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