/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright(c) 2007 Intel Corporation. All rights reserved. * * Maintained at www.Open-FCoE.org */ #ifndef _LIBFC_H_ #define _LIBFC_H_ #include <linux/timer.h> #include <linux/if.h> #include <linux/percpu.h> #include <linux/refcount.h> #include <scsi/scsi_transport.h> #include <scsi/scsi_transport_fc.h> #include <scsi/scsi_bsg_fc.h> #include <scsi/fc/fc_fcp.h> #include <scsi/fc/fc_ns.h> #include <scsi/fc/fc_ms.h> #include <scsi/fc/fc_els.h> #include <scsi/fc/fc_gs.h> #include <scsi/fc_frame.h> #define FC_FC4_PROV_SIZE … /* * libfc error codes */ #define FC_NO_ERR … #define FC_EX_TIMEOUT … #define FC_EX_CLOSED … #define FC_EX_ALLOC_ERR … #define FC_EX_XMIT_ERR … #define FC_EX_ELS_RJT … #define FC_EX_INV_LOGIN … #define FC_EX_SEQ_ERR … /** * enum fc_lport_state - Local port states * @LPORT_ST_DISABLED: Disabled * @LPORT_ST_FLOGI: Fabric login (FLOGI) sent * @LPORT_ST_DNS: Waiting for name server remote port to become ready * @LPORT_ST_RNN_ID: Register port name by ID (RNN_ID) sent * @LPORT_ST_RSNN_NN: Waiting for host symbolic node name * @LPORT_ST_RSPN_ID: Waiting for host symbolic port name * @LPORT_ST_RFT_ID: Register Fibre Channel types by ID (RFT_ID) sent * @LPORT_ST_RFF_ID: Register FC-4 Features by ID (RFF_ID) sent * @LPORT_ST_FDMI: Waiting for mgmt server rport to become ready * @LPORT_ST_RHBA: Register HBA * @LPORT_ST_RPA: Register Port Attributes * @LPORT_ST_DHBA: Deregister HBA * @LPORT_ST_DPRT: Deregister Port * @LPORT_ST_SCR: State Change Register (SCR) sent * @LPORT_ST_READY: Ready for use * @LPORT_ST_LOGO: Local port logout (LOGO) sent * @LPORT_ST_RESET: Local port reset */ enum fc_lport_state { … }; enum fc_disc_event { … }; /** * enum fc_rport_state - Remote port states * @RPORT_ST_INIT: Initialized * @RPORT_ST_FLOGI: Waiting for FLOGI completion for point-to-multipoint * @RPORT_ST_PLOGI_WAIT: Waiting for peer to login for point-to-multipoint * @RPORT_ST_PLOGI: Waiting for PLOGI completion * @RPORT_ST_PRLI: Waiting for PRLI completion * @RPORT_ST_RTV: Waiting for RTV completion * @RPORT_ST_READY: Ready for use * @RPORT_ST_ADISC: Discover Address sent * @RPORT_ST_DELETE: Remote port being deleted */ enum fc_rport_state { … }; /** * struct fc_disc_port - temporary discovery port to hold rport identifiers * @lp: Fibre Channel host port instance * @peers: Node for list management during discovery and RSCN processing * @rport_work: Work struct for starting the rport state machine * @port_id: Port ID of the discovered port */ struct fc_disc_port { … }; /** * enum fc_rport_event - Remote port events * @RPORT_EV_NONE: No event * @RPORT_EV_READY: Remote port is ready for use * @RPORT_EV_FAILED: State machine failed, remote port is not ready * @RPORT_EV_STOP: Remote port has been stopped * @RPORT_EV_LOGO: Remote port logout (LOGO) sent */ enum fc_rport_event { … }; struct fc_rport_priv; /** * struct fc_rport_operations - Operations for a remote port * @event_callback: Function to be called for remote port events */ struct fc_rport_operations { … }; /** * struct fc_rport_libfc_priv - libfc internal information about a remote port * @local_port: The associated local port * @rp_state: Indicates READY for I/O or DELETE when blocked * @flags: REC and RETRY supported flags * @e_d_tov: Error detect timeout value (in msec) * @r_a_tov: Resource allocation timeout value (in msec) */ struct fc_rport_libfc_priv { … }; /** * struct fc_rport_priv - libfc remote port and discovery info * @local_port: The associated local port * @rport: The FC transport remote port * @kref: Reference counter * @rp_state: Enumeration that tracks progress of PLOGI, PRLI, * and RTV exchanges * @ids: The remote port identifiers and roles * @flags: STARTED, REC and RETRY_SUPPORTED flags * @max_seq: Maximum number of concurrent sequences * @disc_id: The discovery identifier * @maxframe_size: The maximum frame size * @retries: The retry count for the current state * @major_retries: The retry count for the entire PLOGI/PRLI state machine * @e_d_tov: Error detect timeout value (in msec) * @r_a_tov: Resource allocation timeout value (in msec) * @rp_mutex: The mutex that protects the remote port * @retry_work: Handle for retries * @lld_event_callback: Callback when READY, FAILED or LOGO states complete * @prli_count: Count of open PRLI sessions in providers * @rcu: Structure used for freeing in an RCU-safe manner */ struct fc_rport_priv { … }; /** * struct fc_stats - fc stats structure * @SecondsSinceLastReset: Seconds since the last reset * @TxFrames: Number of transmitted frames * @TxWords: Number of transmitted words * @RxFrames: Number of received frames * @RxWords: Number of received words * @ErrorFrames: Number of received error frames * @DumpedFrames: Number of dumped frames * @FcpPktAllocFails: Number of fcp packet allocation failures * @FcpPktAborts: Number of fcp packet aborts * @FcpFrameAllocFails: Number of fcp frame allocation failures * @LinkFailureCount: Number of link failures * @LossOfSignalCount: Number for signal losses * @InvalidTxWordCount: Number of invalid transmitted words * @InvalidCRCCount: Number of invalid CRCs * @InputRequests: Number of input requests * @OutputRequests: Number of output requests * @ControlRequests: Number of control requests * @InputBytes: Number of received bytes * @OutputBytes: Number of transmitted bytes * @VLinkFailureCount: Number of virtual link failures * @MissDiscAdvCount: Number of missing FIP discovery advertisement */ struct fc_stats { … }; /** * struct fc_seq_els_data - ELS data used for passing ELS specific responses * @reason: The reason for rejection * @explan: The explanation of the rejection * * Mainly used by the exchange manager layer. */ struct fc_seq_els_data { … }; /** * struct fc_fcp_pkt - FCP request structure (one for each scsi_cmnd request) * @lp: The associated local port * @state: The state of the I/O * @ref_cnt: Reference count * @scsi_pkt_lock: Lock to protect the SCSI packet (must be taken before the * host_lock if both are to be held at the same time) * @cmd: The SCSI command (set and clear with the host_lock held) * @list: Tracks queued commands (accessed with the host_lock held) * @timer: The command timer * @tm_done: Completion indicator * @wait_for_comp: Indicator to wait for completion of the I/O (in jiffies) * @timer_delay: FCP packet timer delay in jiffies * @data_len: The length of the data * @cdb_cmd: The CDB command * @xfer_len: The transfer length * @xfer_ddp: Indicates if this transfer used DDP (XID of the exchange * will be set here if DDP was setup) * @xfer_contig_end: The offset into the buffer if the buffer is contiguous * (Tx and Rx) * @max_payload: The maximum payload size (in bytes) * @io_status: SCSI result (upper 24 bits) * @cdb_status: CDB status * @status_code: FCP I/O status * @scsi_comp_flags: Completion flags (bit 3 Underrun bit 2: overrun) * @req_flags: Request flags (bit 0: read bit:1 write) * @scsi_resid: SCSI residule length * @rport: The remote port that the SCSI command is targeted at * @seq_ptr: The sequence that will carry the SCSI command * @recov_retry: Number of recovery retries * @recov_seq: The sequence for REC or SRR */ struct fc_fcp_pkt { … } ____cacheline_aligned_in_smp; /* * @fsp should be tested and set under the scsi_pkt_queue lock */ struct libfc_cmd_priv { … }; /* * Structure and function definitions for managing Fibre Channel Exchanges * and Sequences * * fc_exch holds state for one exchange and links to its active sequence. * * fc_seq holds the state for an individual sequence. */ struct fc_exch_mgr; struct fc_exch_mgr_anchor; extern u16 fc_cpu_mask; /* cpu mask for possible cpus */ /** * struct fc_seq - FC sequence * @id: The sequence ID * @ssb_stat: