libfc.h 30.8 KB
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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>
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#include <linux/percpu.h>
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#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
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#include <scsi/scsi_bsg_fc.h>
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#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 */

/* some helpful macros */

#define ntohll(x) be64_to_cpu(x)
#define htonll(x) cpu_to_be64(x)


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static inline u32 ntoh24(const u8 *p)
{
	return (p[0] << 16) | (p[1] << 8) | p[2];
}

static inline void hton24(u8 *p, u32 v)
{
	p[0] = (v >> 16) & 0xff;
	p[1] = (v >> 8) & 0xff;
	p[2] = v & 0xff;
}
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/**
 * 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
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 * @LPORT_ST_RFF_ID:   Register FC-4 Features by ID (RFF_ID) sent
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 * @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
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 */
enum fc_lport_state {
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	LPORT_ST_DISABLED = 0,
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	LPORT_ST_FLOGI,
	LPORT_ST_DNS,
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	LPORT_ST_RNN_ID,
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	LPORT_ST_RSNN_NN,
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	LPORT_ST_RSPN_ID,
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	LPORT_ST_RFT_ID,
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	LPORT_ST_RFF_ID,
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	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
};

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/**
 * enum fc_rport_state - Remote port states
 * @RPORT_ST_INIT:    Initialized
 * @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_LOGO:    Remote port logout (LOGO) sent
 * @RPORT_ST_ADISC:   Discover Address sent
 * @RPORT_ST_DELETE:  Remote port being deleted
 * @RPORT_ST_RESTART: Remote port being deleted and will restart
*/
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enum fc_rport_state {
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	RPORT_ST_INIT,
	RPORT_ST_PLOGI,
	RPORT_ST_PRLI,
	RPORT_ST_RTV,
	RPORT_ST_READY,
	RPORT_ST_LOGO,
	RPORT_ST_ADISC,
	RPORT_ST_DELETE,
	RPORT_ST_RESTART,
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};

/**
 * struct fc_disc_port - temporary discovery port to hold rport identifiers
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 * @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
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 */
struct fc_disc_port {
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	struct fc_lport    *lp;
	struct list_head   peers;
	struct work_struct rport_work;
	u32                port_id;
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};

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/**
 * 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
 */
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enum fc_rport_event {
	RPORT_EV_NONE = 0,
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	RPORT_EV_READY,
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	RPORT_EV_FAILED,
	RPORT_EV_STOP,
	RPORT_EV_LOGO
};

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struct fc_rport_priv;

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/**
 * struct fc_rport_operations - Operations for a remote port
 * @event_callback: Function to be called for remote port events
 */
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struct fc_rport_operations {
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	void (*event_callback)(struct fc_lport *, struct fc_rport_priv *,
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			       enum fc_rport_event);
};

/**
 * struct fc_rport_libfc_priv - libfc internal information about a remote port
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 * @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)
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 */
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)
	unsigned int	           e_d_tov;
	unsigned int	           r_a_tov;
};

/**
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 * 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:          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
 * @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
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 */
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struct fc_rport_priv {
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	struct fc_lport		    *local_port;
	struct fc_rport		    *rport;
	struct kref		    kref;
	enum fc_rport_state         rp_state;
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	struct fc_rport_identifiers ids;
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	u16			    flags;
	u16		            max_seq;
	u16			    disc_id;
	u16			    maxframe_size;
	unsigned int	            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;
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};

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/**
 * 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
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 * @VLinkFailureCount:     Number of virtual link failures
 * @MissDiscAdvCount:      Number of missing FIP discovery advertisement
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 */
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;
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	u64		VLinkFailureCount;
	u64		MissDiscAdvCount;
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};

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/**
 * struct fc_seq_els_data - ELS data used for passing ELS specific responses
 * @fp:     The ELS frame
 * @reason: The reason for rejection
 * @explan: The explaination of the rejection
 *
 * Mainly used by the exchange manager layer.
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 */
struct fc_seq_els_data {
	struct fc_frame *fp;
	enum fc_els_rjt_reason reason;
	enum fc_els_rjt_explan explan;
};

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/**
 * 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
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 */
struct fc_fcp_pkt {
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	/* 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;
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	struct completion tm_done;
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	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;
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};

