[PATCH] choose_new_parent: remove unused arg, sanitize exit_state check

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / scsi / scsi_transport_fc.h

/* 
 *  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) 2004-2005   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/config.h>
#include <linux/sched.h>
#include <scsi/scsi.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_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 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_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 Remote 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_RPORT_ROLE_UNKNOWN                   0x00
#define FC_RPORT_ROLE_FCP_TARGET                0x01
#define FC_RPORT_ROLE_FCP_INITIATOR             0x02
#define FC_RPORT_ROLE_IP_PORT                   0x04


/*
 * 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;

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

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

#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)
#define fc_starget_port_name(x) \
        (((struct fc_starget_attrs *)&(x)->starget_data)->port_name)
#define fc_starget_port_id(x) \
        (((struct fc_starget_attrs *)&(x)->starget_data)->port_id)

#define starget_to_rport(s)                     \
        scsi_is_fc_rport(s->dev.parent) ? dev_to_rport(s->dev.parent) : NULL


/*
 * FC Local Port (Host) Statistics
 */

/* FC Statistics - Following FC HBAAPI v2.0 guidelines */
struct fc_host_statistics {
        /* port statistics */
        u64 seconds_since_last_reset;
        u64 tx_frames;
        u64 tx_words;
        u64 rx_frames;
        u64 rx_words;
        u64 lip_count;
        u64 nos_count;
        u64 error_frames;
        u64 dumped_frames;
        u64 link_failure_count;
        u64 loss_of_sync_count;
        u64 loss_of_signal_count;
        u64 prim_seq_protocol_err_count;
        u64 invalid_tx_word_count;
        u64 invalid_crc_count;
        
        /* fc4 statistics  (only FCP supported currently) */
        u64 fcp_input_requests;
        u64 fcp_output_requests;
        u64 fcp_control_requests;
        u64 fcp_input_megabytes;
        u64 fcp_output_megabytes;
};


/*
 * FC Local Port (Host) Attributes
 *
 * Attributes are based on HBAAPI V2.0 definitions.
 * Note: OSDeviceName is determined by user-space library
 *
 * Fixed attributes are not expected to change. The driver is
 * expected to set these values after successfully calling scsi_add_host().
 * 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_FC4_LIST_SIZE                32
#define FC_SYMBOLIC_NAME_SIZE           256
#define FC_VERSION_STRING_SIZE          64
#define FC_SERIAL_NUMBER_SIZE           80

struct fc_host_attrs {
        /* Fixed Attributes */
        u64 node_name;
        u64 port_name;
        u64 permanent_port_name;
        u32 supported_classes;
        u8  supported_fc4s[FC_FC4_LIST_SIZE];
        char symbolic_name[FC_SYMBOLIC_NAME_SIZE];
        u32 supported_speeds;
        u32 maxframe_size;
        char serial_number[FC_SERIAL_NUMBER_SIZE];

        /* Dynamic Attributes */
        u32 port_id;
        enum fc_port_type port_type;
        enum fc_port_state port_state;
        u8  active_fc4s[FC_FC4_LIST_SIZE];
        u32 speed;
        u64 fabric_name;

        /* Private (Transport-managed) Attributes */
        enum fc_tgtid_binding_type  tgtid_bind_type;

        /* internal data */
        struct list_head rports;
        struct list_head rport_bindings;
        u32 next_rport_number;
        u32 next_target_id;
        u8 flags;
        struct work_struct rport_del_work;
};

/* values for struct fc_host_attrs "flags" field: */
#define FC_SHOST_RPORT_DEL_SCHEDULED    0x01


#define fc_host_node_name(x) \
        (((struct fc_host_attrs *)(x)->shost_data)->node_name)
#define fc_host_port_name(x)    \
        (((struct fc_host_attrs *)(x)->shost_data)->port_name)
#define fc_host_permanent_port_name(x)  \
        (((struct fc_host_attrs *)(x)->shost_data)->permanent_port_name)
#define fc_host_supported_classes(x)    \
        (((struct fc_host_attrs *)(x)->shost_data)->supported_classes)
#define fc_host_supported_fc4s(x)       \
        (((struct fc_host_attrs *)(x)->shost_data)->supported_fc4s)
#define fc_host_symbolic_name(x)        \
        (((struct fc_host_attrs *)(x)->shost_data)->symbolic_name)
#define fc_host_supported_speeds(x)     \
        (((struct fc_host_attrs *)(x)->shost_data)->supported_speeds)
#define fc_host_maxframe_size(x)        \
        (((struct fc_host_attrs *)(x)->shost_data)->maxframe_size)
#define fc_host_serial_number(x)        \
        (((struct fc_host_attrs *)(x)->shost_data)->serial_number)
#define fc_host_port_id(x)      \
        (((struct fc_host_attrs *)(x)->shost_data)->port_id)
#define fc_host_port_type(x)    \
        (((struct fc_host_attrs *)(x)->shost_data)->port_type)
#define fc_host_port_state(x)   \
        (((struct fc_host_attrs *)(x)->shost_data)->port_state)
#define fc_host_active_fc4s(x)  \
        (((struct fc_host_attrs *)(x)->shost_data)->active_fc4s)
#define fc_host_speed(x)        \
        (((struct fc_host_attrs *)(x)->shost_data)->speed)
#define fc_host_fabric_name(x)  \
        (((struct fc_host_attrs *)(x)->shost_data)->fabric_name)
#define fc_host_tgtid_bind_type(x) \
        (((struct fc_host_attrs *)(x)->shost_data)->tgtid_bind_type)
#define fc_host_rports(x) \
        (((struct fc_host_attrs *)(x)->shost_data)->rports)
#define fc_host_rport_bindings(x) \
        (((struct fc_host_attrs *)(x)->shost_data)->rport_bindings)
#define fc_host_next_rport_number(x) \
        (((struct fc_host_attrs *)(x)->shost_data)->next_rport_number)
#define fc_host_next_target_id(x) \
        (((struct fc_host_attrs *)(x)->shost_data)->next_target_id)
#define fc_host_flags(x) \
        (((struct fc_host_attrs *)(x)->shost_data)->flags)
#define fc_host_rport_del_work(x) \
        (((struct fc_host_attrs *)(x)->shost_data)->rport_del_work)