Status flags for the sequence status block (SSB) * @cnt: Number of frames sent so far * @rec_data: FC-4 value for REC */ struct fc_seq { … }; #define FC_EX_DONE … #define FC_EX_RST_CLEANUP … #define FC_EX_QUARANTINE … /** * struct fc_exch - Fibre Channel Exchange * @em: Exchange manager * @pool: Exchange pool * @state: The exchange's state * @xid: The exchange ID * @ex_list: Handle used by the EM to track free exchanges * @ex_lock: Lock that protects the exchange * @ex_refcnt: Reference count * @timeout_work: Handle for timeout handler * @lp: The local port that this exchange is on * @oxid: Originator's exchange ID * @rxid: Responder's exchange ID * @oid: Originator's FCID * @sid: Source FCID * @did: Destination FCID * @esb_stat: ESB exchange status * @r_a_tov: Resource allocation time out value (in msecs) * @seq_id: The next sequence ID to use * @encaps: encapsulation information for lower-level driver * @f_ctl: F_CTL flags for the sequence * @fh_type: The frame type * @class: The class of service * @seq: The sequence in use on this exchange * @resp_active: Number of tasks that are concurrently executing @resp(). * @resp_task: If @resp_active > 0, either the task executing @resp(), the * task that has been interrupted to execute the soft-IRQ * executing @resp() or NULL if more than one task is executing * @resp concurrently. * @resp_wq: Waitqueue for the tasks waiting on @resp_active. * @resp: Callback for responses on this exchange * @destructor: Called when destroying the exchange * @arg: Passed as a void pointer to the resp() callback * * Locking notes: The ex_lock protects following items: * state, esb_stat, f_ctl, seq.ssb_stat * seq_id * sequence allocation */ struct fc_exch { … } ____cacheline_aligned_in_smp; #define fc_seq_exch(sp) … struct libfc_function_template { … }; /** * struct fc_disc - Discovery context * @retry_count: Number of retries * @pending: 1 if discovery is pending, 0 if not * @requested: 1 if discovery has been requested, 0 if not * @seq_count: Number of sequences used for discovery * @buf_len: Length of the discovery buffer * @disc_id: Discovery ID * @rports: List of discovered remote ports * @priv: Private pointer for use by discovery code * @disc_mutex: Mutex that protects the discovery context * @partial_buf: Partial name buffer (if names are returned * in multiple frames) * @disc_work: handle for delayed work context * @disc_callback: Callback routine called when discovery completes */ struct fc_disc { … }; /* * Local port notifier and events. */ extern struct blocking_notifier_head fc_lport_notifier_head; enum fc_lport_event { … }; /** * struct fc_lport - Local port * @host: The SCSI host associated with a local port * @ema_list: Exchange manager anchor list * @dns_rdata: The directory server remote port * @ms_rdata: The management server remote port * @ptp_rdata: Point to point remote port * @scsi_priv: FCP layer internal data * @disc: Discovery context * @vports: Child vports if N_Port * @vport: Parent vport if VN_Port * @tt: Libfc function template * @link_up: Link state (1 = link up, 0 = link down) * @qfull: Queue state (1 queue is full, 0 queue is not full) * @state: Identifies the state * @boot_time: Timestamp indicating when the local port came online * @host_stats: SCSI host statistics * @stats: FC local port stats (TODO separate libfc LLD stats) * @retry_count: Number of retries in the current state * @port_id: FC Port ID * @wwpn: World Wide Port Name * @wwnn: World Wide Node Name * @service_params: Common service parameters * @e_d_tov: Error detection timeout value * @r_a_tov: Resource allocation timeout value * @rnid_gen: RNID information * @sg_supp: Indicates if scatter gather is supported * @seq_offload: Indicates if sequence offload is supported * @crc_offload: Indicates if CRC offload is supported * @lro_enabled: Indicates if large receive