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:         Callback for responses on this exchange
 414  * @destructor:   Called when destroying the exchange
 415  * @arg:          Passed as a void pointer to the resp() callback
 416  *
 417  * Locking notes: The ex_lock protects following items:
 418  *      state, esb_stat, f_ctl, seq.ssb_stat
 419  *      seq_id
 420  *      sequence allocation
 421  */
 422 struct fc_exch {
 423         spinlock_t          ex_lock;
 424         atomic_t            ex_refcnt;
 425         enum fc_class       class;
 426         struct fc_exch_mgr  *em;
 427         struct fc_exch_pool *pool;
 428         struct list_head    ex_list;
 429         struct fc_lport     *lp;
 430         u32                 esb_stat;
 431         u8                  state;
 432         u8                  fh_type;
 433         u8                  seq_id;
 434         u8                  encaps;
 435         u16                 xid;
 436         u16                 oxid;
 437         u16                 rxid;
 438         u32                 oid;
 439         u32                 sid;
 440         u32                 did;
 441         u32                 r_a_tov;
 442         u32                 f_ctl;
 443         struct fc_seq       seq;
 444         void                (*resp)(struct fc_seq *, struct fc_frame *, void *);
 445         void                *arg;
 446         void                (*destructor)(struct fc_seq *, void *);
 447         struct delayed_work timeout_work;
 448 } ____cacheline_aligned_in_smp;
 449 #define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
 450
 451
 452 struct libfc_function_template {
 453         /*
 454          * Interface to send a FC frame
 455          *
 456          * STATUS: REQUIRED
 457          */
 458         int (*frame_send)(struct fc_lport *, struct fc_frame *);
 459
 460         /*
 461          * Interface to send ELS/CT frames
 462          *
 463          * STATUS: OPTIONAL
 464          */
 465         struct fc_seq *(*elsct_send)(struct fc_lport *, u32 did,
 466                                      struct fc_frame *, unsigned int op,
 467                                      void (*resp)(struct fc_seq *,
 468                                              struct fc_frame *, void *arg),
 469                                      void *arg, u32 timer_msec);
 470
 471         /*
 472          * Send the FC frame payload using a new exchange and sequence.
 473          *
 474          * The exchange response handler is set in this routine to resp()
 475          * function pointer. It can be called in two scenarios: if a timeout
 476          * occurs or if a response frame is received for the exchange. The
 477          * fc_frame pointer in response handler will also indicate timeout
 478          * as error using IS_ERR related macros.
 479          *
 480          * The exchange destructor handler is also set in this routine.
 481          * The destructor handler is invoked by EM layer when exchange
 482          * is about to free, this can be used by caller to free its
 483          * resources along with exchange free.
 484          *
 485          * The arg is passed back to resp and destructor handler.
 486          *
 487          * The timeout value (in msec) for an exchange is set if non zero
 488          * timer_msec argument is specified. The timer is canceled when
 489          * it fires or when the exchange is done. The exchange timeout handler
 490          * is registered by EM layer.
 491          *
 492          * STATUS: OPTIONAL
 493          */
 494         struct fc_seq *(*exch_seq_send)(struct fc_lport *, struct fc_frame *,
 495                                         void (*resp)(struct fc_seq *,
 496                                                      struct fc_frame *,
 497                                                      void *),
 498                                         void (*destructor)(struct fc_seq *,
 499                                                            void *),
 500                                         void *, unsigned int timer_msec);
 501
 502         /*
 503          * Sets up the DDP context for a given exchange id on the given
 504          * scatterlist if LLD supports DDP for large receive.
 505          *
 506          * STATUS: OPTIONAL
 507          */
 508         int (*ddp_setup)(struct fc_lport *, u16, struct scatterlist *,
 509                          unsigned int);
 510         /*
 511          * Completes the DDP transfer and returns the length of data DDPed
 512          * for the given exchange id.
 513          *
 514          * STATUS: OPTIONAL
 515          */
 516         int (*ddp_done)(struct fc_lport *, u16);
 517         /*
 518          * Sets up the DDP context for a given exchange id on the given
 519          * scatterlist if LLD supports DDP for target.
