include/scsi/scsi_transport_fc.h

   1 /*
   2  *  FiberChannel transport specific attributes exported to sysfs.
   3  *
   4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  *  ========
  21  *
  22  *  Copyright (C) 2004-2005   James Smart, Emulex Corporation
  23  *    Rewrite for host, target, device, and remote port attributes,
  24  *    statistics, and service functions...
  25  *
  26  */
  27 #ifndef SCSI_TRANSPORT_FC_H
  28 #define SCSI_TRANSPORT_FC_H
  29
  30 #include <linux/sched.h>
  31 #include <scsi/scsi.h>
  32
  33 struct scsi_transport_template;
  34
  35
  36 /*
  37  * FC Port definitions - Following FC HBAAPI guidelines
  38  *
  39  * Note: Not all binary values for the different fields match HBAAPI.
  40  *  Instead, we use densely packed ordinal values or enums.
  41  *  We get away with this as we never present the actual binary values
  42  *  externally. For sysfs, we always present the string that describes
  43  *  the value. Thus, an admin doesn't need a magic HBAAPI decoder ring
  44  *  to understand the values. The HBAAPI user-space library is free to
  45  *  convert the strings into the HBAAPI-specified binary values.
  46  *
  47  * Note: Not all HBAAPI-defined values are contained in the definitions
  48  *  below. Those not appropriate to an fc_host (e.g. FCP initiator) have
  49  *  been removed.
  50  */
  51
  52 /*
  53  * fc_port_type: If you alter this, you also need to alter scsi_transport_fc.c
  54  * (for the ascii descriptions).
  55  */
  56 enum fc_port_type {
  57         FC_PORTTYPE_UNKNOWN,
  58         FC_PORTTYPE_OTHER,
  59         FC_PORTTYPE_NOTPRESENT,
  60         FC_PORTTYPE_NPORT,              /* Attached to FPort */
  61         FC_PORTTYPE_NLPORT,             /* (Public) Loop w/ FLPort */
  62         FC_PORTTYPE_LPORT,              /* (Private) Loop w/o FLPort */
  63         FC_PORTTYPE_PTP,                /* Point to Point w/ another NPort */
  64 };
  65
  66 /*
  67  * fc_port_state: If you alter this, you also need to alter scsi_transport_fc.c
  68  * (for the ascii descriptions).
  69  */
  70 enum fc_port_state {
  71         FC_PORTSTATE_UNKNOWN,
  72         FC_PORTSTATE_NOTPRESENT,
  73         FC_PORTSTATE_ONLINE,
  74         FC_PORTSTATE_OFFLINE,           /* User has taken Port Offline */
  75         FC_PORTSTATE_BLOCKED,
  76         FC_PORTSTATE_BYPASSED,
  77         FC_PORTSTATE_DIAGNOSTICS,
  78         FC_PORTSTATE_LINKDOWN,
  79         FC_PORTSTATE_ERROR,
  80         FC_PORTSTATE_LOOPBACK,
  81         FC_PORTSTATE_DELETED,
  82 };
  83
  84
  85 /*
  86  * FC Classes of Service
  87  * Note: values are not enumerated, as they can be "or'd" together
  88  * for reporting (e.g. report supported_classes). If you alter this list,
  89  * you also need to alter scsi_transport_fc.c (for the ascii descriptions).
  90  */
  91 #define FC_COS_UNSPECIFIED              0
  92 #define FC_COS_CLASS1                   2
  93 #define FC_COS_CLASS2                   4
  94 #define FC_COS_CLASS3                   8
  95 #define FC_COS_CLASS4                   0x10
  96 #define FC_COS_CLASS6                   0x40
  97
  98 /*
  99  * FC Port Speeds
 100  * Note: values are not enumerated, as they can be "or'd" together
 101  * for reporting (e.g. report supported_speeds). If you alter this list,
 102  * you also need to alter scsi_transport_fc.c (for the ascii descriptions).
 103  */
 104 #define FC_PORTSPEED_UNKNOWN            0 /* Unknown - transceiver
 105                                              incapable of reporting */
 106 #define FC_PORTSPEED_1GBIT              1
 107 #define FC_PORTSPEED_2GBIT              2
 108 #define FC_PORTSPEED_4GBIT              4
 109 #define FC_PORTSPEED_10GBIT             8
 110 #define FC_PORTSPEED_NOT_NEGOTIATED     (1 << 15) /* Speed not established */
 111
 112 /*
 113  * fc_tgtid_binding_type: If you alter this, you also need to alter
 114  * scsi_transport_fc.c (for the ascii descriptions).
