path: root/include/scsi/libfc.h

/*
 * 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 <scsi/scsi_transport.h>
#include <scsi/scsi_transport_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>

#define LIBFC_DEBUG

#ifdef LIBFC_DEBUG
/* Log messages */
#define FC_DBG(fmt, args...)						\
	do {								\
		printk(KERN_INFO "%s " fmt, __func__, ##args);		\
	} while (0)
#else
#define FC_DBG(fmt, args...)
#endif

/*
 * 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)

#define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))

#define hton24(p, v)	do {			\
		p[0] = (((v) >> 16) & 0xFF);	\
		p[1] = (((v) >> 8) & 0xFF);	\
		p[2] = ((v) & 0xFF);		\
	} while (0)

/*
 * FC HBA status
 */
#define FC_PAUSE		    (1 << 1)
#define FC_LINK_UP		    (1 << 0)

enum fc_lport_state {
	LPORT_ST_NONE = 0,
	LPORT_ST_FLOGI,
	LPORT_ST_DNS,
	LPORT_ST_RPN_ID,
	LPORT_ST_RFT_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 {
	RPORT_ST_NONE = 0,
	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,		/* port logout sent */
};

enum fc_rport_trans_state {
	FC_PORTSTATE_ROGUE,
	FC_PORTSTATE_REAL,
};

/**
 * 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
 * @ids: identifiers structure to pass to fc_remote_port_add()
 * @rport_work: work struct for starting the rport state machine
 */
struct fc_disc_port {
	struct fc_lport             *lp;
	struct list_head            peers;
	struct fc_rport_identifiers ids;
	struct work_struct	    rport_work;
};

enum fc_rport_event {
	RPORT_EV_NONE = 0,
	RPORT_EV_CREATED,
	RPORT_EV_FAILED,
	RPORT_EV_STOP,
	RPORT_EV_LOGO
};

struct fc_rport_operations {
	void (*event_callback)(struct fc_lport *, struct fc_rport *,
			       enum fc_rport_event);
};

/**
 * struct fc_rport_libfc_priv - libfc internal information about a remote port
 * @local_port: Fibre Channel host port instance
 * @rp_state: state tracks progress of PLOGI, PRLI, and RTV exchanges
 * @flags: REC and RETRY supported flags
 * @max_seq: maximum number of concurrent sequences
 * @retries: retry count in current state
 * @e_d_tov: error detect timeout value (in msec)
 * @r_a_tov: resource allocation timeout value (in msec)
 * @rp_mutex: mutex protects rport
 * @retry_work:
 * @event_callback: Callback for rport READY, FAILED or LOGO
 */
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)
	u16		           max_seq;
	unsigned int	           retries;
	unsigned int	           e_d_tov;
	unsigned int	           r_a_tov;
	enum fc_rport_trans_state  trans_state;
	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;
};

#define PRIV_TO_RPORT(x)						\
	(struct fc_rport *)((void *)x - sizeof(struct fc_rport));
#define RPORT_TO_PRIV(x)						\
	(struct fc_rport_libfc_priv *)((void *)x + sizeof(struct fc_rport));

struct fc_rport *fc_rport_rogue_create(struct fc_disc_port *);

static inline void fc_rport_set_name(struct fc_rport *rport, u64 wwpn, u64 wwnn)
{
	rport->node_name = wwnn;
	rport->port_name = wwpn;
}

/*
 * fcoe stats structure
 */
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;
};

/*
 * els data is used for passing ELS respone specific
 * data to send ELS response mainly using infomation
 * in exchange and sequence in EM layer.
 */
struct fc_seq_els_data {
	struct fc_frame *fp;
	enum fc_els_rjt_reason reason;
	enum fc_els_rjt_explan explan;
};

/*
 * FCP request structure, one for each scsi cmd request
 */
struct fc_fcp_pkt {
	/*
	 * housekeeping stuff
	 */
	struct fc_lport *lp;	/* handle to hba struct */
	u16		state;		/* scsi_pkt state state */
	u16		tgt_flags;	/* target flags	 */
	atomic_t	ref_cnt;	/* fcp pkt ref count */
	spinlock_t	scsi_pkt_lock;	/* Must be taken before the host lock
					 * if both are held at the same time */
	/*
	 * SCSI I/O related stuff
	 */
	struct scsi_cmnd *cmd;		/* scsi command pointer. set/clear
					 * under host lock */
	struct list_head list;		/* tracks queued commands. access under
					 * host lock */
	/*
	 * timeout related stuff
	 */
	struct timer_list timer;	/* command timer */
	struct completion tm_done;
	int	wait_for_comp;
	unsigned long	start_time;	/* start jiffie */
	unsigned long	end_time;	/* end jiffie */
	unsigned long	last_pkt_time;	 /* jiffies of last frame received */

	/*
	 * scsi cmd and data transfer information
	 */
	u32		data_len;
	/*
	 * transport related veriables
	 */
	struct fcp_cmnd cdb_cmd;
	size_t		xfer_len;
	u32		xfer_contig_end; /* offset of end of contiguous xfer */
	u16		max_payload;	/* max payload size in bytes */

	/*
	 * scsi/fcp return status
	 */
	u32		io_status;	/* SCSI result upper 24 bits */
	u8		cdb_status;
	u8		status_code;	/* FCP I/O status */
	/* bit 3 Underrun bit 2: overrun */
	u8		scsi_comp_flags;
	u32		req_flags;	/* bit 0: read bit:1 write *