include/scsi/libfc.h

   1 /*
   2  * Copyright(c) 2007 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 #ifndef _LIBFC_H_
  21 #define _LIBFC_H_
  22
  23 #include <linux/timer.h>
  24 #include <linux/if.h>
  25 #include <linux/percpu.h>
  26
  27 #include <scsi/scsi_transport.h>
  28 #include <scsi/scsi_transport_fc.h>
  29 #include <scsi/scsi_bsg_fc.h>
  30
  31 #include <scsi/fc/fc_fcp.h>
  32 #include <scsi/fc/fc_ns.h>
  33 #include <scsi/fc/fc_ms.h>
  34 #include <scsi/fc/fc_els.h>
  35 #include <scsi/fc/fc_gs.h>
  36
  37 #include <scsi/fc_frame.h>
  38
  39 #define FC_FC4_PROV_SIZE        (FC_TYPE_FCP + 1)       /* size of tables */
  40
  41 /*
  42  * libfc error codes
  43  */
  44 #define FC_NO_ERR       0       /* no error */
  45 #define FC_EX_TIMEOUT   1       /* Exchange timeout */
  46 #define FC_EX_CLOSED    2       /* Exchange closed */
  47
  48 /**
  49  * enum fc_lport_state - Local port states
  50  * @LPORT_ST_DISABLED: Disabled
  51  * @LPORT_ST_FLOGI:    Fabric login (FLOGI) sent
  52  * @LPORT_ST_DNS:      Waiting for name server remote port to become ready
  53  * @LPORT_ST_RPN_ID:   Register port name by ID (RPN_ID) sent
  54  * @LPORT_ST_RFT_ID:   Register Fibre Channel types by ID (RFT_ID) sent
  55  * @LPORT_ST_RFF_ID:   Register FC-4 Features by ID (RFF_ID) sent
  56  * @LPORT_ST_FDMI:     Waiting for mgmt server rport to become ready
  57  * @LPORT_ST_RHBA:
  58  * @LPORT_ST_SCR:      State Change Register (SCR) sent
  59  * @LPORT_ST_READY:    Ready for use
  60  * @LPORT_ST_LOGO:     Local port logout (LOGO) sent
  61  * @LPORT_ST_RESET:    Local port reset
  62  */
  63 enum fc_lport_state {
  64         LPORT_ST_DISABLED = 0,
  65         LPORT_ST_FLOGI,
  66         LPORT_ST_DNS,
  67         LPORT_ST_RNN_ID,
  68         LPORT_ST_RSNN_NN,
  69         LPORT_ST_RSPN_ID,
  70         LPORT_ST_RFT_ID,
  71         LPORT_ST_RFF_ID,
  72         LPORT_ST_FDMI,
  73         LPORT_ST_RHBA,
  74         LPORT_ST_RPA,
  75         LPORT_ST_DHBA,
  76         LPORT_ST_DPRT,
  77         LPORT_ST_SCR,
  78         LPORT_ST_READY,
  79         LPORT_ST_LOGO,
  80         LPORT_ST_RESET
  81 };
  82
  83 enum fc_disc_event {
  84         DISC_EV_NONE = 0,
  85         DISC_EV_SUCCESS,
  86         DISC_EV_FAILED
  87 };
  88
  89 /**
  90  * enum fc_rport_state - Remote port states
  91  * @RPORT_ST_INIT:    Initialized
  92  * @RPORT_ST_FLOGI:   Waiting for FLOGI completion for point-to-multipoint
  93  * @RPORT_ST_PLOGI_WAIT:   Waiting for peer to login for point-to-multipoint
  94  * @RPORT_ST_PLOGI:   Waiting for PLOGI completion
  95  * @RPORT_ST_PRLI:    Waiting for PRLI completion
  96  * @RPORT_ST_RTV:     Waiting for RTV completion
  97  * @RPORT_ST_READY:   Ready for use
  98  * @RPORT_ST_ADISC:   Discover Address sent
  99  * @RPORT_ST_DELETE:  Remote port being deleted
 100 */
 101 enum fc_rport_state {
 102         RPORT_ST_INIT,
 103         RPORT_ST_FLOGI,
 104         RPORT_ST_PLOGI_WAIT,
 105         RPORT_ST_PLOGI,
 106         RPORT_ST_PRLI,
 107         RPORT_ST_RTV,
 108         RPORT_ST_READY,
 109         RPORT_ST_ADISC,
 110         RPORT_ST_DELETE,
 111 };
 112
 113 /**
 114  * struct fc_disc_port - temporary discovery port to hold rport identifiers
 115  * @lp:         Fibre Channel host port instance
 116  * @peers:      Node for list management during discovery and RSCN processing
 117  * @rport_work: Work struct for starting the rport state machine
 118  * @port_id:    Port ID of the discovered port
 119  */
 120 struct fc_disc_port {
 121         struct fc_lport    *lp;
 122         struct list_head   peers;
 123         struct work_struct rport_work;
 124         u32                port_id;
 125 };
 126
 127 /**
 128  * enum fc_rport_event - Remote port events
 129  * @RPORT_EV_NONE:   No event
 130  * @RPORT_EV_READY:  Remote port is ready for use
 131  * @RPORT_EV_FAILED: State machine failed, remote port is not ready
 132  * @RPORT_EV_STOP:   Remote port has been stopped
 133  * @RPORT_EV_LOGO:   Remote port logout (LOGO) sent
 134  */
 135 enum fc_rport_event {
 136         RPORT_EV_NONE = 0,
 137         RPORT_EV_READY,
 138         RPORT_EV_FAILED,
 139         RPORT_EV_STOP,
 140         RPORT_EV_LOGO
 141 };
 142
 143 struct fc_rport_priv;
 144
 145 /**
 146  * struct fc_rport_operations - Operations for a remote port
 147  * @event_callback: Function to be called for remote port events
 148  */
 149 struct fc_rport_operations {
 150         void (*event_callback)(struct fc_lport *, struct fc_rport_priv *,
 151                                enum fc_rport_event);
 152 };
 153
 154 /**
 155  * struct fc_rport_libfc_priv - libfc internal information about a remote port
 156  * @local_port: The associated local port
 157  * @rp_state:   Indicates READY for I/O or DELETE when blocked
 158  * @flags:      REC and RETRY supported flags
 159  * @e_d_tov:    Error detect timeout value (in msec)
 160  * @r_a_tov:    Resource allocation timeout value (in msec)
 161  */
 162 struct fc_rport_libfc_priv {
 163         struct fc_lport            *local_port;
 164         enum fc_rport_state        rp_state;
 165         u16                        flags;
 166         #define FC_RP_FLAGS_REC_SUPPORTED       (1 << 0)
 167         #define FC_RP_FLAGS_RETRY               (1 << 1)
 168         #define FC_RP_STARTED                   (1 << 2)
 169         #define FC_RP_FLAGS_CONF_REQ            (1 << 3)
