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linux/include/scsi/libfc.h
Jeff Garzik f281233d3e SCSI host lock push-down 
Move the mid-layer's ->queuecommand() invocation from being locked
with the host lock to being unlocked to facilitate speeding up the
critical path for drivers who don't need this lock taken anyway.

The patch below presents a simple SCSI host lock push-down as an
equivalent transformation.  No locking or other behavior should change
with this patch.  All existing bugs and locking orders are preserved.

Additionally, add one parameter to queuecommand,
	struct Scsi_Host *
and remove one parameter from queuecommand,
	void (*done)(struct scsi_cmnd *)

Scsi_Host* is a convenient pointer that most host drivers need anyway,
and 'done' is redundant to struct scsi_cmnd->scsi_done.

Minimal code disturbance was attempted with this change.  Most drivers
needed only two one-line modifications for their host lock push-down.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Acked-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-16 13:33:23 -08:00

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/*
* Copyright(c) 2007 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* 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 <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_els.h>
#include <scsi/fc/fc_gs.h>
#include <scsi/fc_frame.h>
/*
* libfc error codes
*/
#define FC_NO_ERR 0 /* no error */
#define FC_EX_TIMEOUT 1 /* Exchange timeout */
#define FC_EX_CLOSED 2 /* Exchange closed */
/**
* 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_RPN_ID: Register port name by ID (RPN_ID) sent
* @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_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_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)
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
* @event_callback: Callback when READY, FAILED or LOGO states complete
* @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;
struct rcu_head rcu;
};
/**
* struct fcoe_dev_stats - fcoe 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
* @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
* @InputMegabytes: Number of received megabytes
* @OutputMegabytes: Number of transmitted megabytes
* @VLinkFailureCount: Number of virtual link failures
* @MissDiscAdvCount: Number of missing FIP discovery advertisement
*/
struct fcoe_dev_stats {
u64 SecondsSinceLastReset;
u64 TxFrames;
u64 TxWords;
u64 RxFrames;
u64 RxWords;
u64 ErrorFrames;
u64 DumpedFrames;
u64 LinkFailureCount;
u64 LossOfSignalCount;
u64 InvalidTxWordCount;
u64 InvalidCRCCount;
u64 InputRequests;
u64 OutputRequests;
u64 ControlRequests;
u64 InputMegabytes;
u64 OutputMegabytes;
u64 VLinkFailureCount;
u64 MissDiscAdvCount;
};
/**
* struct fc_seq_els_data - ELS data used for passing ELS specific responses
* @reason: The reason for rejection
* @explan: The explaination 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
* @tgt_flags: Target's flags
* @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)
* @start_time: Timestamp indicating the start of the I/O (in jiffies)
* @end_time: Timestamp indicating the end of the I/O (in jiffies)
* @last_pkt_time: Timestamp of the last frame received (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 {
/* Housekeeping information */
struct fc_lport *lp;
u16 state;
u16 tgt_flags;
atomic_t ref_cnt;
spinlock_t scsi_pkt_lock;
/* SCSI I/O related information */
struct scsi_cmnd *cmd;
struct list_head list;
/* Timeout related information */
struct timer_list timer;
struct completion tm_done;
int wait_for_comp;
unsigned long start_time;
unsigned long end_time;
unsigned long last_pkt_time;
/* SCSI command and data transfer information */
u32 data_len;
/* Transport related veriables */
struct fcp_cmnd cdb_cmd;
size_t xfer_len;
u16 xfer_ddp;
u32 xfer_contig_end;
u16 max_payload;
/* SCSI/FCP return status */
u32 io_status;
u8 cdb_status;
u8 status_code;
u8 scsi_comp_flags;
u32 req_flags;
u32 scsi_resid;
/* Associated structures */
struct fc_rport *rport;
struct fc_seq *seq_ptr;
/* Error Processing information */
u8 recov_retry;
struct fc_seq *recov_seq;
};
/*
* 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 */
/**
* 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: Resouce 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: 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 {
struct fc_exch_mgr *em;
struct fc_exch_pool *pool;
u32 state;
u16 xid;
struct list_head ex_list;
spinlock_t ex_lock;
atomic_t ex_refcnt;
struct delayed_work timeout_work;
struct fc_lport *lp;
u16 oxid;
u16 rxid;
u32 oid;
u32 sid;
u32 did;
u32 esb_stat;
u32 r_a_tov;
u8 seq_id;
u8 encaps;
u32 f_ctl;
u8 fh_type;
enum fc_class class;
struct fc_seq seq;
void (*resp)(struct fc_seq *, struct fc_frame *, void *);
void *arg;
void (*destructor)(struct fc_seq *, void *);
};
#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);
/*
* Send the FC frame payload using a new exchange and sequence.
*
* The exchange response handler is set in this routine to resp()
* function pointer. It can be called in two scenarios: if a timeout
* occurs or if a response frame is received for the exchange. The
* fc_frame pointer in response handler will also indicate timeout
* as error using IS_ERR related macros.
*
* The exchange destructor handler is also set in this routine.
* The destructor handler is invoked by EM layer when exchange
* is about to free, this can be used by caller to free its
* resources along with exchange free.
*
* The arg is passed back to resp and destructor handler.
*
* The timeout value (in msec) for an exchange is set if non zero
* timer_msec argument is specified. The timer is canceled when
