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[pohmelfs.git] / drivers / scsi / fnic / fcpio.h

/*
 * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#ifndef _FCPIO_H_
#define _FCPIO_H_

#include <linux/if_ether.h>

/*
 * This header file includes all of the data structures used for
 * communication by the host driver to the fcp firmware.
 */

/*
 * Exchange and sequence id space allocated to the host driver
 */
#define FCPIO_HOST_EXCH_RANGE_START         0x1000
#define FCPIO_HOST_EXCH_RANGE_END           0x1fff
#define FCPIO_HOST_SEQ_ID_RANGE_START       0x80
#define FCPIO_HOST_SEQ_ID_RANGE_END         0xff

/*
 * Command entry type
 */
enum fcpio_type {
        /*
         * Initiator request types
         */
        FCPIO_ICMND_16 = 0x1,
        FCPIO_ICMND_32,
        FCPIO_ICMND_CMPL,
        FCPIO_ITMF,
        FCPIO_ITMF_CMPL,

        /*
         * Target request types
         */
        FCPIO_TCMND_16 = 0x11,
        FCPIO_TCMND_32,
        FCPIO_TDATA,
        FCPIO_TXRDY,
        FCPIO_TRSP,
        FCPIO_TDRSP_CMPL,
        FCPIO_TTMF,
        FCPIO_TTMF_ACK,
        FCPIO_TABORT,
        FCPIO_TABORT_CMPL,

        /*
         * Misc request types
         */
        FCPIO_ACK = 0x20,
        FCPIO_RESET,
        FCPIO_RESET_CMPL,
        FCPIO_FLOGI_REG,
        FCPIO_FLOGI_REG_CMPL,
        FCPIO_ECHO,
        FCPIO_ECHO_CMPL,
        FCPIO_LUNMAP_CHNG,
        FCPIO_LUNMAP_REQ,
        FCPIO_LUNMAP_REQ_CMPL,
        FCPIO_FLOGI_FIP_REG,
        FCPIO_FLOGI_FIP_REG_CMPL,
};

/*
 * Header status codes from the firmware
 */
enum fcpio_status {
        FCPIO_SUCCESS = 0,              /* request was successful */

        /*
         * If a request to the firmware is rejected, the original request
         * header will be returned with the status set to one of the following:
         */
        FCPIO_INVALID_HEADER,    /* header contains invalid data */
        FCPIO_OUT_OF_RESOURCE,   /* out of resources to complete request */
        FCPIO_INVALID_PARAM,     /* some parameter in request is invalid */
        FCPIO_REQ_NOT_SUPPORTED, /* request type is not supported */
        FCPIO_IO_NOT_FOUND,      /* requested I/O was not found */

        /*
         * Once a request is processed, the firmware will usually return
         * a cmpl message type.  In cases where errors occurred,
         * the header status field would be filled in with one of the following:
         */
        FCPIO_ABORTED = 0x41,     /* request was aborted */
        FCPIO_TIMEOUT,            /* request was timed out */
        FCPIO_SGL_INVALID,        /* request was aborted due to sgl error */
        FCPIO_MSS_INVALID,        /* request was aborted due to mss error */
        FCPIO_DATA_CNT_MISMATCH,  /* recv/sent more/less data than exp. */
        FCPIO_FW_ERR,             /* request was terminated due to fw error */
        FCPIO_ITMF_REJECTED,      /* itmf req was rejected by remote node */
        FCPIO_ITMF_FAILED,        /* itmf req was failed by remote node */
        FCPIO_ITMF_INCORRECT_LUN, /* itmf req targeted incorrect LUN */
        FCPIO_CMND_REJECTED,      /* request was invalid and rejected */
        FCPIO_NO_PATH_AVAIL,      /* no paths to the lun was available */
        FCPIO_PATH_FAILED,        /* i/o sent to current path failed */
        FCPIO_LUNMAP_CHNG_PEND,   /* i/o rejected due to lunmap change */
};

