/* 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 (FC_TYPE_FCP + 1 ) /* size of tables */
/*
* libfc error codes
*/
#define FC_NO_ERR 0 /* no error */
#define FC_EX_TIMEOUT 1 /* Exchange timeout */
#define FC_EX_CLOSED 2 /* Exchange closed */
#define FC_EX_ALLOC_ERR 3 /* Exchange allocation failed */
#define FC_EX_XMIT_ERR 4 /* Exchange transmit failed */
#define FC_EX_ELS_RJT 5 /* ELS rejected */
#define FC_EX_INV_LOGIN 6 /* Login not completed */
#define FC_EX_SEQ_ERR 6 /* Exchange sequence error */
/**
* 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 {
LPORT_ST_DISABLED = 0 ,
LPORT_ST_FLOGI,
LPORT_ST_DNS,
LPORT_ST_RNN_ID,
LPORT_ST_RSNN_NN,
LPORT_ST_RSPN_ID,
LPORT_ST_RFT_ID,
LPORT_ST_RFF_ID,
LPORT_ST_FDMI,
LPORT_ST_RHBA,
LPORT_ST_RPA,
LPORT_ST_DHBA,
LPORT_ST_DPRT,
LPORT_ST_SCR,
LPORT_ST_READY,
LPORT_ST_LOGO,
LPORT_ST_RESET
};
enum fc_disc_event {
DISC_EV_NONE = 0 ,
DISC_EV_SUCCESS,
DISC_EV_FAILED
};
/**
* 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 {
RPORT_ST_INIT,
RPORT_ST_FLOGI,
RPORT_ST_PLOGI_WAIT,
RPORT_ST_PLOGI,
RPORT_ST_PRLI,
RPORT_ST_RTV,
RPORT_ST_READY,
RPORT_ST_ADISC,
RPORT_ST_DELETE,
};
/**
* 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 {
struct fc_lport *lp;
struct list_head peers;
struct work_struct rport_work;
u32 port_id;
};
/**
* 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 {
RPORT_EV_NONE = 0 ,
RPORT_EV_READY,
RPORT_EV_FAILED,
RPORT_EV_STOP,
RPORT_EV_LOGO
};
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 {
void (*event_callback)(struct fc_lport *, struct fc_rport_priv *,
enum fc_rport_event);
};
/**
* 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_lport *local_port;
enum fc_rport_state rp_state;
u16 flags;
#define FC_RP_FLAGS_REC_SUPPORTED (1 << 0 )
#define FC_RP_FLAGS_RETRY (1 << 1 )
#define FC_RP_STARTED (1 << 2 )
#define FC_RP_FLAGS_CONF_REQ (1 << 3 )
unsigned int e_d_tov;
unsigned int r_a_tov;
};
/**
* 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_lport *local_port;
struct fc_rport *rport;
struct kref kref;
enum fc_rport_state rp_state;
struct fc_rport_identifiers ids;
u16 flags;
u16 max_seq;
u16 disc_id;
u16 maxframe_size;
unsigned int retries;
unsigned int major_retries;
unsigned int e_d_tov;
unsigned int r_a_tov;
struct mutex rp_mutex;
struct delayed_work retry_work;
enum fc_rport_event event;
struct fc_rport_operations *ops;
struct list_head peers;
struct work_struct event_work;
u32 supported_classes;
u16 prli_count;
struct rcu_head rcu;
u16 sp_features;
u8 spp_type;
void (*lld_event_callback)(struct fc_lport *,
struct fc_rport_priv *,
enum fc_rport_event);
};
/**
* 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 {
u64 SecondsSinceLastReset;
u64 TxFrames;
u64 TxWords;
u64 RxFrames;
u64 RxWords;
u64 ErrorFrames;
u64 DumpedFrames;
u64 FcpPktAllocFails;
u64 FcpPktAborts;
u64 FcpFrameAllocFails;
u64 LinkFailureCount;
u64 LossOfSignalCount;
u64 InvalidTxWordCount;
u64 InvalidCRCCount;
u64 InputRequests;
u64 OutputRequests;
u64 ControlRequests;
u64 InputBytes;
u64 OutputBytes;
u64 VLinkFailureCount;
u64 MissDiscAdvCount;
};
/**
* 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 {
enum fc_els_rjt_reason reason;
enum fc_els_rjt_explan explan;
};
/**
* 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 {
spinlock_t scsi_pkt_lock;
refcount_t ref_cnt;
/* SCSI command and data transfer information */
u32 data_len;
/* SCSI I/O related information */
struct scsi_cmnd *cmd;
struct list_head list;
/* Housekeeping information */
struct fc_lport *lp;
u8 state;
/* SCSI/FCP return status */
u8 cdb_status;
u8 status_code;
u8 scsi_comp_flags;
u32 io_status;
u32 req_flags;
u32 scsi_resid;
/* Transport related veriables */
size_t xfer_len;
struct fcp_cmnd cdb_cmd;
u32 xfer_contig_end;
u16 max_payload;
u16 xfer_ddp;
/* Associated structures */
struct fc_rport *rport;
struct fc_seq *seq_ptr;
/* Timeout/error related information */
struct timer_list timer;
int wait_for_comp;
int timer_delay;