 520          *
 521          * STATUS: OPTIONAL
 522          */
 523         int (*ddp_target)(struct fc_lport *, u16, struct scatterlist *,
 524                           unsigned int);
 525         /*
 526          * Allow LLD to fill its own Link Error Status Block
 527          *
 528          * STATUS: OPTIONAL
 529          */
 530         void (*get_lesb)(struct fc_lport *, struct fc_els_lesb *lesb);
 531         /*
 532          * Send a frame using an existing sequence and exchange.
 533          *
 534          * STATUS: OPTIONAL
 535          */
 536         int (*seq_send)(struct fc_lport *, struct fc_seq *,
 537                         struct fc_frame *);
 538
 539         /*
 540          * Send an ELS response using information from the received frame.
 541          *
 542          * STATUS: OPTIONAL
 543          */
 544         void (*seq_els_rsp_send)(struct fc_frame *, enum fc_els_cmd,
 545                                  struct fc_seq_els_data *);
 546
 547         /*
 548          * Abort an exchange and sequence. Generally called because of a
 549          * exchange timeout or an abort from the upper layer.
 550          *
 551          * A timer_msec can be specified for abort timeout, if non-zero
 552          * timer_msec value is specified then exchange resp handler
 553          * will be called with timeout error if no response to abort.
 554          *
 555          * STATUS: OPTIONAL
 556          */
 557         int (*seq_exch_abort)(const struct fc_seq *,
 558                               unsigned int timer_msec);
 559
 560         /*
 561          * Indicate that an exchange/sequence tuple is complete and the memory
 562          * allocated for the related objects may be freed.
 563          *
 564          * STATUS: OPTIONAL
 565          */
 566         void (*exch_done)(struct fc_seq *);
 567
 568         /*
 569          * Start a new sequence on the same exchange/sequence tuple.
 570          *
 571          * STATUS: OPTIONAL
 572          */
 573         struct fc_seq *(*seq_start_next)(struct fc_seq *);
 574
 575         /*
 576          * Set a response handler for the exchange of the sequence.
 577          *
 578          * STATUS: OPTIONAL
 579          */
 580         void (*seq_set_resp)(struct fc_seq *sp,
 581                              void (*resp)(struct fc_seq *, struct fc_frame *,
 582                                           void *),
 583                              void *arg);
 584
 585         /*
 586          * Assign a sequence for an incoming request frame.
 587          *
 588          * STATUS: OPTIONAL
 589          */
 590         struct fc_seq *(*seq_assign)(struct fc_lport *, struct fc_frame *);
 591
 592         /*
 593          * Release the reference on the sequence returned by seq_assign().
 594          *
 595          * STATUS: OPTIONAL
 596          */
 597         void (*seq_release)(struct fc_seq *);
 598
 599         /*
 600          * Reset an exchange manager, completing all sequences and exchanges.
 601          * If s_id is non-zero, reset only exchanges originating from that FID.
 602          * If d_id is non-zero, reset only exchanges sending to that FID.
 603          *
 604          * STATUS: OPTIONAL
 605          */
 606         void (*exch_mgr_reset)(struct fc_lport *, u32 s_id, u32 d_id);
 607
 608         /*
 609          * Flush the rport work queue. Generally used before shutdown.
 610          *
 611          * STATUS: OPTIONAL
 612          */
 613         void (*rport_flush_queue)(void);
 614
 615         /*
 616          * Receive a frame for a local port.
 617          *
 618          * STATUS: OPTIONAL
 619          */
 620         void (*lport_recv)(struct fc_lport *, struct fc_frame *);
 621
 622         /*
 623          * Reset the local port.
 624          *
 625          * STATUS: OPTIONAL
 626          */
 627         int (*lport_reset)(struct fc_lport *);
 628
 629         /*
 630          * Set the local port FC_ID.
 631          *
 632          * This may be provided by the LLD to allow it to be
 633          * notified when the local port is assigned a FC-ID.