/*
 * The header command tag.  All host requests will use the "tag" field
 * to mark commands with a unique tag.  When the firmware responds to
 * a host request, it will copy the tag field into the response.
 *
 * The only firmware requests that will use the rx_id/ox_id fields instead
 * of the tag field will be the target command and target task management
 * requests.  These two requests do not have corresponding host requests
 * since they come directly from the FC initiator on the network.
 */
struct fcpio_tag {
        union {
                u32 req_id;
                struct {
                        u16 rx_id;
                        u16 ox_id;
                } ex_id;
        } u;
};

static inline void
fcpio_tag_id_enc(struct fcpio_tag *tag, u32 id)
{
        tag->u.req_id = id;
}

static inline void
fcpio_tag_id_dec(struct fcpio_tag *tag, u32 *id)
{
        *id = tag->u.req_id;
}

static inline void
fcpio_tag_exid_enc(struct fcpio_tag *tag, u16 ox_id, u16 rx_id)
{
        tag->u.ex_id.rx_id = rx_id;
        tag->u.ex_id.ox_id = ox_id;
}

static inline void
fcpio_tag_exid_dec(struct fcpio_tag *tag, u16 *ox_id, u16 *rx_id)
{
        *rx_id = tag->u.ex_id.rx_id;
        *ox_id = tag->u.ex_id.ox_id;
}

/*
 * The header for an fcpio request, whether from the firmware or from the
 * host driver
 */
struct fcpio_header {
        u8            type;           /* enum fcpio_type */
        u8            status;         /* header status entry */
        u16           _resvd;         /* reserved */
        struct fcpio_tag    tag;      /* header tag */
};

static inline void
fcpio_header_enc(struct fcpio_header *hdr,
                 u8 type, u8 status,
                 struct fcpio_tag tag)
{
        hdr->type = type;
        hdr->status = status;
        hdr->_resvd = 0;
        hdr->tag = tag;
}

static inline void
fcpio_header_dec(struct fcpio_header *hdr,
                 u8 *type, u8 *status,
                 struct fcpio_tag *tag)
{
        *type = hdr->type;
        *status = hdr->status;
        *tag = hdr->tag;
}

#define CDB_16      16
#define CDB_32      32
#define LUN_ADDRESS 8

/*
 * fcpio_icmnd_16: host -> firmware request
 *
 * used for sending out an initiator SCSI 16-byte command
 */
struct fcpio_icmnd_16 {
        u32       lunmap_id;            /* index into lunmap table */
        u8        special_req_flags;    /* special exchange request flags */
        u8        _resvd0[3];           /* reserved */
        u32       sgl_cnt;              /* scatter-gather list count */
        u32       sense_len;            /* sense buffer length */
        u64       sgl_addr;             /* scatter-gather list addr */
        u64       sense_addr;           /* sense buffer address */
        u8        crn;                  /* SCSI Command Reference No. */
        u8        pri_ta;               /* SCSI Priority and Task attribute */
        u8        _resvd1;              /* reserved: should be 0 */
        u8        flags;                /* command flags */
        u8        scsi_cdb[CDB_16];     /* SCSI Cmnd Descriptor Block */
        u32       data_len;             /* length of data expected */
        u8        lun[LUN_ADDRESS];     /* FC vNIC only: LUN address */
        u8        _resvd2;              /* reserved */
        u8        d_id[3];              /* FC vNIC only: Target D_ID */
        u16       mss;                  /* FC vNIC only: max burst */
        u16       _resvd3;              /* reserved */
        u32       r_a_tov;              /* FC vNIC only: Res. Alloc Timeout */
        u32       e_d_tov;              /* FC vNIC only: Err Detect Timeout */
};

/*
 * Special request flags
 */
#define FCPIO_ICMND_SRFLAG_RETRY 0x01   /* Enable Retry handling on exchange */

/*
 * Priority/Task Attribute settings
 */
#define FCPIO_ICMND_PTA_SIMPLE      0   /* simple task attribute */
#define FCPIO_ICMND_PTA_HEADQ       1   /* head of queue task attribute */
#define FCPIO_ICMND_PTA_ORDERED     2   /* ordered task attribute */
#define FCPIO_ICMND_PTA_ACA         4   /* auto contingent allegiance */
#define FCPIO_ICMND_PRI_SHIFT       3   /* priority field starts in bit 3 */

/*
 * Command flags
 */
#define FCPIO_ICMND_RDDATA      0x02    /* read data */
#define FCPIO_ICMND_WRDATA      0x01    /* write data */