u32 recov_retry;
struct fc_seq *recov_seq;
struct completion tm_done;
} ____cacheline_aligned_in_smp;
/*
* @ fsp should be tested and set under the scsi_pkt_queue lock
*/
struct libfc_cmd_priv {
struct fc_fcp_pkt *fsp;
u32 resid_len;
u8 status;
};
/*
* 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 {
u8 id;
u16 ssb_stat;
u16 cnt;
u32 rec_data;
};
#define FC_EX_DONE (1 << 0 ) /* ep is completed */
#define FC_EX_RST_CLEANUP (1 << 1 ) /* reset is forcing completion */
#define FC_EX_QUARANTINE (1 << 2 ) /* exch is quarantined */
/**
* 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 {
spinlock_t ex_lock;
atomic_t ex_refcnt;
enum fc_class class ;
struct fc_exch_mgr *em;
struct fc_exch_pool *pool;
struct list_head ex_list;
struct fc_lport *lp;
u32 esb_stat;
u8 state;
u8 fh_type;
u8 seq_id;
u8 encaps;
u16 xid;
u16 oxid;
u16 rxid;
u32 oid;
u32 sid;
u32 did;
u32 r_a_tov;
u32 f_ctl;
struct fc_seq seq;
int resp_active;
struct task_struct *resp_task;
wait_queue_head_t resp_wq;
void (*resp)(struct fc_seq *, struct fc_frame *, void *);
void *arg;
void (*destructor)(struct fc_seq *, void *);
struct delayed_work timeout_work;
} ____cacheline_aligned_in_smp;
#define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
struct libfc_function_template {
/*
* Interface to send a FC frame
*
* STATUS : REQUIRED
*/
int (*frame_send)(struct fc_lport *, struct fc_frame *);
/*
* Interface to send ELS / CT frames
*
* STATUS : OPTIONAL
*/
struct fc_seq *(*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);
/*
* Sets up the DDP context for a given exchange id on the given
* scatterlist if LLD supports DDP for large receive .
*
* STATUS : OPTIONAL
*/
int (*ddp_setup)(struct fc_lport *, u16, struct scatterlist *,
unsigned int );
/*
* Completes the DDP transfer and returns the length of data DDPed
* for the given exchange id .
*
* STATUS : OPTIONAL
*/
int (*ddp_done)(struct fc_lport *, u16);
/*
* Sets up the DDP context for a given exchange id on the given
* scatterlist if LLD supports DDP for target .
*
* STATUS : OPTIONAL
*/
int (*ddp_target)(struct fc_lport *, u16, struct scatterlist *,
unsigned int );
/*
* Allow LLD to fill its own Link Error Status Block
*
* STATUS : OPTIONAL
*/
void (*get_lesb)(struct fc_lport *, struct fc_els_lesb *lesb);
/*
* Reset an exchange manager , completing all sequences and exchanges .
* If s_id is non - zero , reset only exchanges originating from that FID .
* If d_id is non - zero , reset only exchanges sending to that FID .
*
* STATUS : OPTIONAL
*/
void (*exch_mgr_reset)(struct fc_lport *, u32 s_id, u32 d_id);
/*
* Set the local port FC_ID .
*
* This may be provided by the LLD to allow it to be
* notified when the local port is assigned a FC - ID .
*
* The frame , if non - NULL , is the incoming frame with the
* FLOGI LS_ACC or FLOGI , and may contain the granted MAC
* address for the LLD . The frame pointer may be NULL if
* no MAC is associated with this assignment ( LOGO or PLOGI ) .
*
* If FC_ID is non - zero , r_a_tov and e_d_tov must be valid .
*
* Note : this is called with the local port mutex held .
*
* STATUS : OPTIONAL
*/
void (*lport_set_port_id)(struct fc_lport *, u32 port_id,
struct fc_frame *);
/*
* Callback routine after the remote port is logged in
*
* STATUS : OPTIONAL
*/
void (*rport_event_callback)(struct fc_lport *,
struct fc_rport_priv *,
enum fc_rport_event);
/*
* Send a fcp cmd from fsp pkt .
* Called with the SCSI host lock unlocked and irqs disabled .
*
* The resp handler is called when FCP_RSP received .
*
* STATUS : OPTIONAL
*/
int (*fcp_cmd_send)(struct fc_lport *, struct fc_fcp_pkt *,
void (*resp)(struct fc_seq *, struct fc_frame *,
void *));
/*
* Cleanup the FCP layer , used during link down and reset
*
* STATUS : OPTIONAL
*/
void (*fcp_cleanup)(struct fc_lport *);
/*
* Abort all I / O on a local port
*
* STATUS : OPTIONAL
*/
void (*fcp_abort_io)(struct fc_lport *);
/*
* Receive a request for the discovery layer .