/* The functions by which the transport class and the driver communicate */
struct fc_function_template {
        void    (*get_rport_dev_loss_tmo)(struct fc_rport *);
        void    (*set_rport_dev_loss_tmo)(struct fc_rport *, u32);

        void    (*get_starget_node_name)(struct scsi_target *);
        void    (*get_starget_port_name)(struct scsi_target *);
        void    (*get_starget_port_id)(struct scsi_target *);

        void    (*get_host_port_id)(struct Scsi_Host *);
        void    (*get_host_port_type)(struct Scsi_Host *);
        void    (*get_host_port_state)(struct Scsi_Host *);
        void    (*get_host_active_fc4s)(struct Scsi_Host *);
        void    (*get_host_speed)(struct Scsi_Host *);
        void    (*get_host_fabric_name)(struct Scsi_Host *);

        struct fc_host_statistics * (*get_fc_host_stats)(struct Scsi_Host *);
        void    (*reset_fc_host_stats)(struct Scsi_Host *);

        int     (*issue_fc_host_lip)(struct Scsi_Host *);

        /* allocation lengths for host-specific data */
        u32                             dd_fcrport_size;

        /* 
         * The driver sets these to tell the transport class it
         * wants the attributes displayed in sysfs.  If the show_ flag
         * is not set, the attribute will be private to the transport
         * class 
         */

        /* remote port fixed attributes */
        unsigned long   show_rport_maxframe_size:1;
        unsigned long   show_rport_supported_classes:1;
        unsigned long   show_rport_dev_loss_tmo:1;

        /*
         * target dynamic attributes
         * These should all be "1" if the driver uses the remote port
         * add/delete functions (so attributes reflect rport values).
         */
        unsigned long   show_starget_node_name:1;
        unsigned long   show_starget_port_name:1;
        unsigned long   show_starget_port_id:1;

        /* host fixed attributes */
        unsigned long   show_host_node_name:1;
        unsigned long   show_host_port_name:1;
        unsigned long   show_host_permanent_port_name:1;
        unsigned long   show_host_supported_classes:1;
        unsigned long   show_host_supported_fc4s:1;
        unsigned long   show_host_symbolic_name:1;
        unsigned long   show_host_supported_speeds:1;
        unsigned long   show_host_maxframe_size:1;
        unsigned long   show_host_serial_number:1;
        /* host dynamic attributes */
        unsigned long   show_host_port_id:1;
        unsigned long   show_host_port_type:1;
        unsigned long   show_host_port_state:1;
        unsigned long   show_host_active_fc4s:1;
        unsigned long   show_host_speed:1;
        unsigned long   show_host_fabric_name:1;
};


/**
 * fc_remote_port_chkready - called to validate the remote port state
 *   prior to initiating io to the port.
 *
 * Returns a scsi result code that can be returned by the LLDD.
 *
 * @rport:      remote port to be checked
 **/
static inline int
fc_remote_port_chkready(struct fc_rport *rport)
{
        int result;

        switch (rport->port_state) {
        case FC_PORTSTATE_ONLINE:
                result = 0;
                break;
        case FC_PORTSTATE_BLOCKED:
                result = DID_BUS_BUSY << 16;
                break;
        default:
                result = DID_NO_CONNECT << 16;
                break;
        }
        return result;
}


struct scsi_transport_template *fc_attach_transport(
                        struct fc_function_template *);
void fc_release_transport(struct scsi_transport_template *);
void fc_remove_host(struct Scsi_Host *);
struct fc_rport *fc_remote_port_add(struct Scsi_Host *shost,
                        int channel, struct fc_rport_identifiers  *ids);
void fc_remote_port_delete(struct fc_rport  *rport);
void fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles);
int scsi_is_fc_rport(const struct device *);

static inline u64 wwn_to_u64(u8 *wwn)
{
        return (u64)wwn[0] << 56 | (u64)wwn[1] << 48 |
            (u64)wwn[2] << 40 | (u64)wwn[3] << 32 |
            (u64)wwn[4] << 24 | (u64)wwn[5] << 16 |
            (u64)wwn[6] <<  8 | (u64)wwn[7];
}

#endif /* SCSI_TRANSPORT_FC_H */