/*
 * fcpio_icmnd_32: host -> firmware request
 *
 * used for sending out an initiator SCSI 32-byte command
 */
struct fcpio_icmnd_32 {
        u32   lunmap_id;              /* index into lunmap table */
        u8    special_req_flags;      /* special exchange request flags */
        u8    _resvd0[3];             /* reserved */
        u32   sgl_cnt;                /* scatter-gather list count */
        u32   sense_len;              /* sense buffer length */
        u64   sgl_addr;               /* scatter-gather list addr */
        u64   sense_addr;             /* sense buffer address */
        u8    crn;                    /* SCSI Command Reference No. */
        u8    pri_ta;                 /* SCSI Priority and Task attribute */
        u8    _resvd1;                /* reserved: should be 0 */
        u8    flags;                  /* command flags */
        u8    scsi_cdb[CDB_32];       /* SCSI Cmnd Descriptor Block */
        u32   data_len;               /* length of data expected */
        u8    lun[LUN_ADDRESS];       /* FC vNIC only: LUN address */
        u8    _resvd2;                /* reserved */
        u8    d_id[3];                /* FC vNIC only: Target D_ID */
        u16   mss;                    /* FC vNIC only: max burst */
        u16   _resvd3;                /* reserved */
        u32   r_a_tov;                /* FC vNIC only: Res. Alloc Timeout */
        u32   e_d_tov;                /* FC vNIC only: Error Detect Timeout */
};

/*
 * fcpio_itmf: host -> firmware request
 *
 * used for requesting the firmware to abort a request and/or send out
 * a task management function
 *
 * The t_tag field is only needed when the request type is ABT_TASK.
 */
struct fcpio_itmf {
        u32   lunmap_id;              /* index into lunmap table */
        u32   tm_req;                 /* SCSI Task Management request */
        u32   t_tag;                  /* header tag of fcpio to be aborted */
        u32   _resvd;                 /* _reserved */
        u8    lun[LUN_ADDRESS];       /* FC vNIC only: LUN address */
        u8    _resvd1;                /* reserved */
        u8    d_id[3];                /* FC vNIC only: Target D_ID */
        u32   r_a_tov;                /* FC vNIC only: R_A_TOV in msec */
        u32   e_d_tov;                /* FC vNIC only: E_D_TOV in msec */
};

/*
 * Task Management request
 */
enum fcpio_itmf_tm_req_type {
        FCPIO_ITMF_ABT_TASK_TERM = 0x01,    /* abort task and terminate */
        FCPIO_ITMF_ABT_TASK,                /* abort task and issue abts */
        FCPIO_ITMF_ABT_TASK_SET,            /* abort task set */
        FCPIO_ITMF_CLR_TASK_SET,            /* clear task set */
        FCPIO_ITMF_LUN_RESET,               /* logical unit reset task mgmt */
        FCPIO_ITMF_CLR_ACA,                 /* Clear ACA condition */
};

/*
 * fcpio_tdata: host -> firmware request
 *
 * used for requesting the firmware to send out a read data transfer for a
 * target command
 */
struct fcpio_tdata {
        u16   rx_id;                  /* FC rx_id of target command */
        u16   flags;                  /* command flags */
        u32   rel_offset;             /* data sequence relative offset */
        u32   sgl_cnt;                /* scatter-gather list count */
        u32   data_len;               /* length of data expected to send */
        u64   sgl_addr;               /* scatter-gather list address */
};

/*
 * Command flags
 */
#define FCPIO_TDATA_SCSI_RSP    0x01    /* send a scsi resp. after last frame */

/*
 * fcpio_txrdy: host -> firmware request
 *
 * used for requesting the firmware to send out a write data transfer for a
 * target command
 */
struct fcpio_txrdy {
        u16   rx_id;                  /* FC rx_id of target command */
        u16   _resvd0;                /* reserved */
        u32   rel_offset;             /* data sequence relative offset */
        u32   sgl_cnt;                /* scatter-gather list count */
        u32   data_len;               /* length of data expected to send */
        u64   sgl_addr;               /* scatter-gather list address */
};

/*
 * fcpio_trsp: host -> firmware request
 *
 * used for requesting the firmware to send out a response for a target
 * command
 */
struct fcpio_trsp {
        u16   rx_id;                  /* FC rx_id of target command */
        u16   _resvd0;                /* reserved */
        u32   sense_len;              /* sense data buffer length */
        u64   sense_addr;             /* sense data buffer address */
        u16   _resvd1;                /* reserved */
        u8    flags;                  /* response request flags */
        u8    scsi_status;            /* SCSI status */
        u32   residual;               /* SCSI data residual value of I/O */
};

/*
 * resposnse request flags
 */
#define FCPIO_TRSP_RESID_UNDER  0x08   /* residual is valid and is underflow */
#define FCPIO_TRSP_RESID_OVER   0x04   /* residual is valid and is overflow */

