scsi_transport_fc.h

来自「linux 内核源代码」· C头文件 代码 · 共 738 行 · 第 1/2 页

/*
 *  FiberChannel transport specific attributes exported to sysfs.
 *
 *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  ========
 *
 *  Copyright (C) 2004-2007   James Smart, Emulex Corporation
 *    Rewrite for host, target, device, and remote port attributes,
 *    statistics, and service functions...
 *
 */
#ifndef SCSI_TRANSPORT_FC_H
#define SCSI_TRANSPORT_FC_H

#include <linux/sched.h>
#include <scsi/scsi.h>
#include <scsi/scsi_netlink.h>

struct scsi_transport_template;


/*
 * FC Port definitions - Following FC HBAAPI guidelines
 *
 * Note: Not all binary values for the different fields match HBAAPI.
 *  Instead, we use densely packed ordinal values or enums.
 *  We get away with this as we never present the actual binary values
 *  externally. For sysfs, we always present the string that describes
 *  the value. Thus, an admin doesn't need a magic HBAAPI decoder ring
 *  to understand the values. The HBAAPI user-space library is free to
 *  convert the strings into the HBAAPI-specified binary values.
 *
 * Note: Not all HBAAPI-defined values are contained in the definitions
 *  below. Those not appropriate to an fc_host (e.g. FCP initiator) have
 *  been removed.
 */

/*
 * fc_port_type: If you alter this, you also need to alter scsi_transport_fc.c
 * (for the ascii descriptions).
 */
enum fc_port_type {
	FC_PORTTYPE_UNKNOWN,
	FC_PORTTYPE_OTHER,
	FC_PORTTYPE_NOTPRESENT,
	FC_PORTTYPE_NPORT,		/* Attached to FPort */
	FC_PORTTYPE_NLPORT,		/* (Public) Loop w/ FLPort */
	FC_PORTTYPE_LPORT,		/* (Private) Loop w/o FLPort */
	FC_PORTTYPE_PTP,		/* Point to Point w/ another NPort */
	FC_PORTTYPE_NPIV,		/* VPORT based on NPIV */
};


/*
 * fc_port_state: If you alter this, you also need to alter scsi_transport_fc.c
 * (for the ascii descriptions).
 */
enum fc_port_state {
	FC_PORTSTATE_UNKNOWN,
	FC_PORTSTATE_NOTPRESENT,
	FC_PORTSTATE_ONLINE,
	FC_PORTSTATE_OFFLINE,		/* User has taken Port Offline */
	FC_PORTSTATE_BLOCKED,
	FC_PORTSTATE_BYPASSED,
	FC_PORTSTATE_DIAGNOSTICS,
	FC_PORTSTATE_LINKDOWN,
	FC_PORTSTATE_ERROR,
	FC_PORTSTATE_LOOPBACK,
	FC_PORTSTATE_DELETED,
};


/*
 * fc_vport_state: If you alter this, you also need to alter
 * scsi_transport_fc.c (for the ascii descriptions).
 */
enum fc_vport_state {
	FC_VPORT_UNKNOWN,
	FC_VPORT_ACTIVE,
	FC_VPORT_DISABLED,
	FC_VPORT_LINKDOWN,
	FC_VPORT_INITIALIZING,
	FC_VPORT_NO_FABRIC_SUPP,
	FC_VPORT_NO_FABRIC_RSCS,
	FC_VPORT_FABRIC_LOGOUT,
	FC_VPORT_FABRIC_REJ_WWN,
	FC_VPORT_FAILED,
};



/*
 * FC Classes of Service
 * Note: values are not enumerated, as they can be "or'd" together
 * for reporting (e.g. report supported_classes). If you alter this list,
 * you also need to alter scsi_transport_fc.c (for the ascii descriptions).
 */
#define FC_COS_UNSPECIFIED		0
#define FC_COS_CLASS1			2
#define FC_COS_CLASS2			4
#define FC_COS_CLASS3			8
#define FC_COS_CLASS4			0x10
#define FC_COS_CLASS6			0x40

/*
 * FC Port Speeds
 * Note: values are not enumerated, as they can be "or'd" together
 * for reporting (e.g. report supported_speeds). If you alter this list,
 * you also need to alter scsi_transport_fc.c (for the ascii descriptions).
 */
#define FC_PORTSPEED_UNKNOWN		0 /* Unknown - transceiver
					     incapable of reporting */
#define FC_PORTSPEED_1GBIT		1
#define FC_PORTSPEED_2GBIT		2
#define FC_PORTSPEED_4GBIT		4
#define FC_PORTSPEED_10GBIT		8
#define FC_PORTSPEED_8GBIT		0x10
#define FC_PORTSPEED_16GBIT		0x20
#define FC_PORTSPEED_NOT_NEGOTIATED	(1 << 15) /* Speed not established */