 634          *
 635          * The frame, if non-NULL, is the incoming frame with the
 636          * FLOGI LS_ACC or FLOGI, and may contain the granted MAC
 637          * address for the LLD.  The frame pointer may be NULL if
 638          * no MAC is associated with this assignment (LOGO or PLOGI).
 639          *
 640          * If FC_ID is non-zero, r_a_tov and e_d_tov must be valid.
 641          *
 642          * Note: this is called with the local port mutex held.
 643          *
 644          * STATUS: OPTIONAL
 645          */
 646         void (*lport_set_port_id)(struct fc_lport *, u32 port_id,
 647                                   struct fc_frame *);
 648
 649         /*
 650          * Create a remote port with a given port ID
 651          *
 652          * STATUS: OPTIONAL
 653          */
 654         struct fc_rport_priv *(*rport_create)(struct fc_lport *, u32);
 655
 656         /*
 657          * Initiates the RP state machine. It is called from the LP module.
 658          * This function will issue the following commands to the N_Port
 659          * identified by the FC ID provided.
 660          *
 661          * - PLOGI
 662          * - PRLI
 663          * - RTV
 664          *
 665          * STATUS: OPTIONAL
 666          */
 667         int (*rport_login)(struct fc_rport_priv *);
 668
 669         /*
 670          * Logoff, and remove the rport from the transport if
 671          * it had been added. This will send a LOGO to the target.
 672          *
 673          * STATUS: OPTIONAL
 674          */
 675         int (*rport_logoff)(struct fc_rport_priv *);
 676
 677         /*
 678          * Receive a request from a remote port.
 679          *
 680          * STATUS: OPTIONAL
 681          */
 682         void (*rport_recv_req)(struct fc_lport *, struct fc_frame *);
 683
 684         /*
 685          * lookup an rport by it's port ID.
 686          *
 687          * STATUS: OPTIONAL
 688          */
 689         struct fc_rport_priv *(*rport_lookup)(const struct fc_lport *, u32);
 690
 691         /*
 692          * Destroy an rport after final kref_put().
 693          * The argument is a pointer to the kref inside the fc_rport_priv.
 694          */
 695         void (*rport_destroy)(struct kref *);
 696
 697         /*
 698          * Callback routine after the remote port is logged in
 699          *
 700          * STATUS: OPTIONAL
 701          */
 702         void (*rport_event_callback)(struct fc_lport *,
 703                                      struct fc_rport_priv *,
 704                                      enum fc_rport_event);
 705
 706         /*
 707          * Send a fcp cmd from fsp pkt.
 708          * Called with the SCSI host lock unlocked and irqs disabled.
 709          *
 710          * The resp handler is called when FCP_RSP received.
 711          *
 712          * STATUS: OPTIONAL
 713          */
 714         int (*fcp_cmd_send)(struct fc_lport *, struct fc_fcp_pkt *,
 715                             void (*resp)(struct fc_seq *, struct fc_frame *,
 716                                          void *));
 717
 718         /*
 719          * Cleanup the FCP layer, used during link down and reset
 720          *
 721          * STATUS: OPTIONAL
 722          */
 723         void (*fcp_cleanup)(struct fc_lport *);
 724
 725         /*
 726          * Abort all I/O on a local port
 727          *
 728          * STATUS: OPTIONAL
 729          */
 730         void (*fcp_abort_io)(struct fc_lport *);
 731
 732         /*
 733          * Receive a request for the discovery layer.
 734          *
 735          * STATUS: OPTIONAL
 736          */
 737         void (*disc_recv_req)(struct fc_lport *, struct fc_frame *);
 738
 739         /*
 740          * Start discovery for a local port.