 115  */
 116 enum fc_tgtid_binding_type  {
 117         FC_TGTID_BIND_NONE,
 118         FC_TGTID_BIND_BY_WWPN,
 119         FC_TGTID_BIND_BY_WWNN,
 120         FC_TGTID_BIND_BY_ID,
 121 };
 122
 123 /*
 124  * FC Remote Port Roles
 125  * Note: values are not enumerated, as they can be "or'd" together
 126  * for reporting (e.g. report roles). If you alter this list,
 127  * you also need to alter scsi_transport_fc.c (for the ascii descriptions).
 128  */
 129 #define FC_RPORT_ROLE_UNKNOWN                   0x00
 130 #define FC_RPORT_ROLE_FCP_TARGET                0x01
 131 #define FC_RPORT_ROLE_FCP_INITIATOR             0x02
 132 #define FC_RPORT_ROLE_IP_PORT                   0x04
 133
 134
 135 /*
 136  * fc_rport_identifiers: This set of data contains all elements
 137  * to uniquely identify a remote FC port. The driver uses this data
 138  * to report the existence of a remote FC port in the topology. Internally,
 139  * the transport uses this data for attributes and to manage consistent
 140  * target id bindings.
 141  */
 142 struct fc_rport_identifiers {
 143         u64 node_name;
 144         u64 port_name;
 145         u32 port_id;
 146         u32 roles;
 147 };
 148
 149 /* Macro for use in defining Remote Port attributes */
 150 #define FC_RPORT_ATTR(_name,_mode,_show,_store)                         \
 151 struct class_device_attribute class_device_attr_rport_##_name =         \
 152         __ATTR(_name,_mode,_show,_store)
 153
 154
 155 /*
 156  * FC Remote Port Attributes
 157  *
 158  * This structure exists for each remote FC port that a LLDD notifies
 159  * the subsystem of.  A remote FC port may or may not be a SCSI Target,
 160  * also be a SCSI initiator, IP endpoint, etc. As such, the remote
 161  * port is considered a separate entity, independent of "role" (such
 162  * as scsi target).
 163  *
 164  * --
 165  *
 166  * Attributes are based on HBAAPI V2.0 definitions. Only those
 167  * attributes that are determinable by the local port (aka Host)
 168  * are contained.
 169  *
 170  * Fixed attributes are not expected to change. The driver is
 171  * expected to set these values after successfully calling
 172  * fc_remote_port_add(). The transport fully manages all get functions
 173  * w/o driver interaction.
 174  *
 175  * Dynamic attributes are expected to change. The driver participates
 176  * in all get/set operations via functions provided by the driver.
 177  *
 178  * Private attributes are transport-managed values. They are fully
 179  * managed by the transport w/o driver interaction.
 180  */
 181
 182 struct fc_rport {       /* aka fc_starget_attrs */
 183         /* Fixed Attributes */
 184         u32 maxframe_size;
 185         u32 supported_classes;
 186
 187         /* Dynamic Attributes */
 188         u32 dev_loss_tmo;       /* Remote Port loss timeout in seconds. */
 189
 190         /* Private (Transport-managed) Attributes */
 191         u64 node_name;
 192         u64 port_name;
 193         u32 port_id;
 194         u32 roles;
 195         enum fc_port_state port_state;  /* Will only be ONLINE or UNKNOWN */
 196         u32 scsi_target_id;
 197
 198         /* exported data */
 199         void *dd_data;                  /* Used for driver-specific storage */
 200
 201         /* internal data */
 202         unsigned int channel;
 203         u32 number;
 204         u8 flags;
 205         struct list_head peers;
 206         struct device dev;
 207         struct work_struct dev_loss_work;
 208         struct work_struct scan_work;
 209         struct work_struct stgt_delete_work;
 210         struct work_struct rport_delete_work;
 211 } __attribute__((aligned(sizeof(unsigned long))));
 212
 213 /* bit field values for struct fc_rport "flags" field: */
 214 #define FC_RPORT_DEVLOSS_PENDING        0x01
 215 #define FC_RPORT_SCAN_PENDING           0x02
 216
 217 #define dev_to_rport(d)                         \
 218         container_of(d, struct fc_rport, dev)
 219 #define transport_class_to_rport(classdev)      \
 220         dev_to_rport(classdev->dev)
 221 #define rport_to_shost(r)                       \
 222         dev_to_shost(r->dev.parent)
 223
 224 /*
 225  * FC SCSI Target Attributes
 226  *
 227  * The SCSI Target is considered an extention of a remote port (as
 228  * a remote port can be more than a SCSI Target). Within the scsi
 229  * subsystem, we leave the Target as a separate entity. Doing so
 230  * provides backward compatibility with prior FC transport api's,
 231  * and lets remote ports be handled entirely within the FC transport
 232  * and independently from the scsi subsystem. The drawback is that
 233  * some data will be duplicated.