/*
 * fc_tgtid_binding_type: If you alter this, you also need to alter
 * scsi_transport_fc.c (for the ascii descriptions).
 */
enum fc_tgtid_binding_type  {
	FC_TGTID_BIND_NONE,
	FC_TGTID_BIND_BY_WWPN,
	FC_TGTID_BIND_BY_WWNN,
	FC_TGTID_BIND_BY_ID,
};

/*
 * FC Port Roles
 * Note: values are not enumerated, as they can be "or'd" together
 * for reporting (e.g. report roles). If you alter this list,
 * you also need to alter scsi_transport_fc.c (for the ascii descriptions).
 */
#define FC_PORT_ROLE_UNKNOWN			0x00
#define FC_PORT_ROLE_FCP_TARGET			0x01
#define FC_PORT_ROLE_FCP_INITIATOR		0x02
#define FC_PORT_ROLE_IP_PORT			0x04

/* The following are for compatibility */
#define FC_RPORT_ROLE_UNKNOWN			FC_PORT_ROLE_UNKNOWN
#define FC_RPORT_ROLE_FCP_TARGET		FC_PORT_ROLE_FCP_TARGET
#define FC_RPORT_ROLE_FCP_INITIATOR		FC_PORT_ROLE_FCP_INITIATOR
#define FC_RPORT_ROLE_IP_PORT			FC_PORT_ROLE_IP_PORT


/* Macro for use in defining Virtual Port attributes */
#define FC_VPORT_ATTR(_name,_mode,_show,_store)				\
struct class_device_attribute class_device_attr_vport_##_name = 	\
	__ATTR(_name,_mode,_show,_store)


/*
 * FC Virtual Port Attributes
 *
 * This structure exists for each FC port is a virtual FC port. Virtual
 * ports share the physical link with the Physical port. Each virtual
 * ports has a unique presense on the SAN, and may be instantiated via
 * NPIV, Virtual Fabrics, or via additional ALPAs. As the vport is a
 * unique presense, each vport has it's own view of the fabric,
 * authentication priviledge, and priorities.
 *
 * A virtual port may support 1 or more FC4 roles. Typically it is a
 * FCP Initiator. It could be a FCP Target, or exist sole for an IP over FC
 * roles. FC port attributes for the vport will be reported on any
 * fc_host class object allocated for an FCP Initiator.
 *
 * --
 *
 * Fixed attributes are not expected to change. The driver is
 * expected to set these values after receiving the fc_vport structure
 * via the vport_create() call from the transport.
 * The transport fully manages all get functions w/o driver interaction.
 *
 * Dynamic attributes are expected to change. The driver participates
 * in all get/set operations via functions provided by the driver.
 *
 * Private attributes are transport-managed values. They are fully
 * managed by the transport w/o driver interaction.
 */

#define FC_VPORT_SYMBOLIC_NAMELEN		64
struct fc_vport {
	/* Fixed Attributes */

	/* Dynamic Attributes */

	/* Private (Transport-managed) Attributes */
	enum fc_vport_state vport_state;
	enum fc_vport_state vport_last_state;
	u64 node_name;
	u64 port_name;
	u32 roles;
	u32 vport_id;		/* Admin Identifier for the vport */
	enum fc_port_type vport_type;
	char symbolic_name[FC_VPORT_SYMBOLIC_NAMELEN];

	/* exported data */
	void *dd_data;			/* Used for driver-specific storage */

	/* internal data */
	struct Scsi_Host *shost;	/* Physical Port Parent */
	unsigned int channel;
	u32 number;
	u8 flags;
	struct list_head peers;
	struct device dev;
	struct work_struct vport_delete_work;
} __attribute__((aligned(sizeof(unsigned long))));

/* bit field values for struct fc_vport "flags" field: */
#define FC_VPORT_CREATING		0x01
#define FC_VPORT_DELETING		0x02
#define FC_VPORT_DELETED		0x04
#define FC_VPORT_DEL			0x06	/* Any DELETE state */

