * This routine allocates a FIP ctlr object with some additional memory
 712  * for the LLD. The FIP ctlr is initialized, added to sysfs and then
 713  * attributes are added to it.
 714  */
 715 struct fcoe_ctlr_device *fcoe_ctlr_device_add(struct device *parent,
 716                                     struct fcoe_sysfs_function_template *f,
 717                                     int priv_size)
 718 {
 719         struct fcoe_ctlr_device *ctlr;
 720         int error = 0;
 721
 722         ctlr = kzalloc(sizeof(struct fcoe_ctlr_device) + priv_size,
 723                        GFP_KERNEL);
 724         if (!ctlr)
 725                 goto out;
 726
 727         ctlr->id = atomic_inc_return(&ctlr_num) - 1;
 728         ctlr->f = f;
 729         ctlr->mode = FIP_CONN_TYPE_FABRIC;
 730         INIT_LIST_HEAD(&ctlr->fcfs);
 731         mutex_init(&ctlr->lock);
 732         ctlr->dev.parent = parent;
 733         ctlr->dev.bus = &fcoe_bus_type;
 734         ctlr->dev.type = &fcoe_ctlr_device_type;
 735
 736         ctlr->fcf_dev_loss_tmo = fcoe_fcf_dev_loss_tmo;
 737
 738         snprintf(ctlr->work_q_name, sizeof(ctlr->work_q_name),
 739                  "ctlr_wq_%d", ctlr->id);
 740         ctlr->work_q = create_singlethread_workqueue(
 741                 ctlr->work_q_name);
 742         if (!ctlr->work_q)
 743                 goto out_del;
 744
 745         snprintf(ctlr->devloss_work_q_name,
 746                  sizeof(ctlr->devloss_work_q_name),
 747                  "ctlr_dl_wq_%d", ctlr->id);
 748         ctlr->devloss_work_q = create_singlethread_workqueue(
 749                 ctlr->devloss_work_q_name);
 750         if (!ctlr->devloss_work_q)
 751                 goto out_del_q;
 752
 753         dev_set_name(&ctlr->dev, "ctlr_%d", ctlr->id);
 754         error = device_register(&ctlr->dev);
 755         if (error)
 756                 goto out_del_q2;
 757
 758         return ctlr;
 759
 760 out_del_q2:
 761         destroy_workqueue(ctlr->devloss_work_q);
 762         ctlr->devloss_work_q = NULL;
 763 out_del_q:
 764         destroy_workqueue(ctlr->work_q);
 765         ctlr->work_q = NULL;
 766 out_del:
 767         kfree(ctlr);
 768 out:
 769         return NULL;
 770 }
 771 EXPORT_SYMBOL_GPL(fcoe_ctlr_device_add);
 772
 773 /**
 774  * fcoe_ctlr_device_delete() - Delete a FIP ctlr and its subtree from sysfs
 775  * @ctlr: A pointer to the ctlr to be deleted
 776  *
 777  * Deletes a FIP ctlr and any fcfs attached
 778  * to it. Deleting fcfs will cause their childen
 779  * to be deleted as well.
 780  *
 781  * The ctlr is detached from sysfs and it's resources
 782  * are freed (work q), but the memory is not freed
 783  * until its last reference is released.
 784  *
 785  * This routine expects no locks to be held before
 786  * calling.
 787  *
 788  * TODO: Currently there are no callbacks to clean up LLD data
 789  * for a fcoe_fcf_device. LLDs must keep this in mind as they need
 790  * to clean up each of their LLD data for all fcoe_fcf_device before
 791  * calling fcoe_ctlr_device_delete.