 170         unsigned int               e_d_tov;
 171         unsigned int               r_a_tov;
 172 };
 173
 174 /**
 175  * struct fc_rport_priv - libfc remote port and discovery info
 176  * @local_port:     The associated local port
 177  * @rport:          The FC transport remote port
 178  * @kref:           Reference counter
 179  * @rp_state:       Enumeration that tracks progress of PLOGI, PRLI,
 180  *                  and RTV exchanges
 181  * @ids:            The remote port identifiers and roles
 182  * @flags:          STARTED, REC and RETRY_SUPPORTED flags
 183  * @max_seq:        Maximum number of concurrent sequences
 184  * @disc_id:        The discovery identifier
 185  * @maxframe_size:  The maximum frame size
 186  * @retries:        The retry count for the current state
 187  * @major_retries:  The retry count for the entire PLOGI/PRLI state machine
 188  * @e_d_tov:        Error detect timeout value (in msec)
 189  * @r_a_tov:        Resource allocation timeout value (in msec)
 190  * @rp_mutex:       The mutex that protects the remote port
 191  * @retry_work:     Handle for retries
 192  * @event_callback: Callback when READY, FAILED or LOGO states complete
 193  * @prli_count:     Count of open PRLI sessions in providers
 194  * @rcu:            Structure used for freeing in an RCU-safe manner
 195  */
 196 struct fc_rport_priv {
 197         struct fc_lport             *local_port;
 198         struct fc_rport             *rport;
 199         struct kref                 kref;
 200         enum fc_rport_state         rp_state;
 201         struct fc_rport_identifiers ids;
 202         u16                         flags;
 203         u16                         max_seq;
 204         u16                         disc_id;
 205         u16                         maxframe_size;
 206         unsigned int                retries;
 207         unsigned int                major_retries;
 208         unsigned int                e_d_tov;
 209         unsigned int                r_a_tov;
 210         struct mutex                rp_mutex;
 211         struct delayed_work         retry_work;
 212         enum fc_rport_event         event;
 213         struct fc_rport_operations  *ops;
 214         struct list_head            peers;
 215         struct work_struct          event_work;
 216         u32                         supported_classes;
 217         u16                         prli_count;
 218         struct rcu_head             rcu;
 219         u16                         sp_features;
 220         u8                          spp_type;
 221         void                        (*lld_event_callback)(struct fc_lport *,
 222                                                       struct fc_rport_priv *,
 223                                                       enum fc_rport_event);
 224 };
 225
 226 /**
 227  * struct fc_stats - fc stats structure
 228  * @SecondsSinceLastReset: Seconds since the last reset
 229  * @TxFrames:              Number of transmitted frames
 230  * @TxWords:               Number of transmitted words
 231  * @RxFrames:              Number of received frames
 232  * @RxWords:               Number of received words
 233  * @ErrorFrames:           Number of received error frames
 234  * @DumpedFrames:          Number of dumped frames
 235  * @FcpPktAllocFails:      Number of fcp packet allocation failures
 236  * @FcpPktAborts:          Number of fcp packet aborts
 237  * @FcpFrameAllocFails:    Number of fcp frame allocation failures
 238  * @LinkFailureCount:      Number of link failures
 239  * @LossOfSignalCount:     Number for signal losses
 240  * @InvalidTxWordCount:    Number of invalid transmitted words
 241  * @InvalidCRCCount:       Number of invalid CRCs
 242  * @InputRequests:         Number of input requests
 243  * @OutputRequests:        Number of output requests
 244  * @ControlRequests:       Number of control requests
 245  * @InputBytes:            Number of received bytes
 246  * @OutputBytes:           Number of transmitted bytes
 247  * @VLinkFailureCount:     Number of virtual link failures
 248  * @MissDiscAdvCount:      Number of missing FIP discovery advertisement
 249  */
 250 struct fc_stats {
 251         u64             SecondsSinceLastReset;
 252         u64             TxFrames;
 253         u64             TxWords;
 254         u64             RxFrames;
 255         u64             RxWords;
 256         u64             ErrorFrames;
 257         u64             DumpedFrames;
 258         u64             FcpPktAllocFails;
 259         u64             FcpPktAborts;
 260         u64             FcpFrameAllocFails;
 261         u64             LinkFailureCount;
 262         u64             LossOfSignalCount;
 263         u64             InvalidTxWordCount;
 264         u64             InvalidCRCCount;
 265         u64             InputRequests;
 266         u64             OutputRequests;
 267         u64             ControlRequests;
 268         u64             InputBytes;
 269         u64             OutputBytes;
 270         u64             VLinkFailureCount;
 271         u64             MissDiscAdvCount;
 272 };
 273
 274 /**
 275  * struct fc_seq_els_data - ELS data used for passing ELS specific responses
 276  * @reason: The reason for rejection
 277  * @explan: The explanation of the rejection
 278  *
 279  * Mainly used by the exchange manager layer.