 741          *
 742          * STATUS: OPTIONAL
 743          */
 744         void (*disc_start)(void (*disc_callback)(struct fc_lport *,
 745                                                  enum fc_disc_event),
 746                            struct fc_lport *);
 747
 748         /*
 749          * Stop discovery for a given lport. This will remove
 750          * all discovered rports
 751          *
 752          * STATUS: OPTIONAL
 753          */
 754         void (*disc_stop) (struct fc_lport *);
 755
 756         /*
 757          * Stop discovery for a given lport. This will block
 758          * until all discovered rports are deleted from the
 759          * FC transport class
 760          *
 761          * STATUS: OPTIONAL
 762          */
 763         void (*disc_stop_final) (struct fc_lport *);
 764 };
 765
 766 /**
 767  * struct fc_disc - Discovery context
 768  * @retry_count:   Number of retries
 769  * @pending:       1 if discovery is pending, 0 if not
 770  * @requested:     1 if discovery has been requested, 0 if not
 771  * @seq_count:     Number of sequences used for discovery
 772  * @buf_len:       Length of the discovery buffer
 773  * @disc_id:       Discovery ID
 774  * @rports:        List of discovered remote ports
 775  * @priv:          Private pointer for use by discovery code
 776  * @disc_mutex:    Mutex that protects the discovery context
 777  * @partial_buf:   Partial name buffer (if names are returned
 778  *                 in multiple frames)
 779  * @disc_work:     handle for delayed work context
 780  * @disc_callback: Callback routine called when discovery completes
 781  */
 782 struct fc_disc {
 783         unsigned char         retry_count;
 784         unsigned char         pending;
 785         unsigned char         requested;
 786         unsigned short        seq_count;
 787         unsigned char         buf_len;
 788         u16                   disc_id;
 789
 790         struct list_head      rports;
 791         void                  *priv;
 792         struct mutex          disc_mutex;
 793         struct fc_gpn_ft_resp partial_buf;
 794         struct delayed_work   disc_work;
 795
 796         void (*disc_callback)(struct fc_lport *,
 797                               enum fc_disc_event);
 798 };
 799
 800 /*
 801  * Local port notifier and events.
 802  */
 803 extern struct blocking_notifier_head fc_lport_notifier_head;
 804 enum fc_lport_event {
 805         FC_LPORT_EV_ADD,
 806         FC_LPORT_EV_DEL,
 807 };
 808
 809 /**
 810  * struct fc_lport - Local port
 811  * @host:                  The SCSI host associated with a local port
 812  * @ema_list:              Exchange manager anchor list
 813  * @dns_rdata:             The directory server remote port
 814  * @ms_rdata:              The management server remote port
 815  * @ptp_rdata:             Point to point remote port
 816  * @scsi_priv:             FCP layer internal data
 817  * @disc:                  Discovery context
 818  * @vports:                Child vports if N_Port
 819  * @vport:                 Parent vport if VN_Port
 820  * @tt:                    Libfc function template
 821  * @link_up:               Link state (1 = link up, 0 = link down)
 822  * @qfull:                 Queue state (1 queue is full, 0 queue is not full)
 823  * @state:                 Identifies the state
 824  * @boot_time:             Timestamp indicating when the local port came online
 825  * @host_stats:            SCSI host statistics
 826  * @stats:                 FC local port stats (TODO separate libfc LLD stats)
 827  * @retry_count:           Number of retries in the current state
 828  * @port_id:               FC Port ID
 829  * @wwpn:                  World Wide Port Name
 830  * @wwnn:                  World Wide Node Name
 831  * @service_params:        Common service parameters
 832  * @e_d_tov:               Error detection timeout value
 833  * @r_a_tov:               Resouce allocation timeout value
 834  * @rnid_gen:              RNID information
 835  * @sg_supp:               Indicates if scatter gather is supported
 836  * @seq_offload:           Indicates if sequence offload is supported
 837  * @crc_offload:           Indicates if CRC offload is supported
 838  * @lro_enabled:           Indicates if large receive offload is supported
 839  * @does_npiv:             Supports multiple vports