/*
 * fcpio_ttmf_ack: host -> firmware response
 *
 * used by the host to indicate to the firmware it has received and processed
 * the target tmf request
 */
struct fcpio_ttmf_ack {
        u16   rx_id;                  /* FC rx_id of target command */
        u16   _resvd0;                /* reserved */
        u32   tmf_status;             /* SCSI task management status */
};

/*
 * fcpio_tabort: host -> firmware request
 *
 * used by the host to request the firmware to abort a target request that was
 * received by the firmware
 */
struct fcpio_tabort {
        u16   rx_id;                  /* rx_id of the target request */
};

/*
 * fcpio_reset: host -> firmware request
 *
 * used by the host to signal a reset of the driver to the firmware
 * and to request firmware to clean up all outstanding I/O
 */
struct fcpio_reset {
        u32   _resvd;
};

enum fcpio_flogi_reg_format_type {
        FCPIO_FLOGI_REG_DEF_DEST = 0,    /* Use the oui | s_id mac format */
        FCPIO_FLOGI_REG_GW_DEST,         /* Use the fixed gateway mac */
};

/*
 * fcpio_flogi_reg: host -> firmware request
 *
 * fc vnic only
 * used by the host to notify the firmware of the lif's s_id
 * and destination mac address format
 */
struct fcpio_flogi_reg {
        u8 format;
        u8 s_id[3];                     /* FC vNIC only: Source S_ID */
        u8 gateway_mac[ETH_ALEN];       /* Destination gateway mac */
        u16 _resvd;
        u32 r_a_tov;                    /* R_A_TOV in msec */
        u32 e_d_tov;                    /* E_D_TOV in msec */
};

/*
 * fcpio_echo: host -> firmware request
 *
 * sends a heartbeat echo request to the firmware
 */
struct fcpio_echo {
        u32 _resvd;
};

/*
 * fcpio_lunmap_req: host -> firmware request
 *
 * scsi vnic only
 * sends a request to retrieve the lunmap table for scsi vnics
 */
struct fcpio_lunmap_req {
        u64 addr;                     /* address of the buffer */
        u32 len;                      /* len of the buffer */
};

/*
 * fcpio_flogi_fip_reg: host -> firmware request
 *
 * fc vnic only
 * used by the host to notify the firmware of the lif's s_id
 * and destination mac address format
 */
struct fcpio_flogi_fip_reg {
        u8    _resvd0;
        u8     s_id[3];               /* FC vNIC only: Source S_ID */
        u8     fcf_mac[ETH_ALEN];     /* FCF Target destination mac */
        u16   _resvd1;
        u32   r_a_tov;                /* R_A_TOV in msec */
        u32   e_d_tov;                /* E_D_TOV in msec */
        u8    ha_mac[ETH_ALEN];       /* Host adapter source mac */
        u16   _resvd2;
};

/*
 * Basic structure for all fcpio structures that are sent from the host to the
 * firmware.  They are 128 bytes per structure.
 */
#define FCPIO_HOST_REQ_LEN      128     /* expected length of host requests */

struct fcpio_host_req {
        struct fcpio_header hdr;

        union {
                /*
                 * Defines space needed for request
                 */
                u8 buf[FCPIO_HOST_REQ_LEN - sizeof(struct fcpio_header)];

                /*
                 * Initiator host requests
                 */
                struct fcpio_icmnd_16               icmnd_16;
                struct fcpio_icmnd_32               icmnd_32;
                struct fcpio_itmf                   itmf;

                /*
                 * Target host requests
                 */
                struct fcpio_tdata                  tdata;
                struct fcpio_txrdy                  txrdy;
                struct fcpio_trsp                   trsp;
                struct fcpio_ttmf_ack               ttmf_ack;
                struct fcpio_tabort                 tabort;

                /*
                 * Misc requests
                 */
                struct fcpio_reset                  reset;
                struct fcpio_flogi_reg              flogi_reg;
                struct fcpio_echo                   echo;
                struct fcpio_lunmap_req             lunmap_req;
                struct fcpio_flogi_fip_reg          flogi_fip_reg;
        } u;
};

/*
 * fcpio_icmnd_cmpl: firmware -> host response
 *
 * used for sending the host a response to an initiator command
 */
struct fcpio_icmnd_cmpl {
        u8    _resvd0[6];             /* reserved */
        u8    flags;                  /* response flags */
        u8    scsi_status;            /* SCSI status */
        u32   residual;               /* SCSI data residual length */
        u32   sense_len;              /* SCSI sense length */
};