* it fires or when the exchange is done. The exchange timeout handler
* is registered by EM layer.
*
* STATUS: OPTIONAL
*/
struct fc_seq *(*exch_seq_send)(struct fc_lport *, struct fc_frame *,
void (*resp)(struct fc_seq *,
struct fc_frame *,
void *),
void (*destructor)(struct fc_seq *,
void *),
void *, unsigned int 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);
/*
* Allow LLD to fill its own Link Error Status Block
*
* STATUS: OPTIONAL
*/
void (*get_lesb)(struct fc_lport *, struct fc_els_lesb *lesb);
/*
* Send a frame using an existing sequence and exchange.
*
* STATUS: OPTIONAL
*/
int (*seq_send)(struct fc_lport *, struct fc_seq *,
struct fc_frame *);
/*
* Send an ELS response using infomation from the received frame.
*
* STATUS: OPTIONAL
*/
void (*seq_els_rsp_send)(struct fc_frame *, enum fc_els_cmd,
struct fc_seq_els_data *);
/*
* Abort an exchange and sequence. Generally called because of a
* exchange timeout or an abort from the upper layer.
*
* A timer_msec can be specified for abort timeout, if non-zero
* timer_msec value is specified then exchange resp handler
* will be called with timeout error if no response to abort.
*
* STATUS: OPTIONAL
*/
int (*seq_exch_abort)(const struct fc_seq *,
unsigned int timer_msec);
/*
* Indicate that an exchange/sequence tuple is complete and the memory
* allocated for the related objects may be freed.
*
* STATUS: OPTIONAL
*/
void (*exch_done)(struct fc_seq *);
/*
* Start a new sequence on the same exchange/sequence tuple.
*
* STATUS: OPTIONAL
*/
struct fc_seq *(*seq_start_next)(struct fc_seq *);
/*
* Assign a sequence for an incoming request frame.
*
* STATUS: OPTIONAL
*/
struct fc_seq *(*seq_assign)(struct fc_lport *, struct fc_frame *);
/*
* 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);
/*
* Flush the rport work queue. Generally used before shutdown.
*
* STATUS: OPTIONAL
*/
void (*rport_flush_queue)(void);
/*
* Receive a frame for a local port.
*
* STATUS: OPTIONAL
*/
void (*lport_recv)(struct fc_lport *, struct fc_frame *);
/*
* Reset the local port.
*
* STATUS: OPTIONAL
*/
int (*lport_reset)(struct fc_lport *);
/*
* 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 *);
/*
* Create a remote port with a given port ID
*
* STATUS: OPTIONAL
*/
struct fc_rport_priv *(*rport_create)(struct fc_lport *, u32);
/*
* Initiates the RP state machine. It is called from the LP module.
* This function will issue the following commands to the N_Port
* identified by the FC ID provided.
*
* - PLOGI
* - PRLI
* - RTV
*
* STATUS: OPTIONAL
*/
int (*rport_login)(struct fc_rport_priv *);
/*
* Logoff, and remove the rport from the transport if
* it had been added. This will send a LOGO to the target.
*
* STATUS: OPTIONAL
*/
int (*rport_logoff)(struct fc_rport_priv *);
/*
* Recieve a request from a remote port.
*
* STATUS: OPTIONAL
*/
void (*rport_recv_req)(struct fc_lport *, struct fc_frame *);
/*
* lookup an rport by it's port ID.
*
* STATUS: OPTIONAL
*/
struct fc_rport_priv *(*rport_lookup)(const struct fc_lport *, u32);
/*
* Destroy an rport after final kref_put().
* The argument is a pointer to the kref inside the fc_rport_priv.
*/
void (*rport_destroy)(struct kref *);
/*
* 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 durring 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);
};
/**
* 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
* @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
* @dev_stats: FCoE device stats (TODO: libfc should not be
* FCoE aware)
* @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: Resouce 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: Handle for list of local ports
* @retry_work: Handle to local port for delayed retry context
*/
struct fc_lport {
/* Associations */
struct Scsi_Host *host;
struct list_head ema_list;
struct fc_rport_priv *dns_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;
enum fc_lport_state state;
unsigned long boot_time;
struct fc_host_statistics host_stats;
struct fcoe_dev_stats *dev_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 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;
};
/*
* FC_LPORT HELPER FUNCTIONS
*****************************/
/**
* fc_lport_test_ready() - Determine if a local port is in the READY state
* @lport: The local port to test
*/
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
* @wwnn: The new WWPN
*/
static inline void fc_set_wwpn(struct fc_lport *lport, u64 wwnn)
{
lport->wwpn = wwnn;
}
/**
* 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
*/
static inline int fc_lport_init_stats(struct fc_lport *lport)
{
lport->dev_stats = alloc_percpu(struct fcoe_dev_stats);
if (!lport->dev_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->dev_stats);
}
/**
* lport_priv() - Return the private data from a local port
* @lport: The local port whose private data is to be retreived
*/
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(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 *);
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 fc_bsg_job *);
void fc_lport_set_local_id(struct fc_lport *, u32 port_id);
/*
* REMOTE PORT LAYER
*****************************/
int fc_rport_init(struct fc_lport *);
void fc_rport_terminate_io(struct fc_rport *);
/*
* DISCOVERY LAYER
*****************************/
int fc_disc_init(struct fc_lport *);
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_slave_alloc(struct scsi_device *);
int fc_change_queue_depth(struct scsi_device *, int qdepth, int reason);
int fc_change_queue_type(struct scsi_device *, int tag_type);
/*
* 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 *);
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);
/*
* 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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