 840  * @npiv_enabled:          Switch/fabric allows NPIV
 841  * @mfs:                   The maximum Fibre Channel payload size
 842  * @max_retry_count:       The maximum retry attempts
 843  * @max_rport_retry_count: The maximum remote port retry attempts
 844  * @rport_priv_size:       Size needed by driver after struct fc_rport_priv
 845  * @lro_xid:               The maximum XID for LRO
 846  * @lso_max:               The maximum large offload send size
 847  * @fcts:                  FC-4 type mask
 848  * @lp_mutex:              Mutex to protect the local port
 849  * @list:                  Linkage on list of vport peers
 850  * @retry_work:            Handle to local port for delayed retry context
 851  * @prov:                  Pointers available for use by passive FC-4 providers
 852  * @lport_list:            Linkage on module-wide list of local ports
 853  */
 854 struct fc_lport {
 855         /* Associations */
 856         struct Scsi_Host               *host;
 857         struct list_head               ema_list;
 858         struct fc_rport_priv           *dns_rdata;
 859         struct fc_rport_priv           *ms_rdata;
 860         struct fc_rport_priv           *ptp_rdata;
 861         void                           *scsi_priv;
 862         struct fc_disc                 disc;
 863
 864         /* Virtual port information */
 865         struct list_head               vports;
 866         struct fc_vport                *vport;
 867
 868         /* Operational Information */
 869         struct libfc_function_template tt;
 870         u8                             link_up;
 871         u8                             qfull;
 872         enum fc_lport_state            state;
 873         unsigned long                  boot_time;
 874         struct fc_host_statistics      host_stats;
 875         struct fc_stats __percpu       *stats;
 876         u8                             retry_count;
 877
 878         /* Fabric information */
 879         u32                            port_id;
 880         u64                            wwpn;
 881         u64                            wwnn;
 882         unsigned int                   service_params;
 883         unsigned int                   e_d_tov;
 884         unsigned int                   r_a_tov;
 885         struct fc_els_rnid_gen         rnid_gen;
 886
 887         /* Capabilities */
 888         u32                            sg_supp:1;
 889         u32                            seq_offload:1;
 890         u32                            crc_offload:1;
 891         u32                            lro_enabled:1;
 892         u32                            does_npiv:1;
 893         u32                            npiv_enabled:1;
 894         u32                            point_to_multipoint:1;
 895         u32                            fdmi_enabled:1;
 896         u32                            mfs;
 897         u8                             max_retry_count;
 898         u8                             max_rport_retry_count;
 899         u16                            rport_priv_size;
 900         u16                            link_speed;
 901         u16                            link_supported_speeds;
 902         u16                            lro_xid;
 903         unsigned int                   lso_max;
 904         struct fc_ns_fts               fcts;
 905
 906         /* Miscellaneous */
 907         struct mutex                   lp_mutex;
 908         struct list_head               list;
 909         struct delayed_work            retry_work;
 910         void                           *prov[FC_FC4_PROV_SIZE];
 911         struct list_head               lport_list;
 912 };
 913
 914 /**
 915  * struct fc4_prov - FC-4 provider registration
 916  * @prli:               Handler for incoming PRLI
 917  * @prlo:               Handler for session reset
 918  * @recv:               Handler for incoming request
 919  * @module:             Pointer to module.  May be NULL.
 920  */
 921 struct fc4_prov {
 922         int (*prli)(struct fc_rport_priv *, u32 spp_len,
 923                     const struct fc_els_spp *spp_in,
 924                     struct fc_els_spp *spp_out);
 925         void (*prlo)(struct fc_rport_priv *);
 926         void (*recv)(struct fc_lport *, struct fc_frame *);
 927         struct module *module;
 928 };
 929
 930 /*
 931  * Register FC-4 provider with libfc.