 280  */
 281 struct fc_seq_els_data {
 282         enum fc_els_rjt_reason reason;
 283         enum fc_els_rjt_explan explan;
 284 };
 285
 286 /**
 287  * struct fc_fcp_pkt - FCP request structure (one for each scsi_cmnd request)
 288  * @lp:              The associated local port
 289  * @state:           The state of the I/O
 290  * @ref_cnt:         Reference count
 291  * @scsi_pkt_lock:   Lock to protect the SCSI packet (must be taken before the
 292  *                   host_lock if both are to be held at the same time)
 293  * @cmd:             The SCSI command (set and clear with the host_lock held)
 294  * @list:            Tracks queued commands (accessed with the host_lock held)
 295  * @timer:           The command timer
 296  * @tm_done:         Completion indicator
 297  * @wait_for_comp:   Indicator to wait for completion of the I/O (in jiffies)
 298  * @data_len:        The length of the data
 299  * @cdb_cmd:         The CDB command
 300  * @xfer_len:        The transfer length
 301  * @xfer_ddp:        Indicates if this transfer used DDP (XID of the exchange
 302  *                   will be set here if DDP was setup)
 303  * @xfer_contig_end: The offset into the buffer if the buffer is contiguous
 304  *                   (Tx and Rx)
 305  * @max_payload:     The maximum payload size (in bytes)
 306  * @io_status:       SCSI result (upper 24 bits)
 307  * @cdb_status:      CDB status
 308  * @status_code:     FCP I/O status
 309  * @scsi_comp_flags: Completion flags (bit 3 Underrun bit 2: overrun)
 310  * @req_flags:       Request flags (bit 0: read bit:1 write)
 311  * @scsi_resid:      SCSI residule length
 312  * @rport:           The remote port that the SCSI command is targeted at
 313  * @seq_ptr:         The sequence that will carry the SCSI command
 314  * @recov_retry:     Number of recovery retries
 315  * @recov_seq:       The sequence for REC or SRR
 316  */
 317 struct fc_fcp_pkt {
 318         spinlock_t        scsi_pkt_lock;
 319         atomic_t          ref_cnt;
 320
 321         /* SCSI command and data transfer information */
 322         u32               data_len;
 323
 324         /* SCSI I/O related information */
 325         struct scsi_cmnd  *cmd;
 326         struct list_head  list;
 327
 328         /* Housekeeping information */
 329         struct fc_lport   *lp;
 330         u8                state;
 331
 332         /* SCSI/FCP return status */
 333         u8                cdb_status;
 334         u8                status_code;
 335         u8                scsi_comp_flags;
 336         u32               io_status;
 337         u32               req_flags;
 338         u32               scsi_resid;
 339
 340         /* Transport related veriables */
 341         size_t            xfer_len;
 342         struct fcp_cmnd   cdb_cmd;
 343         u32               xfer_contig_end;
 344         u16               max_payload;
 345         u16               xfer_ddp;
 346
 347         /* Associated structures */
 348         struct fc_rport   *rport;
 349         struct fc_seq     *seq_ptr;
 350
 351         /* Timeout/error related information */
 352         struct timer_list timer;
 353         int               wait_for_comp;
 354         u32               recov_retry;
 355         struct fc_seq     *recov_seq;
 356         struct completion tm_done;
 357 } ____cacheline_aligned_in_smp;
 358
 359 /*
 360  * Structure and function definitions for managing Fibre Channel Exchanges
 361  * and Sequences
 362  *
 363  * fc_exch holds state for one exchange and links to its active sequence.
 364  *
 365  * fc_seq holds the state for an individual sequence.
 366  */
 367
 368 struct fc_exch_mgr;
 369 struct fc_exch_mgr_anchor;
 370 extern u16 fc_cpu_mask; /* cpu mask for possible cpus */
 371
 372 /**
 373  * struct fc_seq - FC sequence
 374  * @id:       The sequence ID
 375  * @ssb_stat: Status flags for the sequence status block (SSB)
 376  * @cnt:      Number of frames sent so far
 377  * @rec_data: FC-4 value for REC
 378  */
 379 struct fc_seq {
 380         u8  id;
 381         u16 ssb_stat;
 382         u16 cnt;
 383         u32 rec_data;
 384 };
 385
 386 #define FC_EX_DONE              (1 << 0) /* ep is completed */
 387 #define FC_EX_RST_CLEANUP       (1 << 1) /* reset is forcing completion */
 388
 389 /**
 390  * struct fc_exch - Fibre Channel Exchange
 391  * @em:           Exchange manager
 392  * @pool:         Exchange pool
 393  * @state:        The exchange's state
 394  * @xid:          The exchange ID
 395  * @ex_list:      Handle used by the EM to track free exchanges
 396  * @ex_lock:      Lock that protects the exchange
 397  * @ex_refcnt:    Reference count
 398  * @timeout_work: Handle for timeout handler
 399  * @lp:           The local port that this exchange is on
 400  * @oxid:         Originator's exchange ID
 401  * @rxid:         Responder's exchange ID
 402  * @oid:          Originator's FCID
 403  * @sid:          Source FCID
 404  * @did:          Destination FCID
 405  * @esb_stat:     ESB exchange status
 406  * @r_a_tov:      Resouce allocation time out value (in msecs)
 407  * @seq_id:       The next sequence ID to use
 408  * @encaps:       encapsulation information for lower-level driver
 409  * @f_ctl:        F_CTL flags for the sequence
 410  * @fh_type:      The frame type
 411  * @class:        The class of service
 412  * @seq:          The sequence in use on this exchange
 413  * @resp_active:  Number of tasks that are concurrently executing @resp().