#define	dev_to_vport(d)				\
	container_of(d, struct fc_vport, dev)
#define transport_class_to_vport(classdev)	\
	dev_to_vport(classdev->dev)
#define vport_to_shost(v)			\
	(v->shost)
#define vport_to_shost_channel(v)		\
	(v->channel)
#define vport_to_parent(v)			\
	(v->dev.parent)


/* Error return codes for vport_create() callback */
#define VPCERR_UNSUPPORTED		-ENOSYS		/* no driver/adapter
							   support */
#define VPCERR_BAD_WWN			-ENOTUNIQ	/* driver validation
							   of WWNs failed */
#define VPCERR_NO_FABRIC_SUPP		-EOPNOTSUPP	/* Fabric connection
							   is loop or the
							   Fabric Port does
							   not support NPIV */

/*
 * fc_rport_identifiers: This set of data contains all elements
 * to uniquely identify a remote FC port. The driver uses this data
 * to report the existence of a remote FC port in the topology. Internally,
 * the transport uses this data for attributes and to manage consistent
 * target id bindings.
 */
struct fc_rport_identifiers {
	u64 node_name;
	u64 port_name;
	u32 port_id;
	u32 roles;
};


/* Macro for use in defining Remote Port attributes */
#define FC_RPORT_ATTR(_name,_mode,_show,_store)				\
struct class_device_attribute class_device_attr_rport_##_name = 	\
	__ATTR(_name,_mode,_show,_store)


/*
 * FC Remote Port Attributes
 *
 * This structure exists for each remote FC port that a LLDD notifies
 * the subsystem of.  A remote FC port may or may not be a SCSI Target,
 * also be a SCSI initiator, IP endpoint, etc. As such, the remote
 * port is considered a separate entity, independent of "role" (such
 * as scsi target).
 *
 * --
 *
 * Attributes are based on HBAAPI V2.0 definitions. Only those
 * attributes that are determinable by the local port (aka Host)
 * are contained.
 *
 * Fixed attributes are not expected to change. The driver is
 * expected to set these values after successfully calling
 * fc_remote_port_add(). The transport fully manages all get functions
 * w/o driver interaction.
 *
 * Dynamic attributes are expected to change. The driver participates
 * in all get/set operations via functions provided by the driver.
 *
 * Private attributes are transport-managed values. They are fully
 * managed by the transport w/o driver interaction.
 */

struct fc_rport {	/* aka fc_starget_attrs */
	/* Fixed Attributes */
	u32 maxframe_size;
	u32 supported_classes;

	/* Dynamic Attributes */
	u32 dev_loss_tmo;	/* Remote Port loss timeout in seconds. */

	/* Private (Transport-managed) Attributes */
	u64 node_name;
	u64 port_name;
	u32 port_id;
	u32 roles;
	enum fc_port_state port_state;	/* Will only be ONLINE or UNKNOWN */
	u32 scsi_target_id;
	u32 fast_io_fail_tmo;

	/* exported data */
	void *dd_data;			/* Used for driver-specific storage */

	/* internal data */
	unsigned int channel;
	u32 number;
	u8 flags;
	struct list_head peers;
	struct device dev;
 	struct delayed_work dev_loss_work;
 	struct work_struct scan_work;
 	struct delayed_work fail_io_work;
 	struct work_struct stgt_delete_work;
	struct work_struct rport_delete_work;
} __attribute__((aligned(sizeof(unsigned long))));

/* bit field values for struct fc_rport "flags" field: */
#define FC_RPORT_DEVLOSS_PENDING	0x01
#define FC_RPORT_SCAN_PENDING		0x02

#define	dev_to_rport(d)				\
	container_of(d, struct fc_rport, dev)
#define transport_class_to_rport(classdev)	\
	dev_to_rport(classdev->dev)
#define rport_to_shost(r)			\
	dev_to_shost(r->dev.parent)

/*
 * FC SCSI Target Attributes
 *
 * The SCSI Target is considered an extention of a remote port (as
 * a remote port can be more than a SCSI Target). Within the scsi
 * subsystem, we leave the Target as a separate entity. Doing so
 * provides backward compatibility with prior FC transport api's,
 * and lets remote ports be handled entirely within the FC transport
 * and independently from the scsi subsystem. The drawback is that
 * some data will be duplicated.
 */

struct fc_starget_attrs {	/* aka fc_target_attrs */
	/* Dynamic Attributes */
	u64 node_name;
	u64 port_name;
	u32 port_id;
};

#define fc_starget_node_name(x) \
	(((struct fc_starget_attrs *)&(x)->starget_data)->node_name)