/*
 * 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;
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struct fc_exch_mgr_anchor;
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extern u16 fc_cpu_mask;	/* cpu mask for possible cpus */
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/**
 * 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
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 */
struct fc_seq {
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	u8  id;
	u16 ssb_stat;
	u16 cnt;
	u32 rec_data;
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};

#define FC_EX_DONE		(1 << 0) /* ep is completed */
#define FC_EX_RST_CLEANUP	(1 << 1) /* reset is forcing completion */

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/**
 * 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
 * @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
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 *
 * Locking notes: The ex_lock protects following items:
 *	state, esb_stat, f_ctl, seq.ssb_stat
 *	seq_id
 *	sequence allocation
 */
struct fc_exch {
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	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;
	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 *);

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};
#define	fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)


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struct libfc_function_template {
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	/*
	 * Interface to send a FC frame
	 *
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	 * STATUS: REQUIRED
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	 */
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	int (*frame_send)(struct fc_lport *, struct fc_frame *);
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	/*
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	 * Interface to send ELS/CT frames
	 *
	 * STATUS: OPTIONAL
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	 */
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	struct fc_seq *(*elsct_send)(struct fc_lport *, u32 did,
				     struct fc_frame *, unsigned int op,
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				     void (*resp)(struct fc_seq *,
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					     struct fc_frame *, void *arg),
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				     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.
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	 *
	 * STATUS: OPTIONAL
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	 */
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	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);
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	/*
	 * Sets up the DDP context for a given exchange id on the given
	 * scatterlist if LLD supports DDP for large receive.
	 *
	 * STATUS: OPTIONAL
	 */
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	int (*ddp_setup)(struct fc_lport *, u16, struct scatterlist *,
			 unsigned int);
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	/*
	 * Completes the DDP transfer and returns the length of data DDPed
	 * for the given exchange id.
	 *
	 * STATUS: OPTIONAL
	 */
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	int (*ddp_done)(struct fc_lport *, u16);
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	/*
	 * Allow LLD to fill its own Link Error Status Block
	 *
	 * STATUS: OPTIONAL
	 */
	void (*get_lesb)(struct fc_lport *, struct fc_els_lesb *lesb);
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	/*
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	 * Send a frame using an existing sequence and exchange.
	 *
	 * STATUS: OPTIONAL
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	 */
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	int (*seq_send)(struct fc_lport *, struct fc_seq *,
			struct fc_frame *);
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	/*
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	 * Send an ELS response using infomation from a previous
	 * exchange and sequence.
	 *
	 * STATUS: OPTIONAL
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	 */
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	void (*seq_els_rsp_send)(struct fc_seq *, enum fc_els_cmd,
				 struct fc_seq_els_data *);
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	/*
	 * 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.
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	 *
	 * STATUS: OPTIONAL
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	 */
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	int (*seq_exch_abort)(const struct fc_seq *,
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			      unsigned int timer_msec);

	/*
	 * Indicate that an exchange/sequence tuple is complete and the memory
	 * allocated for the related objects may be freed.
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	 *
	 * STATUS: OPTIONAL
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	 */
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	void (*exch_done)(struct fc_seq *);
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	/*
	 * Start a new sequence on the same exchange/sequence tuple.
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	 *
	 * STATUS: OPTIONAL
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	 */
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	struct fc_seq *(*seq_start_next)(struct fc_seq *);
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	/*
	 * 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.
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	 *
	 * STATUS: OPTIONAL
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	 */
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	void (*exch_mgr_reset)(struct fc_lport *, u32 s_id, u32 d_id);
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	/*
	 * Flush the rport work queue. Generally used before shutdown.
	 *
	 * STATUS: OPTIONAL
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	 */
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	void (*rport_flush_queue)(void);
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	/*
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	 * Receive a frame for a local port.
	 *
	 * STATUS: OPTIONAL
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	 */
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	void (*lport_recv)(struct fc_lport *, struct fc_seq *,
			   struct fc_frame *);
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	/*
	 * Reset the local port.
	 *
	 * STATUS: OPTIONAL
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	 */
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	int (*lport_reset)(struct fc_lport *);
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	/*
	 * 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 *);