offload is supported * @does_npiv: Supports multiple vports * @npiv_enabled: Switch/fabric allows NPIV * @mfs: The maximum Fibre Channel payload size * @max_retry_count: The maximum retry attempts * @max_rport_retry_count: The maximum remote port retry attempts * @rport_priv_size: Size needed by driver after struct fc_rport_priv * @lro_xid: The maximum XID for LRO * @lso_max: The maximum large offload send size * @fcts: FC-4 type mask * @lp_mutex: Mutex to protect the local port * @list: Linkage on list of vport peers * @retry_work: Handle to local port for delayed retry context * @prov: Pointers available for use by passive FC-4 providers * @lport_list: Linkage on module-wide list of local ports */ struct fc_lport { … }; /** * struct fc4_prov - FC-4 provider registration * @prli: Handler for incoming PRLI * @prlo: Handler for session reset * @recv: Handler for incoming request * @module: Pointer to module. May be NULL. */ struct fc4_prov { … }; /* * Register FC-4 provider with libfc. */ int fc_fc4_register_provider(enum fc_fh_type type, struct fc4_prov *); void fc_fc4_deregister_provider(enum fc_fh_type type, struct fc4_prov *); /* * FC_LPORT HELPER FUNCTIONS *****************************/ /** * fc_lport_test_ready() - Determine if a local port is in the READY state * @lport: The local port to test * * Returns: %true if local port is in the READY state, %false otherwise */ static inline int fc_lport_test_ready(struct fc_lport *lport) { … } /** * fc_set_wwnn() - Set the World Wide Node Name of a local port * @lport: The local port whose WWNN is to be set * @wwnn: The new WWNN */ static inline void fc_set_wwnn(struct fc_lport *lport, u64 wwnn) { … } /** * fc_set_wwpn() - Set the World Wide Port Name of a local port * @lport: The local port whose WWPN is to be set * @wwpn: The new WWPN */ static inline void fc_set_wwpn(struct fc_lport *lport, u64 wwpn) { … } /** * fc_lport_state_enter() - Change a local port's state * @lport: The local port whose state is to change * @state: The new state */ static inline void fc_lport_state_enter(struct fc_lport *lport, enum fc_lport_state state) { … } /** * fc_lport_init_stats() - Allocate per-CPU statistics for a local port * @lport: The local port whose statistics are to be initialized * * Returns: %0 on success, %-ENOMEM on failure */ static inline int fc_lport_init_stats(struct fc_lport *lport) { … } /** * fc_lport_free_stats() - Free memory for a local port's statistics * @lport: The local port whose statistics are to be freed */ static inline void fc_lport_free_stats(struct fc_lport *lport) { … } /** * lport_priv() - Return the private data from a local port * @lport: The local port whose private data is to be retrieved * * Returns: the local port's private data pointer */ static inline void *lport_priv(const struct fc_lport *lport) { … } /** * libfc_host_alloc() - Allocate a Scsi_Host with room for a local port and * LLD private data * @sht: The SCSI host template * @priv_size: Size of private data * * Returns: libfc lport */ static inline struct fc_lport * libfc_host_alloc(const struct scsi_host_template *sht, int priv_size) { … } /* * FC_FCP HELPER FUNCTIONS *****************************/ static inline bool fc_fcp_is_read(const struct fc_fcp_pkt *fsp) { … } /* * LOCAL PORT LAYER *****************************/ int fc_lport_init(struct fc_lport *); int fc_lport_destroy(struct fc_lport *); int fc_fabric_logoff(struct fc_lport *); int fc_fabric_login(struct fc_lport *); void __fc_linkup(struct fc_lport *); void fc_linkup(struct fc_lport *); void __fc_linkdown(struct fc_lport *); void fc_linkdown(struct fc_lport *); void fc_vport_setlink(struct fc_lport *); void fc_vports_linkchange(struct fc_lport *); int fc_lport_config(struct fc_lport *); int fc_lport_reset(struct fc_lport *); void fc_lport_recv(struct fc_lport *lport, struct fc_frame *fp); int