 792  */
 793 void fcoe_ctlr_device_delete(struct fcoe_ctlr_device *ctlr)
 794 {
 795         struct fcoe_fcf_device *fcf, *next;
 796         /* Remove any attached fcfs */
 797         mutex_lock(&ctlr->lock);
 798         list_for_each_entry_safe(fcf, next,
 799                                  &ctlr->fcfs, peers) {
 800                 list_del(&fcf->peers);
 801                 fcf->state = FCOE_FCF_STATE_DELETED;
 802                 fcoe_ctlr_device_queue_work(ctlr, &fcf->delete_work);
 803         }
 804         mutex_unlock(&ctlr->lock);
 805
 806         fcoe_ctlr_device_flush_work(ctlr);
 807
 808         destroy_workqueue(ctlr->devloss_work_q);
 809         ctlr->devloss_work_q = NULL;
 810         destroy_workqueue(ctlr->work_q);
 811         ctlr->work_q = NULL;
 812
 813         device_unregister(&ctlr->dev);
 814 }
 815 EXPORT_SYMBOL_GPL(fcoe_ctlr_device_delete);
 816
 817 /**
 818  * fcoe_fcf_device_final_delete() - Final delete routine
 819  * @work: The FIP fcf's embedded work struct
 820  *
 821  * It is expected that the fcf has been removed from
 822  * the FIP ctlr's list before calling this routine.
 823  */
 824 static void fcoe_fcf_device_final_delete(struct work_struct *work)
 825 {
 826         struct fcoe_fcf_device *fcf =
 827                 container_of(work, struct fcoe_fcf_device, delete_work);
 828         struct fcoe_ctlr_device *ctlr = fcoe_fcf_dev_to_ctlr_dev(fcf);
 829
 830         /*
 831          * Cancel any outstanding timers. These should really exist
 832          * only when rmmod'ing the LLDD and we're asking for
 833          * immediate termination of the rports
 834          */
 835         if (!cancel_delayed_work(&fcf->dev_loss_work))
 836                 fcoe_ctlr_device_flush_devloss(ctlr);
 837
 838         device_unregister(&fcf->dev);
 839 }
 840
 841 /**
 842  * fip_timeout_deleted_fcf() - Delete a fcf when the devloss timer fires
 843  * @work: The FIP fcf's embedded work struct
 844  *
 845  * Removes the fcf from the FIP ctlr's list of fcfs and
 846  * queues the final deletion.
 847  */
 848 static void fip_timeout_deleted_fcf(struct work_struct *work)
 849 {
 850         struct fcoe_fcf_device *fcf =
 851                 container_of(work, struct fcoe_fcf_device, dev_loss_work.work);
 852         struct fcoe_ctlr_device *ctlr = fcoe_fcf_dev_to_ctlr_dev(fcf);
 853
 854         mutex_lock(&ctlr->lock);
 855
 856         /*
 857          * If the fcf is deleted or reconnected before the timer
 858          * fires the devloss queue will be flushed, but the state will
 859          * either be CONNECTED or DELETED. If that is the case we
 860          * cancel deleting the fcf.
 861          */
 862         if (fcf->state != FCOE_FCF_STATE_DISCONNECTED)
 863                 goto out;
 864
 865         dev_printk(KERN_ERR, &fcf->dev,
 866                    "FIP fcf connection time out: removing fcf\n");
 867
 868         list_del(&fcf->peers);
 869         fcf->state = FCOE_FCF_STATE_DELETED;
 870         fcoe_ctlr_device_queue_work(ctlr, &fcf->delete_work);
 871
 872 out:
 873         mutex_unlock(&ctlr->lock);
 874 }
 875
 876 /**
 877  * fcoe_fcf_device_delete() - Delete a FIP fcf
 878  * @fcf: Pointer to the fcf which is to be deleted
 879  *
 880  * Queues the FIP fcf on the devloss workqueue
 881  *
 882  * Expects the ctlr_attrs mutex to be held for fcf
 883  * state change.
 884  */
 885 void fcoe_fcf_device_delete(struct fcoe_fcf_device *fcf)
 886 {
 887         struct fcoe_ctlr_device *ctlr = fcoe_fcf_dev_to_ctlr_dev(fcf);
 888         int timeout = fcf->dev_loss_tmo;
 889
 890         if (fcf->state != FCOE_FCF_STATE_CONNECTED)
 891                 return;
 892
 893         fcf->state = FCOE_FCF_STATE_DISCONNECTED;
 894
 895         /*
 896          * FCF will only be re-connected by the LLD calling
 897          * fcoe_fcf_device_add, and it should be setting up
 898          * priv then.