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	/*
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	 * Create a remote port with a given port ID
	 *
	 * STATUS: OPTIONAL
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	 */
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	struct fc_rport_priv *(*rport_create)(struct fc_lport *, u32);
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	/*
	 * 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
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	 *
	 * STATUS: OPTIONAL
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	 */
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	int (*rport_login)(struct fc_rport_priv *);
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	/*
	 * Logoff, and remove the rport from the transport if
	 * it had been added. This will send a LOGO to the target.
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	 *
	 * STATUS: OPTIONAL
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	 */
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	int (*rport_logoff)(struct fc_rport_priv *);
647 648 649

	/*
	 * Recieve a request from a remote port.
650 651
	 *
	 * STATUS: OPTIONAL
652 653
	 */
	void (*rport_recv_req)(struct fc_seq *, struct fc_frame *,
654
			       struct fc_lport *);
655

656 657 658 659
	/*
	 * lookup an rport by it's port ID.
	 *
	 * STATUS: OPTIONAL
660
	 */
661
	struct fc_rport_priv *(*rport_lookup)(const struct fc_lport *, u32);
662

663 664 665 666 667 668
	/*
	 * 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 *);

669 670 671 672 673 674
	/*
	 * 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.
	 *
675
	 * STATUS: OPTIONAL
676
	 */
677 678 679
	int (*fcp_cmd_send)(struct fc_lport *, struct fc_fcp_pkt *,
			    void (*resp)(struct fc_seq *, struct fc_frame *,
					 void *));
680 681

	/*
682 683 684
	 * Cleanup the FCP layer, used durring link down and reset
	 *
	 * STATUS: OPTIONAL
685
	 */
686
	void (*fcp_cleanup)(struct fc_lport *);
687 688 689

	/*
	 * Abort all I/O on a local port
690 691
	 *
	 * STATUS: OPTIONAL
692
	 */
693
	void (*fcp_abort_io)(struct fc_lport *);
694

695 696 697 698
	/*
	 * Receive a request for the discovery layer.
	 *
	 * STATUS: OPTIONAL
699
	 */
700 701
	void (*disc_recv_req)(struct fc_seq *, struct fc_frame *,
			      struct fc_lport *);
702 703 704

	/*
	 * Start discovery for a local port.
705 706
	 *
	 * STATUS: OPTIONAL
707 708 709 710 711 712 713 714
	 */
	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
715 716
	 *
	 * STATUS: OPTIONAL
717 718 719 720 721 722 723
	 */
	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
724 725
	 *
	 * STATUS: OPTIONAL
726 727 728 729
	 */
	void (*disc_stop_final) (struct fc_lport *);
};

730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745
/**
 * struct fc_disc - Discovery context
 * @retry_count:   Number of retries
 * @pending:       1 if discovery is pending, 0 if not
 * @requesting:    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
 * @lport:         The local port that discovery is for
 * @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
 */
746
struct fc_disc {
747 748 749 750 751 752 753 754 755 756 757 758
	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;
	struct fc_lport	      *lport;
	struct mutex	      disc_mutex;
	struct fc_gpn_ft_resp partial_buf;
	struct delayed_work   disc_work;
759 760 761 762 763

	void (*disc_callback)(struct fc_lport *,
			      enum fc_disc_event);
};

764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804
/**
 * 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
 * @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
 * @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
 */
805 806
struct fc_lport {
	/* Associations */
807 808 809 810 811 812 813 814 815 816
	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;
817 818 819

	/* Operational Information */
	struct libfc_function_template tt;
820 821 822 823 824 825 826 827 828 829 830 831 832 833 834
	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 */
	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;
835 836

	/* Capabilities */
837 838 839 840 841 842 843 844 845 846 847 848 849 850
	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			       mfs;
	u8			       max_retry_count;
	u8			       max_rport_retry_count;
	u16			       link_speed;
	u16			       link_supported_speeds;
	u16			       lro_xid;
	unsigned int		       lso_max;
	struct fc_ns_fts	       fcts;
851 852

	/* Miscellaneous */
853 854 855
	struct mutex                   lp_mutex;
	struct list_head               list;
	struct delayed_work	       retry_work;
856 857
};

858
/*
859 860
 * FC_LPORT HELPER FUNCTIONS
 *****************************/
861 862 863 864 865 866

/**
 * 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)
867
{
868
	return lport->state == LPORT_ST_READY;
869 870
}

871 872 873 874 875 876
/**
 * 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)
877
{
878
	lport->wwnn = wwnn;
879 880
}