/*
 * response flags
 */
#define FCPIO_ICMND_CMPL_RESID_UNDER    0x08    /* resid under and valid */
#define FCPIO_ICMND_CMPL_RESID_OVER     0x04    /* resid over and valid */

/*
 * fcpio_itmf_cmpl: firmware -> host response
 *
 * used for sending the host a response for a itmf request
 */
struct fcpio_itmf_cmpl {
        u32    _resvd;                /* reserved */
};

/*
 * fcpio_tcmnd_16: firmware -> host request
 *
 * used by the firmware to notify the host of an incoming target SCSI 16-Byte
 * request
 */
struct fcpio_tcmnd_16 {
        u8    lun[LUN_ADDRESS];       /* FC vNIC only: LUN address */
        u8    crn;                    /* SCSI Command Reference No. */
        u8    pri_ta;                 /* SCSI Priority and Task attribute */
        u8    _resvd2;                /* reserved: should be 0 */
        u8    flags;                  /* command flags */
        u8    scsi_cdb[CDB_16];       /* SCSI Cmnd Descriptor Block */
        u32   data_len;               /* length of data expected */
        u8    _resvd1;                /* reserved */
        u8    s_id[3];                /* FC vNIC only: Source S_ID */
};

/*
 * Priority/Task Attribute settings
 */
#define FCPIO_TCMND_PTA_SIMPLE      0   /* simple task attribute */
#define FCPIO_TCMND_PTA_HEADQ       1   /* head of queue task attribute */
#define FCPIO_TCMND_PTA_ORDERED     2   /* ordered task attribute */
#define FCPIO_TCMND_PTA_ACA         4   /* auto contingent allegiance */
#define FCPIO_TCMND_PRI_SHIFT       3   /* priority field starts in bit 3 */

/*
 * Command flags
 */
#define FCPIO_TCMND_RDDATA      0x02    /* read data */
#define FCPIO_TCMND_WRDATA      0x01    /* write data */

/*
 * fcpio_tcmnd_32: firmware -> host request
 *
 * used by the firmware to notify the host of an incoming target SCSI 32-Byte
 * request
 */
struct fcpio_tcmnd_32 {
        u8    lun[LUN_ADDRESS];       /* FC vNIC only: LUN address */
        u8    crn;                    /* SCSI Command Reference No. */
        u8    pri_ta;                 /* SCSI Priority and Task attribute */
        u8    _resvd2;                /* reserved: should be 0 */
        u8    flags;                  /* command flags */
        u8    scsi_cdb[CDB_32];       /* SCSI Cmnd Descriptor Block */
        u32   data_len;               /* length of data expected */
        u8    _resvd0;                /* reserved */
        u8    s_id[3];                /* FC vNIC only: Source S_ID */
};

/*
 * fcpio_tdrsp_cmpl: firmware -> host response
 *
 * used by the firmware to notify the host of a response to a host target
 * command
 */
struct fcpio_tdrsp_cmpl {
        u16   rx_id;                  /* rx_id of the target request */
        u16   _resvd0;                /* reserved */
};

/*
 * fcpio_ttmf: firmware -> host request
 *
 * used by the firmware to notify the host of an incoming task management
 * function request
 */
struct fcpio_ttmf {
        u8    _resvd0;                /* reserved */
        u8    s_id[3];                /* FC vNIC only: Source S_ID */
        u8    lun[LUN_ADDRESS];       /* FC vNIC only: LUN address */
        u8    crn;                    /* SCSI Command Reference No. */
        u8    _resvd2[3];             /* reserved */
        u32   tmf_type;               /* task management request type */
};

/*
 * Task Management request
 */
#define FCPIO_TTMF_CLR_ACA      0x40    /* Clear ACA condition */
#define FCPIO_TTMF_LUN_RESET    0x10    /* logical unit reset task mgmt */
#define FCPIO_TTMF_CLR_TASK_SET 0x04    /* clear task set */
#define FCPIO_TTMF_ABT_TASK_SET 0x02    /* abort task set */
#define FCPIO_TTMF_ABT_TASK     0x01    /* abort task */

/*
 * fcpio_tabort_cmpl: firmware -> host response
 *
 * used by the firmware to respond to a host's tabort request
 */
struct fcpio_tabort_cmpl {
        u16   rx_id;                  /* rx_id of the target request */
        u16   _resvd0;                /* reserved */
};