 414  * @resp_task:    If @resp_active > 0, either the task executing @resp(), the
 415  *                task that has been interrupted to execute the soft-IRQ
 416  *                executing @resp() or NULL if more than one task is executing
 417  *                @resp concurrently.
 418  * @resp_wq:      Waitqueue for the tasks waiting on @resp_active.
 419  * @resp:         Callback for responses on this exchange
 420  * @destructor:   Called when destroying the exchange
 421  * @arg:          Passed as a void pointer to the resp() callback
 422  *
 423  * Locking notes: The ex_lock protects following items:
 424  *      state, esb_stat, f_ctl, seq.ssb_stat
 425  *      seq_id
 426  *      sequence allocation
 427  */
 428 struct fc_exch {
 429         spinlock_t          ex_lock;
 430         atomic_t            ex_refcnt;
 431         enum fc_class       class;
 432         struct fc_exch_mgr  *em;
 433         struct fc_exch_pool *pool;
 434         struct list_head    ex_list;
 435         struct fc_lport     *lp;
 436         u32                 esb_stat;
 437         u8                  state;
 438         u8                  fh_type;
 439         u8                  seq_id;
 440         u8                  encaps;
 441         u16                 xid;
 442         u16                 oxid;
 443         u16                 rxid;
 444         u32                 oid;
 445         u32                 sid;
 446         u32                 did;
 447         u32                 r_a_tov;
 448         u32                 f_ctl;
 449         struct fc_seq       seq;
 450         int                 resp_active;
 451         struct task_struct  *resp_task;
 452         wait_queue_head_t   resp_wq;
 453         void                (*resp)(struct fc_seq *, struct fc_frame *, void *);
 454         void                *arg;
 455         void                (*destructor)(struct fc_seq *, void *);
 456         struct delayed_work timeout_work;
 457 } ____cacheline_aligned_in_smp;
 458 #define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
 459
 460
 461 struct libfc_function_template {
 462         /*
 463          * Interface to send a FC frame
 464          *
 465          * STATUS: REQUIRED
 466          */
 467         int (*frame_send)(struct fc_lport *, struct fc_frame *);
 468
 469         /*
 470          * Interface to send ELS/CT frames
 471          *
 472          * STATUS: OPTIONAL
 473          */
 474         struct fc_seq *(*elsct_send)(struct fc_lport *, u32 did,
 475                                      struct fc_frame *, unsigned int op,
 476                                      void (*resp)(struct fc_seq *,
 477                                              struct fc_frame *, void *arg),
 478                                      void *arg, u32 timer_msec);
 479
 480         /*
 481          * Send the FC frame payload using a new exchange and sequence.
 482          *
 483          * The exchange response handler is set in this routine to resp()
 484          * function pointer. It can be called in two scenarios: if a timeout
 485          * occurs or if a response frame is received for the exchange. The
 486          * fc_frame pointer in response handler will also indicate timeout
 487          * as error using IS_ERR related macros.
 488          *
 489          * The exchange destructor handler is also set in this routine.
 490          * The destructor handler is invoked by EM layer when exchange
 491          * is about to free, this can be used by caller to free its
 492          * resources along with exchange free.
 493          *
 494          * The arg is passed back to resp and destructor handler.
 495          *
 496          * The timeout value (in msec) for an exchange is set if non zero
 497          * timer_msec argument is specified. The timer is canceled when
 498          * it fires or when the exchange is done. The exchange timeout handler
 499          * is registered by EM layer.
 500          *
 501          * STATUS: OPTIONAL
 502          */
 503         struct fc_seq *(*exch_seq_send)(struct fc_lport *, struct fc_frame *,
 504                                         void (*resp)(struct fc_seq *,
 505                                                      struct fc_frame *,
 506                                                      void *),
 507                                         void (*destructor)(struct fc_seq *,
 508                                                            void *),
 509                                         void *, unsigned int timer_msec);
 510
 511         /*
 512          * Sets up the DDP context for a given exchange id on the given
 513          * scatterlist if LLD supports DDP for large receive.
 514          *
 515          * STATUS: OPTIONAL
 516          */
 517         int (*ddp_setup)(struct fc_lport *, u16, struct scatterlist *,
 518                          unsigned int);
 519         /*
 520          * Completes the DDP transfer and returns the length of data DDPed
 521          * for the given exchange id.
 522          *
 523          * STATUS: OPTIONAL
 524          */
 525         int (*ddp_done)(struct fc_lport *, u16);
 526         /*
 527          * Sets up the DDP context for a given exchange id on the given
 528          * scatterlist if LLD supports DDP for target.
 529          *
 530          * STATUS: OPTIONAL
 531          */
 532         int (*ddp_target)(struct fc_lport *, u16, struct scatterlist *,
 533                           unsigned int);
 534         /*
 535          * Allow LLD to fill its own Link Error Status Block
 536          *
 537          * STATUS: OPTIONAL
 538          */
 539         void (*get_lesb)(struct fc_lport *, struct fc_els_lesb *lesb);
 540         /*
 541          * Send a frame using an existing sequence and exchange.
 542          *
 543          * STATUS: OPTIONAL
 544          */
 545         int (*seq_send)(struct fc_lport *, struct fc_seq *,
 546                         struct fc_frame *);
 547
 548         /*
 549          * Send an ELS response using information from the received frame.
 550          *
 551          * STATUS: OPTIONAL
 552          */
 553         void (*seq_els_rsp_send)(struct fc_frame *, enum fc_els_cmd,
 554                                  struct fc_seq_els_data *);
 555
 556         /*
 557          * Abort an exchange and sequence. Generally called because of a
 558          * exchange timeout or an abort from the upper layer.