 234  */
 235
 236 struct fc_starget_attrs {       /* aka fc_target_attrs */
 237         /* Dynamic Attributes */
 238         u64 node_name;
 239         u64 port_name;
 240         u32 port_id;
 241 };
 242
 243 #define fc_starget_node_name(x) \
 244         (((struct fc_starget_attrs *)&(x)->starget_data)->node_name)
 245 #define fc_starget_port_name(x) \
 246         (((struct fc_starget_attrs *)&(x)->starget_data)->port_name)
 247 #define fc_starget_port_id(x) \
 248         (((struct fc_starget_attrs *)&(x)->starget_data)->port_id)
 249
 250 #define starget_to_rport(s)                     \
 251         scsi_is_fc_rport(s->dev.parent) ? dev_to_rport(s->dev.parent) : NULL
 252
 253
 254 /*
 255  * FC Local Port (Host) Statistics
 256  */
 257
 258 /* FC Statistics - Following FC HBAAPI v2.0 guidelines */
 259 struct fc_host_statistics {
 260         /* port statistics */
 261         u64 seconds_since_last_reset;
 262         u64 tx_frames;
 263         u64 tx_words;
 264         u64 rx_frames;
 265         u64 rx_words;
 266         u64 lip_count;
 267         u64 nos_count;
 268         u64 error_frames;
 269         u64 dumped_frames;
 270         u64 link_failure_count;
 271         u64 loss_of_sync_count;
 272         u64 loss_of_signal_count;
 273         u64 prim_seq_protocol_err_count;
 274         u64 invalid_tx_word_count;
 275         u64 invalid_crc_count;
 276
 277         /* fc4 statistics  (only FCP supported currently) */
 278         u64 fcp_input_requests;
 279         u64 fcp_output_requests;
 280         u64 fcp_control_requests;
 281         u64 fcp_input_megabytes;
 282         u64 fcp_output_megabytes;
 283 };
 284
 285
 286 /*
 287  * FC Local Port (Host) Attributes
 288  *
 289  * Attributes are based on HBAAPI V2.0 definitions.
 290  * Note: OSDeviceName is determined by user-space library
 291  *
 292  * Fixed attributes are not expected to change. The driver is
 293  * expected to set these values after successfully calling scsi_add_host().
 294  * The transport fully manages all get functions w/o driver interaction.
 295  *
 296  * Dynamic attributes are expected to change. The driver participates
 297  * in all get/set operations via functions provided by the driver.
 298  *
 299  * Private attributes are transport-managed values. They are fully
 300  * managed by the transport w/o driver interaction.