881 882 883 884 885 886
/**
 * 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)
887
{
888
	lport->wwpn = wwnn;
889 890
}

891 892 893 894 895 896
/**
 * 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,
897 898
					enum fc_lport_state state)
{
899 900 901
	if (state != lport->state)
		lport->retry_count = 0;
	lport->state = state;
902 903
}

904 905 906 907 908
/**
 * 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)
909
{
910 911
	lport->dev_stats = alloc_percpu(struct fcoe_dev_stats);
	if (!lport->dev_stats)
912 913 914 915
		return -ENOMEM;
	return 0;
}

916 917 918 919 920
/**
 * 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)
921
{
922
	free_percpu(lport->dev_stats);
923 924
}

925 926 927 928 929
/**
 * 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)
930
{
931
	return (void *)(lport + 1);
932 933 934
}

/**
935 936 937 938
 * 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
939
 *
940
 * Returns: libfc lport
941
 */
942
static inline struct fc_lport *
943 944
libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
{
945 946 947 948 949 950 951 952 953
	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);
954
	INIT_LIST_HEAD(&lport->vports);
955
	return lport;
956
}
957

958
/*
959
 * FC_FCP HELPER FUNCTIONS
960
 *****************************/
961 962 963 964 965 966
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;
}
967 968

/*
969 970 971 972 973 974
 * 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 *);
975
void __fc_linkup(struct fc_lport *);
976
void fc_linkup(struct fc_lport *);
977
void __fc_linkdown(struct fc_lport *);
978
void fc_linkdown(struct fc_lport *);
979 980
void fc_vport_setlink(struct fc_lport *);
void fc_vports_linkchange(struct fc_lport *);
981 982
int fc_lport_config(struct fc_lport *);
int fc_lport_reset(struct fc_lport *);
983 984 985 986
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 *);
987

988
/*
989 990
 * REMOTE PORT LAYER
 *****************************/
991 992
int fc_rport_init(struct fc_lport *);
void fc_rport_terminate_io(struct fc_rport *);
993

994
/*
995 996
 * DISCOVERY LAYER
 *****************************/
997
int fc_disc_init(struct fc_lport *);
998

999
/*
1000
 * FCP LAYER
1001 1002
 *****************************/
int fc_fcp_init(struct fc_lport *);
1003
void fc_fcp_destroy(struct fc_lport *);
1004 1005

/*
1006 1007 1008
 * SCSI INTERACTION LAYER
 *****************************/
int fc_queuecommand(struct scsi_cmnd *,
1009
		    void (*done)(struct scsi_cmnd *));
1010 1011 1012 1013 1014 1015
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);
1016

1017
/*
1018 1019
 * ELS/CT interface
 *****************************/
1020 1021 1022
int fc_elsct_init(struct fc_lport *);
struct fc_seq *fc_elsct_send(struct fc_lport *, u32 did,
				    struct fc_frame *,
1023 1024
				    unsigned int op,
				    void (*resp)(struct fc_seq *,
1025
						 struct fc_frame *,
1026 1027 1028 1029
						 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 *);
1030 1031


1032
/*
1033 1034
 * EXCHANGE MANAGER LAYER
 *****************************/
1035 1036 1037
int fc_exch_init(struct fc_lport *);
struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *,
					   struct fc_exch_mgr *,
1038
					   bool (*match)(struct fc_frame *));
1039
void fc_exch_mgr_del(struct fc_exch_mgr_anchor *);
1040
int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst);
1041 1042
struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *, enum fc_class class,
				      u16 min_xid, u16 max_xid,
1043
				      bool (*match)(struct fc_frame *));
1044 1045
void fc_exch_mgr_free(struct fc_lport *);
void fc_exch_recv(struct fc_lport *, struct fc_frame *);
1046
void fc_exch_mgr_reset(struct fc_lport *, u32 s_id, u32 d_id);
1047 1048 1049 1050

/*
 * Functions for fc_functions_template
 */
1051 1052 1053 1054
void fc_get_host_speed(struct Scsi_Host *);
void fc_get_host_port_type(struct Scsi_Host *);
void fc_get_host_port_state(struct Scsi_Host *);
void fc_set_rport_loss_tmo(struct fc_rport *, u32 timeout);
1055 1056 1057
struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *);

#endif /* _LIBFC_H_ */