 559          *
 560          * A timer_msec can be specified for abort timeout, if non-zero
 561          * timer_msec value is specified then exchange resp handler
 562          * will be called with timeout error if no response to abort.
 563          *
 564          * STATUS: OPTIONAL
 565          */
 566         int (*seq_exch_abort)(const struct fc_seq *,
 567                               unsigned int timer_msec);
 568
 569         /*
 570          * Indicate that an exchange/sequence tuple is complete and the memory
 571          * allocated for the related objects may be freed.
 572          *
 573          * STATUS: OPTIONAL
 574          */
 575         void (*exch_done)(struct fc_seq *);
 576
 577         /*
 578          * Start a new sequence on the same exchange/sequence tuple.
 579          *
 580          * STATUS: OPTIONAL
 581          */
 582         struct fc_seq *(*seq_start_next)(struct fc_seq *);
 583
 584         /*
 585          * Set a response handler for the exchange of the sequence.
 586          *
 587          * STATUS: OPTIONAL
 588          */
 589         void (*seq_set_resp)(struct fc_seq *sp,
 590                              void (*resp)(struct fc_seq *, struct fc_frame *,
 591                                           void *),
 592                              void *arg);
 593
 594         /*
 595          * Assign a sequence for an incoming request frame.
 596          *
 597          * STATUS: OPTIONAL
 598          */
 599         struct fc_seq *(*seq_assign)(struct fc_lport *, struct fc_frame *);
 600
 601         /*
 602          * Release the reference on the sequence returned by seq_assign().
 603          *
 604          * STATUS: OPTIONAL
 605          */
 606         void (*seq_release)(struct fc_seq *);
 607
 608         /*
 609          * Reset an exchange manager, completing all sequences and exchanges.
 610          * If s_id is non-zero, reset only exchanges originating from that FID.
 611          * If d_id is non-zero, reset only exchanges sending to that FID.
 612          *
 613          * STATUS: OPTIONAL
 614          */
 615         void (*exch_mgr_reset)(struct fc_lport *, u32 s_id, u32 d_id);
 616
 617         /*
 618          * Flush the rport work queue. Generally used before shutdown.
 619          *
 620          * STATUS: OPTIONAL
 621          */
 622         void (*rport_flush_queue)(void);
 623
 624         /*
 625          * Receive a frame for a local port.
 626          *
 627          * STATUS: OPTIONAL
 628          */
 629         void (*lport_recv)(struct fc_lport *, struct fc_frame *);
 630
 631         /*
 632          * Reset the local port.
 633          *
 634          * STATUS: OPTIONAL
 635          */
 636         int (*lport_reset)(struct fc_lport *);
 637
 638         /*
 639          * Set the local port FC_ID.
 640          *
 641          * This may be provided by the LLD to allow it to be
 642          * notified when the local port is assigned a FC-ID.
 643          *
 644          * The frame, if non-NULL, is the incoming frame with the
 645          * FLOGI LS_ACC or FLOGI, and may contain the granted MAC
 646          * address for the LLD.  The frame pointer may be NULL if
 647          * no MAC is associated with this assignment (LOGO or PLOGI).
 648          *
 649          * If FC_ID is non-zero, r_a_tov and e_d_tov must be valid.
 650          *
 651          * Note: this is called with the local port mutex held.
 652          *
 653          * STATUS: OPTIONAL
 654          */
 655         void (*lport_set_port_id)(struct fc_lport *, u32 port_id,
 656                                   struct fc_frame *);
 657
 658         /*
 659          * Create a remote port with a given port ID
 660          *
 661          * STATUS: OPTIONAL
 662          */
 663         struct fc_rport_priv *(*rport_create)(struct fc_lport *, u32);
 664
 665         /*
 666          * Initiates the RP state machine. It is called from the LP module.
 667          * This function will issue the following commands to the N_Port
 668          * identified by the FC ID provided.
 669          *
 670          * - PLOGI
 671          * - PRLI
 672          * - RTV
 673          *
 674          * STATUS: OPTIONAL
 675          */
 676         int (*rport_login)(struct fc_rport_priv *);
 677
 678         /*
 679          * Logoff, and remove the rport from the transport if
 680          * it had been added. This will send a LOGO to the target.
 681          *
 682          * STATUS: OPTIONAL
 683          */
 684         int (*rport_logoff)(struct fc_rport_priv *);
 685
 686         /*
 687          * Receive a request from a remote port.
 688          *
 689          * STATUS: OPTIONAL
 690          */
 691         void (*rport_recv_req)(struct fc_lport *, struct fc_frame *);
 692
 693         /*
 694          * lookup an rport by it's port ID.
 695          *
 696          * STATUS: OPTIONAL
 697          */
 698         struct fc_rport_priv *(*rport_lookup)(const struct fc_lport *, u32);
 699
 700         /*
 701          * Destroy an rport after final kref_put().
 702          * The argument is a pointer to the kref inside the fc_rport_priv.
 703          */
 704         void (*rport_destroy)(struct kref *);
 705
 706         /*
 707          * Callback routine after the remote port is logged in
 708          *
 709          * STATUS: OPTIONAL
 710          */
 711         void (*rport_event_callback)(struct fc_lport *,
 712                                      struct fc_rport_priv *,
 713                                      enum fc_rport_event);
 714
 715         /*
 716          * Send a fcp cmd from fsp pkt.
 717          * Called with the SCSI host lock unlocked and irqs disabled.
 718          *
 719          * The resp handler is called when FCP_RSP received.