 899          */
 900         fcf->priv = NULL;
 901
 902         fcoe_ctlr_device_queue_devloss_work(ctlr, &fcf->dev_loss_work,
 903                                            timeout * HZ);
 904 }
 905 EXPORT_SYMBOL_GPL(fcoe_fcf_device_delete);
 906
 907 /**
 908  * fcoe_fcf_device_add() - Add a FCoE sysfs fcoe_fcf_device to the system
 909  * @ctlr:    The fcoe_ctlr_device that will be the fcoe_fcf_device parent
 910  * @new_fcf: A temporary FCF used for lookups on the current list of fcfs
 911  *
 912  * Expects to be called with the ctlr->lock held
 913  */
 914 struct fcoe_fcf_device *fcoe_fcf_device_add(struct fcoe_ctlr_device *ctlr,
 915                                             struct fcoe_fcf_device *new_fcf)
 916 {
 917         struct fcoe_fcf_device *fcf;
 918         int error = 0;
 919
 920         list_for_each_entry(fcf, &ctlr->fcfs, peers) {
 921                 if (fcoe_fcf_device_match(new_fcf, fcf)) {
 922                         if (fcf->state == FCOE_FCF_STATE_CONNECTED)
 923                                 return fcf;
 924
 925                         fcf->state = FCOE_FCF_STATE_CONNECTED;
 926
 927                         if (!cancel_delayed_work(&fcf->dev_loss_work))
 928                                 fcoe_ctlr_device_flush_devloss(ctlr);
 929
 930                         return fcf;
 931                 }
 932         }
 933
 934         fcf = kzalloc(sizeof(struct fcoe_fcf_device), GFP_ATOMIC);
 935         if (unlikely(!fcf))
 936                 goto out;
 937
 938         INIT_WORK(&fcf->delete_work, fcoe_fcf_device_final_delete);
 939         INIT_DELAYED_WORK(&fcf->dev_loss_work, fip_timeout_deleted_fcf);
 940
 941         fcf->dev.parent = &ctlr->dev;
 942         fcf->dev.bus = &fcoe_bus_type;
 943         fcf->dev.type = &fcoe_fcf_device_type;
 944         fcf->id = atomic_inc_return(&fcf_num) - 1;
 945         fcf->state = FCOE_FCF_STATE_UNKNOWN;
 946
 947         fcf->dev_loss_tmo = ctlr->fcf_dev_loss_tmo;
 948
 949         dev_set_name(&fcf->dev, "fcf_%d", fcf->id);
 950
 951         fcf->fabric_name = new_fcf->fabric_name;
 952         fcf->switch_name = new_fcf->switch_name;
 953         fcf->fc_map = new_fcf->fc_map;
 954         fcf->vfid = new_fcf->vfid;
 955         memcpy(fcf->mac, new_fcf->mac, ETH_ALEN);
 956         fcf->priority = new_fcf->priority;
 957         fcf->fka_period = new_fcf->fka_period;
 958         fcf->selected = new_fcf->selected;
 959
 960         error = device_register(&fcf->dev);
 961         if (error)
 962                 goto out_del;
 963
 964         fcf->state = FCOE_FCF_STATE_CONNECTED;
 965         list_add_tail(&fcf->peers, &ctlr->fcfs);
 966
 967         return fcf;
 968
 969 out_del:
 970         kfree(fcf);
 971 out:
 972         return NULL;
 973 }
 974 EXPORT_SYMBOL_GPL(fcoe_fcf_device_add);
 975
 976 int __init fcoe_sysfs_setup(void)
 977 {
 978         int error;
 979
 980         atomic_set(&ctlr_num, 0);
 981         atomic_set(&fcf_num, 0);
 982
 983         error = bus_register(&fcoe_bus_type);
 984         if (error)
 985                 return error;
 986
 987         return 0;
 988 }
 989
 990 void __exit fcoe_sysfs_teardown(void)
 991 {
 992         bus_unregister(&fcoe_bus_type);
 993 }