 932  */
 933 int fc_fc4_register_provider(enum fc_fh_type type, struct fc4_prov *);
 934 void fc_fc4_deregister_provider(enum fc_fh_type type, struct fc4_prov *);
 935
 936 /*
 937  * FC_LPORT HELPER FUNCTIONS
 938  *****************************/
 939
 940 /**
 941  * fc_lport_test_ready() - Determine if a local port is in the READY state
 942  * @lport: The local port to test
 943  */
 944 static inline int fc_lport_test_ready(struct fc_lport *lport)
 945 {
 946         return lport->state == LPORT_ST_READY;
 947 }
 948
 949 /**
 950  * fc_set_wwnn() - Set the World Wide Node Name of a local port
 951  * @lport: The local port whose WWNN is to be set
 952  * @wwnn:  The new WWNN
 953  */
 954 static inline void fc_set_wwnn(struct fc_lport *lport, u64 wwnn)
 955 {
 956         lport->wwnn = wwnn;
 957 }
 958
 959 /**
 960  * fc_set_wwpn() - Set the World Wide Port Name of a local port
 961  * @lport: The local port whose WWPN is to be set
 962  * @wwnn:  The new WWPN
 963  */
 964 static inline void fc_set_wwpn(struct fc_lport *lport, u64 wwnn)
 965 {
 966         lport->wwpn = wwnn;
 967 }
 968
 969 /**
 970  * fc_lport_state_enter() - Change a local port's state
 971  * @lport: The local port whose state is to change
 972  * @state: The new state
 973  */
 974 static inline void fc_lport_state_enter(struct fc_lport *lport,
 975                                         enum fc_lport_state state)
 976 {
 977         if (state != lport->state)
 978                 lport->retry_count = 0;
 979         lport->state = state;
 980 }
 981
 982 /**
 983  * fc_lport_init_stats() - Allocate per-CPU statistics for a local port
 984  * @lport: The local port whose statistics are to be initialized
 985  */
 986 static inline int fc_lport_init_stats(struct fc_lport *lport)
 987 {
 988         lport->stats = alloc_percpu(struct fc_stats);
 989         if (!lport->stats)
 990                 return -ENOMEM;
 991         return 0;
 992 }
 993
 994 /**
 995  * fc_lport_free_stats() - Free memory for a local port's statistics
 996  * @lport: The local port whose statistics are to be freed
 997  */
 998 static inline void fc_lport_free_stats(struct fc_lport *lport)
 999 {
1000         free_percpu(lport->stats);
1001 }
1002
1003 /**
1004  * lport_priv() - Return the private data from a local port
1005  * @lport: The local port whose private data is to be retreived
1006  */
1007 static inline void *lport_priv(const struct fc_lport *lport)
1008 {
1009         return (void *)(lport + 1);
1010 }
1011
1012 /**
1013  * libfc_host_alloc() - Allocate a Scsi_Host with room for a local port and
1014  *                      LLD private data
1015  * @sht:       The SCSI host template
1016  * @priv_size: Size of private data
1017  *
1018  * Returns: libfc lport
1019  */
1020 static inline struct fc_lport *
1021 libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
1022 {
1023         struct fc_lport *lport;
1024         struct Scsi_Host *shost;
1025
1026         shost = scsi_host_alloc(sht, sizeof(*lport) + priv_size);
1027         if (!shost)
1028                 return NULL;
1029         lport = shost_priv(shost);
1030         lport->host = shost;
1031         INIT_LIST_HEAD(&lport->ema_list);
1032         INIT_LIST_HEAD(&lport->vports);
1033         return lport;
1034 }
1035
1036 /*
1037  * FC_FCP HELPER FUNCTIONS
1038  *****************************/
1039 static inline bool fc_fcp_is_read(const struct fc_fcp_pkt *fsp)
1040 {
1041         if (fsp && fsp->cmd)
1042                 return fsp->cmd->sc_data_direction == DMA_FROM_DEVICE;
1043         return false;
1044 }
1045
1046 /*
1047  * LOCAL PORT LAYER
1048  *****************************/
1049 int fc_lport_init(struct fc_lport *);
1050 int fc_lport_destroy(struct fc_lport *);
1051 int fc_fabric_logoff(struct fc_lport *);
1052 int fc_fabric_login(struct fc_lport *);
1053 void __fc_linkup(struct fc_lport *);
1054 void fc_linkup(struct fc_lport *);
1055 void __fc_linkdown(struct fc_lport *);