 720          *
 721          * STATUS: OPTIONAL
 722          */
 723         int (*fcp_cmd_send)(struct fc_lport *, struct fc_fcp_pkt *,
 724                             void (*resp)(struct fc_seq *, struct fc_frame *,
 725                                          void *));
 726
 727         /*
 728          * Cleanup the FCP layer, used during link down and reset
 729          *
 730          * STATUS: OPTIONAL
 731          */
 732         void (*fcp_cleanup)(struct fc_lport *);
 733
 734         /*
 735          * Abort all I/O on a local port
 736          *
 737          * STATUS: OPTIONAL
 738          */
 739         void (*fcp_abort_io)(struct fc_lport *);
 740
 741         /*
 742          * Receive a request for the discovery layer.
 743          *
 744          * STATUS: OPTIONAL
 745          */
 746         void (*disc_recv_req)(struct fc_lport *, struct fc_frame *);
 747
 748         /*
 749          * Start discovery for a local port.
 750          *
 751          * STATUS: OPTIONAL
 752          */
 753         void (*disc_start)(void (*disc_callback)(struct fc_lport *,
 754                                                  enum fc_disc_event),
 755                            struct fc_lport *);
 756
 757         /*
 758          * Stop discovery for a given lport. This will remove
 759          * all discovered rports
 760          *
 761          * STATUS: OPTIONAL
 762          */
 763         void (*disc_stop) (struct fc_lport *);
 764
 765         /*
 766          * Stop discovery for a given lport. This will block
 767          * until all discovered rports are deleted from the
 768          * FC transport class
 769          *
 770          * STATUS: OPTIONAL
 771          */
 772         void (*disc_stop_final) (struct fc_lport *);
 773 };
 774
 775 /**
 776  * struct fc_disc - Discovery context
 777  * @retry_count:   Number of retries
 778  * @pending:       1 if discovery is pending, 0 if not
 779  * @requested:     1 if discovery has been requested, 0 if not
 780  * @seq_count:     Number of sequences used for discovery
 781  * @buf_len:       Length of the discovery buffer
 782  * @disc_id:       Discovery ID
 783  * @rports:        List of discovered remote ports
 784  * @priv:          Private pointer for use by discovery code
 785  * @disc_mutex:    Mutex that protects the discovery context
 786  * @partial_buf:   Partial name buffer (if names are returned
 787  *                 in multiple frames)
 788  * @disc_work:     handle for delayed work context
 789  * @disc_callback: Callback routine called when discovery completes
 790  */
 791 struct fc_disc {
 792         unsigned char         retry_count;
 793         unsigned char         pending;
 794         unsigned char         requested;
 795         unsigned short        seq_count;
 796         unsigned char         buf_len;
 797         u16                   disc_id;
 798
 799         struct list_head      rports;
 800         void                  *priv;
 801         struct mutex          disc_mutex;
 802         struct fc_gpn_ft_resp partial_buf;
 803         struct delayed_work   disc_work;
 804
 805         void (*disc_callback)(struct fc_lport *,
 806                               enum fc_disc_event);
 807 };
 808
 809 /*
 810  * Local port notifier and events.
 811  */
 812 extern struct blocking_notifier_head fc_lport_notifier_head;
 813 enum fc_lport_event {
 814         FC_LPORT_EV_ADD,
 815         FC_LPORT_EV_DEL,
 816 };
 817
 818 /**
 819  * struct fc_lport - Local port
 820  * @host:                  The SCSI host associated with a local port
 821  * @ema_list:              Exchange manager anchor list
 822  * @dns_rdata:             The directory server remote port
 823  * @ms_rdata:              The management server remote port
 824  * @ptp_rdata:             Point to point remote port
 825  * @scsi_priv:             FCP layer internal data
 826  * @disc:                  Discovery context
 827  * @vports:                Child vports if N_Port
 828  * @vport:                 Parent vport if VN_Port
 829  * @tt:                    Libfc function template
 830  * @link_up:               Link state (1 = link up, 0 = link down)
 831  * @qfull:                 Queue state (1 queue is full, 0 queue is not full)
 832  * @state:                 Identifies the state
 833  * @boot_time:             Timestamp indicating when the local port came online
 834  * @host_stats:            SCSI host statistics
 835  * @stats:                 FC local port stats (TODO separate libfc LLD stats)
 836  * @retry_count:           Number of retries in the current state
 837  * @port_id:               FC Port ID
 838  * @wwpn:                  World Wide Port Name
 839  * @wwnn:                  World Wide Node Name
 840  * @service_params:        Common service parameters
 841  * @e_d_tov:               Error detection timeout value
 842  * @r_a_tov:               Resouce allocation timeout value
 843  * @rnid_gen:              RNID information
 844  * @sg_supp:               Indicates if scatter gather is supported
 845  * @seq_offload:           Indicates if sequence offload is supported
 846  * @crc_offload:           Indicates if CRC offload is supported
 847  * @lro_enabled:           Indicates if large receive offload is supported
 848  * @does_npiv:             Supports multiple vports
 849  * @npiv_enabled:          Switch/fabric allows NPIV
 850  * @mfs:                   The maximum Fibre Channel payload size
 851  * @max_retry_count:       The maximum retry attempts
 852  * @max_rport_retry_count: The maximum remote port retry attempts
 853  * @rport_priv_size:       Size needed by driver after struct fc_rport_priv
 854  * @lro_xid:               The maximum XID for LRO
 855  * @lso_max:               The maximum large offload send size
 856  * @fcts:                  FC-4 type mask