/*
 * fcpio_ack: firmware -> host response
 *
 * used by firmware to notify the host of the last work request received
 */
struct fcpio_ack {
        u16  request_out;             /* last host entry received */
        u16  _resvd;
};

/*
 * fcpio_reset_cmpl: firmware -> host response
 *
 * use by firmware to respond to the host's reset request
 */
struct fcpio_reset_cmpl {
        u16   vnic_id;
};

/*
 * fcpio_flogi_reg_cmpl: firmware -> host response
 *
 * fc vnic only
 * response to the fcpio_flogi_reg request
 */
struct fcpio_flogi_reg_cmpl {
        u32 _resvd;
};

/*
 * fcpio_echo_cmpl: firmware -> host response
 *
 * response to the fcpio_echo request
 */
struct fcpio_echo_cmpl {
        u32 _resvd;
};

/*
 * fcpio_lunmap_chng: firmware -> host notification
 *
 * scsi vnic only
 * notifies the host that the lunmap tables have changed
 */
struct fcpio_lunmap_chng {
        u32 _resvd;
};

/*
 * fcpio_lunmap_req_cmpl: firmware -> host response
 *
 * scsi vnic only
 * response for lunmap table request from the host
 */
struct fcpio_lunmap_req_cmpl {
        u32 _resvd;
};

/*
 * Basic structure for all fcpio structures that are sent from the firmware to
 * the host.  They are 64 bytes per structure.
 */
#define FCPIO_FW_REQ_LEN        64      /* expected length of fw requests */
struct fcpio_fw_req {
        struct fcpio_header hdr;

        union {
                /*
                 * Defines space needed for request
                 */
                u8 buf[FCPIO_FW_REQ_LEN - sizeof(struct fcpio_header)];

                /*
                 * Initiator firmware responses
                 */
                struct fcpio_icmnd_cmpl         icmnd_cmpl;
                struct fcpio_itmf_cmpl          itmf_cmpl;

                /*
                 * Target firmware new requests
                 */
                struct fcpio_tcmnd_16           tcmnd_16;
                struct fcpio_tcmnd_32           tcmnd_32;

                /*
                 * Target firmware responses
                 */
                struct fcpio_tdrsp_cmpl         tdrsp_cmpl;
                struct fcpio_ttmf               ttmf;
                struct fcpio_tabort_cmpl        tabort_cmpl;

                /*
                 * Firmware response to work received
                 */
                struct fcpio_ack                ack;

                /*
                 * Misc requests
                 */
                struct fcpio_reset_cmpl         reset_cmpl;
                struct fcpio_flogi_reg_cmpl     flogi_reg_cmpl;
                struct fcpio_echo_cmpl          echo_cmpl;
                struct fcpio_lunmap_chng        lunmap_chng;
                struct fcpio_lunmap_req_cmpl    lunmap_req_cmpl;
        } u;
};

/*
 * Access routines to encode and decode the color bit, which is the most
 * significant bit of the MSB of the structure
 */
static inline void fcpio_color_enc(struct fcpio_fw_req *fw_req, u8 color)
{
        u8 *c = ((u8 *) fw_req) + sizeof(struct fcpio_fw_req) - 1;

        if (color)
                *c |= 0x80;
        else
                *c &= ~0x80;
}

static inline void fcpio_color_dec(struct fcpio_fw_req *fw_req, u8 *color)
{
        u8 *c = ((u8 *) fw_req) + sizeof(struct fcpio_fw_req) - 1;

        *color = *c >> 7;

        /*
         * Make sure color bit is read from desc *before* other fields
         * are read from desc.  Hardware guarantees color bit is last
         * bit (byte) written.  Adding the rmb() prevents the compiler
         * and/or CPU from reordering the reads which would potentially
         * result in reading stale values.
         */

        rmb();

}

/*
 * Lunmap table entry for scsi vnics
 */
#define FCPIO_LUNMAP_TABLE_SIZE     256
#define FCPIO_FLAGS_LUNMAP_VALID    0x80
#define FCPIO_FLAGS_BOOT            0x01
struct fcpio_lunmap_entry {
        u8    bus;
        u8    target;
        u8    lun;
        u8    path_cnt;
        u16   flags;
        u16   update_cnt;
};

struct fcpio_lunmap_tbl {
        u32                   update_cnt;
        struct fcpio_lunmap_entry   lunmaps[FCPIO_LUNMAP_TABLE_SIZE];
};

#endif /* _FCPIO_H_ */