 301  */
 302
 303 #define FC_FC4_LIST_SIZE                32
 304 #define FC_SYMBOLIC_NAME_SIZE           256
 305 #define FC_VERSION_STRING_SIZE          64
 306 #define FC_SERIAL_NUMBER_SIZE           80
 307
 308 struct fc_host_attrs {
 309         /* Fixed Attributes */
 310         u64 node_name;
 311         u64 port_name;
 312         u64 permanent_port_name;
 313         u32 supported_classes;
 314         u8  supported_fc4s[FC_FC4_LIST_SIZE];
 315         char symbolic_name[FC_SYMBOLIC_NAME_SIZE];
 316         u32 supported_speeds;
 317         u32 maxframe_size;
 318         char serial_number[FC_SERIAL_NUMBER_SIZE];
 319
 320         /* Dynamic Attributes */
 321         u32 port_id;
 322         enum fc_port_type port_type;
 323         enum fc_port_state port_state;
 324         u8  active_fc4s[FC_FC4_LIST_SIZE];
 325         u32 speed;
 326         u64 fabric_name;
 327
 328         /* Private (Transport-managed) Attributes */
 329         enum fc_tgtid_binding_type  tgtid_bind_type;
 330
 331         /* internal data */
 332         struct list_head rports;
 333         struct list_head rport_bindings;
 334         u32 next_rport_number;
 335         u32 next_target_id;
 336
 337         /* work queues for rport state manipulation */
 338         char work_q_name[KOBJ_NAME_LEN];
 339         struct workqueue_struct *work_q;
 340         char devloss_work_q_name[KOBJ_NAME_LEN];
 341         struct workqueue_struct *devloss_work_q;
 342 };
 343
 344 #define shost_to_fc_host(x) \
 345         ((struct fc_host_attrs *)(x)->shost_data)
 346
 347 #define fc_host_node_name(x) \
 348         (((struct fc_host_attrs *)(x)->shost_data)->node_name)
 349 #define fc_host_port_name(x)    \
 350         (((struct fc_host_attrs *)(x)->shost_data)->port_name)
 351 #define fc_host_permanent_port_name(x)  \
 352         (((struct fc_host_attrs *)(x)->shost_data)->permanent_port_name)
 353 #define fc_host_supported_classes(x)    \
 354         (((struct fc_host_attrs *)(x)->shost_data)->supported_classes)
 355 #define fc_host_supported_fc4s(x)       \
 356         (((struct fc_host_attrs *)(x)->shost_data)->supported_fc4s)
 357 #define fc_host_symbolic_name(x)        \
 358         (((struct fc_host_attrs *)(x)->shost_data)->symbolic_name)
 359 #define fc_host_supported_speeds(x)     \
 360         (((struct fc_host_attrs *)(x)->shost_data)->supported_speeds)
 361 #define fc_host_maxframe_size(x)        \
 362         (((struct fc_host_attrs *)(x)->shost_data)->maxframe_size)
 363 #define fc_host_serial_number(x)        \
 364         (((struct fc_host_attrs *)(x)->shost_data)->serial_number)
 365 #define fc_host_port_id(x)      \
 366         (((struct fc_host_attrs *)(x)->shost_data)->port_id)
 367 #define fc_host_port_type(x)    \
 368         (((struct fc_host_attrs *)(x)->shost_data)->port_type)
 369 #define fc_host_port_state(x)   \
 370         (((struct fc_host_attrs *)(x)->shost_data)->port_state)
 371 #define fc_host_active_fc4s(x)  \
 372         (((struct fc_host_attrs *)(x)->shost_data)->active_fc4s)
 373 #define fc_host_speed(x)        \
 374         (((struct fc_host_attrs *)(x)->shost_data)->speed)
 375 #define fc_host_fabric_name(x)  \
 376         (((struct fc_host_attrs *)(x)->shost_data)->fabric_name)
 377 #define fc_host_tgtid_bind_type(x) \
 378         (((struct fc_host_attrs *)(x)->shost_data)->tgtid_bind_type)
 379 #define fc_host_rports(x) \
 380         (((struct fc_host_attrs *)(x)->shost_data)->rports)
 381 #define fc_host_rport_bindings(x) \
 382         (((struct fc_host_attrs *)(x)->shost_data)->rport_bindings)
 383 #define fc_host_next_rport_number(x) \
 384         (((struct fc_host_attrs *)(x)->shost_data)->next_rport_number)
 385 #define fc_host_next_target_id(x) \
 386         (((struct fc_host_attrs *)(x)->shost_data)->next_target_id)
 387 #define fc_host_work_q_name(x) \
 388         (((struct fc_host_attrs *)(x)->shost_data)->work_q_name)
 389 #define fc_host_work_q(x) \
 390         (((struct fc_host_attrs *)(x)->shost_data)->work_q)
 391 #define fc_host_devloss_work_q_name(x) \
 392         (((struct fc_host_attrs *)(x)->shost_data)->devloss_work_q_name)
 393 #define fc_host_devloss_work_q(x) \
 394         (((struct fc_host_attrs *)(x)->shost_data)->devloss_work_q)
 395
 396
 397 /* The functions by which the transport class and the driver communicate */
 398 struct fc_function_template {
 399         void    (*get_rport_dev_loss_tmo)(struct fc_rport *);
 400         void    (*set_rport_dev_loss_tmo)(struct fc_rport *, u32);
 401
 402         void    (*get_starget_node_name)(struct scsi_target *);
 403         void    (*get_starget_port_name)(struct scsi_target *);
 404         void    (*get_starget_port_id)(struct scsi_target *);
 405
 406         void    (*get_host_port_id)(struct Scsi_Host *);
 407         void    (*get_host_port_type)(struct Scsi_Host *);
 408         void    (*get_host_port_state)(struct Scsi_Host *);
 409         void    (*get_host_active_fc4s)(struct Scsi_Host *);
 410         void    (*get_host_speed)(struct Scsi_Host *);
 411         void    (*get_host_fabric_name)(struct Scsi_Host *);
 412
 413         struct fc_host_statistics * (*get_fc_host_stats)(struct Scsi_Host *);
 414         void    (*reset_fc_host_stats)(struct Scsi_Host *);
 415
 416         int     (*issue_fc_host_lip)(struct Scsi_Host *);
 417
 418         /* allocation lengths for host-specific data */
 419         u32                             dd_fcrport_size;
 420
 421         /*
 422          * The driver sets these to tell the transport class it
 423          * wants the attributes displayed in sysfs.  If the show_ flag
 424          * is not set, the attribute will be private to the transport
 425          * class
 426          */
 427
 428         /* remote port fixed attributes */
 429         unsigned long   show_rport_maxframe_size:1;
 430         unsigned long   show_rport_supported_classes:1;
 431         unsigned long   show_rport_dev_loss_tmo:1;
 432
 433         /*
 434          * target dynamic attributes
 435          * These should all be "1" if the driver uses the remote port
 436          * add/delete functions (so attributes reflect rport values).