 857  * @lp_mutex:              Mutex to protect the local port
 858  * @list:                  Linkage on list of vport peers
 859  * @retry_work:            Handle to local port for delayed retry context
 860  * @prov:                  Pointers available for use by passive FC-4 providers
 861  * @lport_list:            Linkage on module-wide list of local ports
 862  */
 863 struct fc_lport {
 864         /* Associations */
 865         struct Scsi_Host               *host;
 866         struct list_head               ema_list;
 867         struct fc_rport_priv           *dns_rdata;
 868         struct fc_rport_priv           *ms_rdata;
 869         struct fc_rport_priv           *ptp_rdata;
 870         void                           *scsi_priv;
 871         struct fc_disc                 disc;
 872
 873         /* Virtual port information */
 874         struct list_head               vports;
 875         struct fc_vport                *vport;
 876
 877         /* Operational Information */
 878         struct libfc_function_template tt;
 879         u8                             link_up;
 880         u8                             qfull;
 881         enum fc_lport_state            state;
 882         unsigned long                  boot_time;
 883         struct fc_host_statistics      host_stats;
 884         struct fc_stats __percpu       *stats;
 885         u8                             retry_count;
 886
 887         /* Fabric information */
 888         u32                            port_id;
 889         u64                            wwpn;
 890         u64                            wwnn;
 891         unsigned int                   service_params;
 892         unsigned int                   e_d_tov;
 893         unsigned int                   r_a_tov;
 894         struct fc_els_rnid_gen         rnid_gen;
 895
 896         /* Capabilities */
 897         u32                            sg_supp:1;
 898         u32                            seq_offload:1;
 899         u32                            crc_offload:1;
 900         u32                            lro_enabled:1;
 901         u32                            does_npiv:1;
 902         u32                            npiv_enabled:1;
 903         u32                            point_to_multipoint:1;
 904         u32                            fdmi_enabled:1;
 905         u32                            mfs;
 906         u8                             max_retry_count;
 907         u8                             max_rport_retry_count;
 908         u16                            rport_priv_size;
 909         u16                            link_speed;
 910         u16                            link_supported_speeds;
 911         u16                            lro_xid;
 912         unsigned int                   lso_max;
 913         struct fc_ns_fts               fcts;
 914
 915         /* Miscellaneous */
 916         struct mutex                   lp_mutex;
 917         struct list_head               list;
 918         struct delayed_work            retry_work;
 919         void                           *prov[FC_FC4_PROV_SIZE];
 920         struct list_head               lport_list;
 921 };
 922
 923 /**
 924  * struct fc4_prov - FC-4 provider registration
 925  * @prli:               Handler for incoming PRLI
 926  * @prlo:               Handler for session reset
 927  * @recv:               Handler for incoming request
 928  * @module:             Pointer to module.  May be NULL.
 929  */
 930 struct fc4_prov {
 931         int (*prli)(struct fc_rport_priv *, u32 spp_len,
 932                     const struct fc_els_spp *spp_in,
 933                     struct fc_els_spp *spp_out);
 934         void (*prlo)(struct fc_rport_priv *);
 935         void (*recv)(struct fc_lport *, struct fc_frame *);
 936         struct module *module;
 937 };
 938
 939 /*
 940  * Register FC-4 provider with libfc.
 941  */
 942 int fc_fc4_register_provider(enum fc_fh_type type, struct fc4_prov *);
 943 void fc_fc4_deregister_provider(enum fc_fh_type type, struct fc4_prov *);
 944
 945 /*
 946  * FC_LPORT HELPER FUNCTIONS
 947  *****************************/
 948
 949 /**
 950  * fc_lport_test_ready() - Determine if a local port is in the READY state
 951  * @lport: The local port to test
 952  */
 953 static inline int fc_lport_test_ready(struct fc_lport *lport)
 954 {
 955         return lport->state == LPORT_ST_READY;
 956 }
 957
 958 /**
 959  * fc_set_wwnn() - Set the World Wide Node Name of a local port
 960  * @lport: The local port whose WWNN is to be set
 961  * @wwnn:  The new WWNN
 962  */
 963 static inline void fc_set_wwnn(struct fc_lport *lport, u64 wwnn)
 964 {
 965         lport->wwnn = wwnn;
 966 }
 967
 968 /**
 969  * fc_set_wwpn() - Set the World Wide Port Name of a local port
 970  * @lport: The local port whose WWPN is to be set
 971  * @wwnn:  The new WWPN
 972  */
 973 static inline void fc_set_wwpn(struct fc_lport *lport, u64 wwnn)
 974 {
 975         lport->wwpn = wwnn;
 976 }
 977
 978 /**
 979  * fc_lport_state_enter() - Change a local port's state
 980  * @lport: The local port whose state is to change
 981  * @state: The new state
 982  */
 983 static inline void fc_lport_state_enter(struct fc_lport *lport,
 984                                         enum fc_lport_state state)
 985 {
 986         if (state != lport->state)
 987                 lport->retry_count = 0;
 988         lport->state = state;
 989 }
 990
 991 /**
 992  * fc_lport_init_stats() - Allocate per-CPU statistics for a local port
 993  * @lport: The local port whose statistics are to be initialized
 994  */
 995 static inline int fc_lport_init_stats(struct fc_lport *lport)
 996 {
 997         lport->stats = alloc_percpu(struct fc_stats);
 998         if (!lport->stats)
 999                 return -ENOMEM;
1000         return 0;
1001 }
1002
1003 /**