fc_set_mfs(struct fc_lport *, u32 mfs); struct fc_lport *libfc_vport_create(struct fc_vport *, int privsize); struct fc_lport *fc_vport_id_lookup(struct fc_lport *, u32 port_id); int fc_lport_bsg_request(struct bsg_job *); void fc_lport_set_local_id(struct fc_lport *, u32 port_id); void fc_lport_iterate(void (*func)(struct fc_lport *, void *), void *); /* * REMOTE PORT LAYER *****************************/ void fc_rport_terminate_io(struct fc_rport *); struct fc_rport_priv *fc_rport_lookup(const struct fc_lport *lport, u32 port_id); struct fc_rport_priv *fc_rport_create(struct fc_lport *, u32); void fc_rport_destroy(struct kref *kref); int fc_rport_login(struct fc_rport_priv *rdata); int fc_rport_logoff(struct fc_rport_priv *rdata); void fc_rport_recv_req(struct fc_lport *lport, struct fc_frame *fp); void fc_rport_flush_queue(void); /* * DISCOVERY LAYER *****************************/ void fc_disc_init(struct fc_lport *); void fc_disc_config(struct fc_lport *, void *); static inline struct fc_lport *fc_disc_lport(struct fc_disc *disc) { … } /* * FCP LAYER *****************************/ int fc_fcp_init(struct fc_lport *); void fc_fcp_destroy(struct fc_lport *); /* * SCSI INTERACTION LAYER *****************************/ int fc_queuecommand(struct Scsi_Host *, struct scsi_cmnd *); int fc_eh_abort(struct scsi_cmnd *); int fc_eh_device_reset(struct scsi_cmnd *); int fc_eh_host_reset(struct scsi_cmnd *); int fc_slave_alloc(struct scsi_device *); /* * ELS/CT interface *****************************/ int fc_elsct_init(struct fc_lport *); struct fc_seq *fc_elsct_send(struct fc_lport *, u32 did, struct fc_frame *, unsigned int op, void (*resp)(struct fc_seq *, struct fc_frame *, void *arg), void *arg, u32 timer_msec); void fc_lport_flogi_resp(struct fc_seq *, struct fc_frame *, void *); void fc_lport_logo_resp(struct fc_seq *, struct fc_frame *, void *); void fc_fill_reply_hdr(struct fc_frame *, const struct fc_frame *, enum fc_rctl, u32 parm_offset); void fc_fill_hdr(struct fc_frame *, const struct fc_frame *, enum fc_rctl, u32 f_ctl, u16 seq_cnt, u32 parm_offset); /* * EXCHANGE MANAGER LAYER *****************************/ int fc_exch_init(struct fc_lport *); void fc_exch_update_stats(struct fc_lport *lport); struct fc_seq *fc_exch_seq_send(struct fc_lport *lport, struct fc_frame *fp, void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg), void (*destructor)(struct fc_seq *, void *), void *arg, u32 timer_msec); void fc_seq_els_rsp_send(struct fc_frame *, enum fc_els_cmd, struct fc_seq_els_data *); struct fc_seq *fc_seq_start_next(struct fc_seq *sp); void fc_seq_set_resp(struct fc_seq *sp, void (*resp)(struct fc_seq *, struct fc_frame *, void *), void *arg); struct fc_seq *fc_seq_assign(struct fc_lport *lport, struct fc_frame *fp); void fc_seq_release(struct fc_seq *sp); struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *, struct fc_exch_mgr *, bool (*match)(struct fc_frame *)); void fc_exch_mgr_del(struct fc_exch_mgr_anchor *); int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst); struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *, enum fc_class class, u16 min_xid, u16 max_xid, bool (*match)(struct fc_frame *)); void fc_exch_mgr_free(struct fc_lport *); void fc_exch_recv(struct fc_lport *, struct fc_frame *); void fc_exch_mgr_reset(struct fc_lport *, u32 s_id, u32 d_id); int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp, struct fc_frame *fp); int fc_seq_exch_abort(const struct fc_seq *, unsigned int timer_msec); void fc_exch_done(struct fc_seq *sp); /* * Functions for fc_functions_template */ void fc_get_host_speed(struct Scsi_Host *); void fc_get_host_port_state(struct Scsi_Host *); void fc_set_rport_loss_tmo(struct fc_rport *, u32 timeout); struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *); #endif /* _LIBFC_H_ */
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