 437          */
 438         unsigned long   show_starget_node_name:1;
 439         unsigned long   show_starget_port_name:1;
 440         unsigned long   show_starget_port_id:1;
 441
 442         /* host fixed attributes */
 443         unsigned long   show_host_node_name:1;
 444         unsigned long   show_host_port_name:1;
 445         unsigned long   show_host_permanent_port_name:1;
 446         unsigned long   show_host_supported_classes:1;
 447         unsigned long   show_host_supported_fc4s:1;
 448         unsigned long   show_host_symbolic_name:1;
 449         unsigned long   show_host_supported_speeds:1;
 450         unsigned long   show_host_maxframe_size:1;
 451         unsigned long   show_host_serial_number:1;
 452         /* host dynamic attributes */
 453         unsigned long   show_host_port_id:1;
 454         unsigned long   show_host_port_type:1;
 455         unsigned long   show_host_port_state:1;
 456         unsigned long   show_host_active_fc4s:1;
 457         unsigned long   show_host_speed:1;
 458         unsigned long   show_host_fabric_name:1;
 459 };
 460
 461
 462 /**
 463  * fc_remote_port_chkready - called to validate the remote port state
 464  *   prior to initiating io to the port.
 465  *
 466  * Returns a scsi result code that can be returned by the LLDD.
 467  *
 468  * @rport:      remote port to be checked
 469  **/
 470 static inline int
 471 fc_remote_port_chkready(struct fc_rport *rport)
 472 {
 473         int result;
 474
 475         switch (rport->port_state) {
 476         case FC_PORTSTATE_ONLINE:
 477                 if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
 478                         result = 0;
 479                 else if (rport->flags & FC_RPORT_DEVLOSS_PENDING)
 480                         result = DID_IMM_RETRY << 16;
 481                 else
 482                         result = DID_NO_CONNECT << 16;
 483                 break;
 484         case FC_PORTSTATE_BLOCKED:
 485                 result = DID_IMM_RETRY << 16;
 486                 break;
 487         default:
 488                 result = DID_NO_CONNECT << 16;
 489                 break;
 490         }
 491         return result;
 492 }
 493
 494
 495 struct scsi_transport_template *fc_attach_transport(
 496                         struct fc_function_template *);
 497 void fc_release_transport(struct scsi_transport_template *);
 498 void fc_remove_host(struct Scsi_Host *);
 499 struct fc_rport *fc_remote_port_add(struct Scsi_Host *shost,
 500                         int channel, struct fc_rport_identifiers  *ids);
 501 void fc_remote_port_delete(struct fc_rport  *rport);
 502 void fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles);
 503 int scsi_is_fc_rport(const struct device *);
 504
 505 static inline u64 wwn_to_u64(u8 *wwn)
 506 {
 507         return (u64)wwn[0] << 56 | (u64)wwn[1] << 48 |
 508             (u64)wwn[2] << 40 | (u64)wwn[3] << 32 |
 509             (u64)wwn[4] << 24 | (u64)wwn[5] << 16 |
 510             (u64)wwn[6] <<  8 | (u64)wwn[7];
 511 }
 512
 513 #endif /* SCSI_TRANSPORT_FC_H */