1004  * fc_lport_free_stats() - Free memory for a local port's statistics
1005  * @lport: The local port whose statistics are to be freed
1006  */
1007 static inline void fc_lport_free_stats(struct fc_lport *lport)
1008 {
1009         free_percpu(lport->stats);
1010 }
1011
1012 /**
1013  * lport_priv() - Return the private data from a local port
1014  * @lport: The local port whose private data is to be retreived
1015  */
1016 static inline void *lport_priv(const struct fc_lport *lport)
1017 {
1018         return (void *)(lport + 1);
1019 }
1020
1021 /**
1022  * libfc_host_alloc() - Allocate a Scsi_Host with room for a local port and
1023  *                      LLD private data
1024  * @sht:       The SCSI host template
1025  * @priv_size: Size of private data
1026  *
1027  * Returns: libfc lport
1028  */
1029 static inline struct fc_lport *
1030 libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
1031 {
1032         struct fc_lport *lport;
1033         struct Scsi_Host *shost;
1034
1035         shost = scsi_host_alloc(sht, sizeof(*lport) + priv_size);
1036         if (!shost)
1037                 return NULL;
1038         lport = shost_priv(shost);
1039         lport->host = shost;
1040         INIT_LIST_HEAD(&lport->ema_list);
1041         INIT_LIST_HEAD(&lport->vports);
1042         return lport;
1043 }
1044
1045 /*
1046  * FC_FCP HELPER FUNCTIONS
1047  *****************************/
1048 static inline bool fc_fcp_is_read(const struct fc_fcp_pkt *fsp)
1049 {
1050         if (fsp && fsp->cmd)
1051                 return fsp->cmd->sc_data_direction == DMA_FROM_DEVICE;
1052         return false;
1053 }
1054
1055 /*
1056  * LOCAL PORT LAYER
1057  *****************************/
1058 int fc_lport_init(struct fc_lport *);
1059 int fc_lport_destroy(struct fc_lport *);
1060 int fc_fabric_logoff(struct fc_lport *);
1061 int fc_fabric_login(struct fc_lport *);
1062 void __fc_linkup(struct fc_lport *);
1063 void fc_linkup(struct fc_lport *);
1064 void __fc_linkdown(struct fc_lport *);
1065 void fc_linkdown(struct fc_lport *);
1066 void fc_vport_setlink(struct fc_lport *);
1067 void fc_vports_linkchange(struct fc_lport *);
1068 int fc_lport_config(struct fc_lport *);
1069 int fc_lport_reset(struct fc_lport *);
1070 int fc_set_mfs(struct fc_lport *, u32 mfs);
1071 struct fc_lport *libfc_vport_create(struct fc_vport *, int privsize);
1072 struct fc_lport *fc_vport_id_lookup(struct fc_lport *, u32 port_id);
1073 int fc_lport_bsg_request(struct fc_bsg_job *);
1074 void fc_lport_set_local_id(struct fc_lport *, u32 port_id);
1075 void fc_lport_iterate(void (*func)(struct fc_lport *, void *), void *);
1076
1077 /*
1078  * REMOTE PORT LAYER
1079  *****************************/
1080 int fc_rport_init(struct fc_lport *);
1081 void fc_rport_terminate_io(struct fc_rport *);
1082
1083 /*
1084  * DISCOVERY LAYER
1085  *****************************/
1086 void fc_disc_init(struct fc_lport *);
1087 void fc_disc_config(struct fc_lport *, void *);
1088
1089 static inline struct fc_lport *fc_disc_lport(struct fc_disc *disc)
1090 {
1091         return container_of(disc, struct fc_lport, disc);
1092 }
1093
1094 /*
1095  * FCP LAYER
1096  *****************************/
1097 int fc_fcp_init(struct fc_lport *);
1098 void fc_fcp_destroy(struct fc_lport *);
1099
1100 /*
1101  * SCSI INTERACTION LAYER
1102  *****************************/
1103 int fc_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
1104 int fc_eh_abort(struct scsi_cmnd *);
1105 int fc_eh_device_reset(struct scsi_cmnd *);
1106 int fc_eh_host_reset(struct scsi_cmnd *);
1107 int fc_slave_alloc(struct scsi_device *);
1108
1109 /*
1110  * ELS/CT interface
1111  *****************************/
1112 int fc_elsct_init(struct fc_lport *);
1113 struct fc_seq *fc_elsct_send(struct fc_lport *, u32 did,
1114                                     struct fc_frame *,
1115                                     unsigned int op,
1116                                     void (*resp)(struct fc_seq *,
1117                                                  struct fc_frame *,
1118                                                  void *arg),
1119                                     void *arg, u32 timer_msec);
1120 void fc_lport_flogi_resp(struct fc_seq *, struct fc_frame *, void *);
1121 void fc_lport_logo_resp(struct fc_seq *, struct fc_frame *, void *);
1122 void fc_fill_reply_hdr(struct fc_frame *, const struct fc_frame *,
1123                        enum fc_rctl, u32 parm_offset);
1124 void fc_fill_hdr(struct fc_frame *, const struct fc_frame *,
1125                  enum fc_rctl, u32 f_ctl, u16 seq_cnt, u32 parm_offset);
1126
1127
1128 /*
1129  * EXCHANGE MANAGER LAYER
1130  *****************************/
1131 int fc_exch_init(struct fc_lport *);
1132 void fc_exch_update_stats(struct fc_lport *lport);
1133 struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *,
1134                                            struct fc_exch_mgr *,
1135                                            bool (*match)(struct fc_frame *));
1136 void fc_exch_mgr_del(struct fc_exch_mgr_anchor *);
1137 int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst);
1138 struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *, enum fc_class class,
1139                                       u16 min_xid, u16 max_xid,
1140                                       bool (*match)(struct fc_frame *));
1141 void fc_exch_mgr_free(struct fc_lport *);
1142 void fc_exch_recv(struct fc_lport *, struct fc_frame *);
1143 void fc_exch_mgr_reset(struct fc_lport *, u32 s_id, u32 d_id);
1144
1145 /*
1146  * Functions for fc_functions_template
1147  */
1148 void fc_get_host_speed(struct Scsi_Host *);
1149 void fc_get_host_port_state(struct Scsi_Host *);
1150 void fc_set_rport_loss_tmo(struct fc_rport *, u32 timeout);
1151 struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *);
1152
1153 #endif /* _LIBFC_H_ */