1056 void fc_linkdown(struct fc_lport *);
1057 void fc_vport_setlink(struct fc_lport *);
1058 void fc_vports_linkchange(struct fc_lport *);
1059 int fc_lport_config(struct fc_lport *);
1060 int fc_lport_reset(struct fc_lport *);
1061 int fc_set_mfs(struct fc_lport *, u32 mfs);
1062 struct fc_lport *libfc_vport_create(struct fc_vport *, int privsize);
1063 struct fc_lport *fc_vport_id_lookup(struct fc_lport *, u32 port_id);
1064 int fc_lport_bsg_request(struct fc_bsg_job *);
1065 void fc_lport_set_local_id(struct fc_lport *, u32 port_id);
1066 void fc_lport_iterate(void (*func)(struct fc_lport *, void *), void *);
1067
1068 /*
1069  * REMOTE PORT LAYER
1070  *****************************/
1071 int fc_rport_init(struct fc_lport *);
1072 void fc_rport_terminate_io(struct fc_rport *);
1073
1074 /*
1075  * DISCOVERY LAYER
1076  *****************************/
1077 void fc_disc_init(struct fc_lport *);
1078 void fc_disc_config(struct fc_lport *, void *);
1079
1080 static inline struct fc_lport *fc_disc_lport(struct fc_disc *disc)
1081 {
1082         return container_of(disc, struct fc_lport, disc);
1083 }
1084
1085 /*
1086  * FCP LAYER
1087  *****************************/
1088 int fc_fcp_init(struct fc_lport *);
1089 void fc_fcp_destroy(struct fc_lport *);
1090
1091 /*
1092  * SCSI INTERACTION LAYER
1093  *****************************/
1094 int fc_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
1095 int fc_eh_abort(struct scsi_cmnd *);
1096 int fc_eh_device_reset(struct scsi_cmnd *);
1097 int fc_eh_host_reset(struct scsi_cmnd *);
1098 int fc_slave_alloc(struct scsi_device *);
1099 int fc_change_queue_depth(struct scsi_device *, int qdepth, int reason);
1100 int fc_change_queue_type(struct scsi_device *, int tag_type);
1101
1102 /*
1103  * ELS/CT interface
1104  *****************************/
1105 int fc_elsct_init(struct fc_lport *);
1106 struct fc_seq *fc_elsct_send(struct fc_lport *, u32 did,
1107                                     struct fc_frame *,
1108                                     unsigned int op,
1109                                     void (*resp)(struct fc_seq *,
1110                                                  struct fc_frame *,
1111                                                  void *arg),
1112                                     void *arg, u32 timer_msec);
1113 void fc_lport_flogi_resp(struct fc_seq *, struct fc_frame *, void *);
1114 void fc_lport_logo_resp(struct fc_seq *, struct fc_frame *, void *);
1115 void fc_fill_reply_hdr(struct fc_frame *, const struct fc_frame *,
1116                        enum fc_rctl, u32 parm_offset);
1117 void fc_fill_hdr(struct fc_frame *, const struct fc_frame *,
1118                  enum fc_rctl, u32 f_ctl, u16 seq_cnt, u32 parm_offset);
1119
1120
1121 /*
1122  * EXCHANGE MANAGER LAYER
1123  *****************************/
1124 int fc_exch_init(struct fc_lport *);
1125 void fc_exch_update_stats(struct fc_lport *lport);
1126 struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *,
1127                                            struct fc_exch_mgr *,
1128                                            bool (*match)(struct fc_frame *));
1129 void fc_exch_mgr_del(struct fc_exch_mgr_anchor *);
1130 int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst);
1131 struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *, enum fc_class class,
1132                                       u16 min_xid, u16 max_xid,
1133                                       bool (*match)(struct fc_frame *));
1134 void fc_exch_mgr_free(struct fc_lport *);
1135 void fc_exch_recv(struct fc_lport *, struct fc_frame *);
1136 void fc_exch_mgr_reset(struct fc_lport *, u32 s_id, u32 d_id);
1137
1138 /*
1139  * Functions for fc_functions_template
1140  */
1141 void fc_get_host_speed(struct Scsi_Host *);
1142 void fc_get_host_port_state(struct Scsi_Host *);
1143 void fc_set_rport_loss_tmo(struct fc_rport *, u32 timeout);
1144 struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *);
1145
1146 #endif /* _LIBFC_H_ */