*
* STATUS : OPTIONAL
*/
void (*disc_recv_req)(struct fc_lport *, struct fc_frame *);
/*
* Start discovery for a local port .
*
* STATUS : OPTIONAL
*/
void (*disc_start)(void (*disc_callback)(struct fc_lport *,
enum fc_disc_event),
struct fc_lport *);
/*
* Stop discovery for a given lport . This will remove
* all discovered rports
*
* STATUS : OPTIONAL
*/
void (*disc_stop) (struct fc_lport *);
/*
* Stop discovery for a given lport . This will block
* until all discovered rports are deleted from the
* FC transport class
*
* STATUS : OPTIONAL
*/
void (*disc_stop_final) (struct fc_lport *);
};
/**
* 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 {
unsigned char retry_count;
unsigned char pending;
unsigned char requested;
unsigned short seq_count;
unsigned char buf_len;
u16 disc_id;
struct list_head rports;
void *priv;
struct mutex disc_mutex;
struct fc_gpn_ft_resp partial_buf;
struct delayed_work disc_work;
void (*disc_callback)(struct fc_lport *,
enum fc_disc_event);
};
/*
* Local port notifier and events .
*/
extern struct blocking_notifier_head fc_lport_notifier_head;
enum fc_lport_event {
FC_LPORT_EV_ADD,
FC_LPORT_EV_DEL,
};
/**
* 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 {
/* Associations */
struct Scsi_Host *host;
struct list_head ema_list;
struct fc_rport_priv *dns_rdata;
struct fc_rport_priv *ms_rdata;
struct fc_rport_priv *ptp_rdata;
void *scsi_priv;
struct fc_disc disc;
/* Virtual port information */
struct list_head vports;
struct fc_vport *vport;
/* Operational Information */
struct libfc_function_template tt;
u8 link_up;
u8 qfull;
u16 vlan;
enum fc_lport_state state;
unsigned long boot_time;
struct fc_host_statistics host_stats;
struct fc_stats __percpu *stats;
u8 retry_count;
/* Fabric information */
u32 port_id;
u64 wwpn;
u64 wwnn;
unsigned int service_params;
unsigned int e_d_tov;
unsigned int r_a_tov;
struct fc_els_rnid_gen rnid_gen;
/* Capabilities */
u32 sg_supp:1 ;
u32 seq_offload:1 ;
u32 crc_offload:1 ;
u32 lro_enabled:1 ;
u32 does_npiv:1 ;
u32 npiv_enabled:1 ;
u32 point_to_multipoint:1 ;
u32 fdmi_enabled:1 ;
u32 mfs;
u8 max_retry_count;
u8 max_rport_retry_count;
u16 rport_priv_size;
u16 link_speed;
u16 link_supported_speeds;
u16 lro_xid;
unsigned int lso_max;
struct fc_ns_fts fcts;
/* Miscellaneous */
struct mutex lp_mutex;
struct list_head list;
struct delayed_work retry_work;
void *prov[FC_FC4_PROV_SIZE];
struct list_head lport_list;
};
/**
* 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 {
int (*prli)(struct fc_rport_priv *, u32 spp_len,
const struct fc_els_spp *spp_in,
struct fc_els_spp *spp_out);
void (*prlo)(struct fc_rport_priv *);
void (*recv)(struct fc_lport *, struct fc_frame *);
struct module *module;
};
/*
* 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)
{
return lport->state == LPORT_ST_READY;
}
/**
* 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)
{
lport->wwnn = 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)
{
lport->wwpn = 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)
{
if (state != lport->state)
lport->retry_count = 0 ;
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)
{
lport->stats = alloc_percpu(struct fc_stats);
if (!lport->stats)
return -ENOMEM;
return 0 ;
}
/**
* 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)
{
free_percpu(lport->stats);
}
/**
* 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)
{
return (void *)(lport + 1 );
}
/**
* 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)
{
struct fc_lport *lport;
struct Scsi_Host *shost;
shost = scsi_host_alloc(sht, sizeof (*lport) + priv_size);
if (!shost)
return NULL;
lport = shost_priv(shost);
lport->host = shost;
INIT_LIST_HEAD(&lport->ema_list);
INIT_LIST_HEAD(&lport->vports);
return lport;
}
/*
* FC_FCP HELPER FUNCTIONS
*****************************/
static inline bool fc_fcp_is_read(const struct fc_fcp_pkt *fsp)
{
if (fsp && fsp->cmd)
return fsp->cmd->sc_data_direction == DMA_FROM_DEVICE;
return false ;
}
/*
* 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)
{
return container_of(disc, struct fc_lport, 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_sdev_init(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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(vorverarbeitet am 2026-09-28)
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