fc_encode.h

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/*
 * Copyright(c) 2008 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 _FC_ENCODE_H_
#define _FC_ENCODE_H_
#include <asm/unaligned.h>
#include <linux/utsname.h>

/*
 * F_CTL values for simple requests and responses.
 */
#define FC_FCTL_REQ (FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT)
#define FC_FCTL_RESP    (FC_FC_EX_CTX | FC_FC_LAST_SEQ | \
            FC_FC_END_SEQ | FC_FC_SEQ_INIT)

struct fc_ns_rft {
    struct fc_ns_fid fid;   /* port ID object */
    struct fc_ns_fts fts;   /* FC4-types object */
};

struct fc_ct_req {
    struct fc_ct_hdr hdr;
    union {
        struct fc_ns_gid_ft gid;
        struct fc_ns_rn_id  rn;
        struct fc_ns_rft rft;
        struct fc_ns_rff_id rff;
        struct fc_ns_fid fid;
        struct fc_ns_rsnn snn;
        struct fc_ns_rspn spn;
        struct fc_fdmi_rhba rhba;
        struct fc_fdmi_rpa  rpa;
        struct fc_fdmi_dprt dprt;
        struct fc_fdmi_dhba dhba;
    } payload;
};

static inline void __fc_fill_fc_hdr(struct fc_frame_header *fh,
                    enum fc_rctl r_ctl,
                    u32 did, u32 sid, enum fc_fh_type type,
                    u32 f_ctl, u32 parm_offset)
{
    WARN_ON(r_ctl == 0);
    fh->fh_r_ctl = r_ctl;
    hton24(fh->fh_d_id, did);
    hton24(fh->fh_s_id, sid);
    fh->fh_type = type;
    hton24(fh->fh_f_ctl, f_ctl);
    fh->fh_cs_ctl = 0;
    fh->fh_df_ctl = 0;
    fh->fh_parm_offset = htonl(parm_offset);
}

static inline void fc_fill_fc_hdr(struct fc_frame *fp, enum fc_rctl r_ctl,
                  u32 did, u32 sid, enum fc_fh_type type,
                  u32 f_ctl, u32 parm_offset)
{
    struct fc_frame_header *fh;

    fh = fc_frame_header_get(fp);
    __fc_fill_fc_hdr(fh, r_ctl, did, sid, type, f_ctl, parm_offset);
}

static inline void fc_adisc_fill(struct fc_lport *lport, struct fc_frame *fp)
{
    struct fc_els_adisc *adisc;

    adisc = fc_frame_payload_get(fp, sizeof(*adisc));
    memset(adisc, 0, sizeof(*adisc));
    adisc->adisc_cmd = ELS_ADISC;
    put_unaligned_be64(lport->wwpn, &adisc->adisc_wwpn);
    put_unaligned_be64(lport->wwnn, &adisc->adisc_wwnn);
    hton24(adisc->adisc_port_id, lport->port_id);
}

static inline struct fc_ct_req *fc_ct_hdr_fill(const struct fc_frame *fp,
                           unsigned int op, size_t req_size,
                           enum fc_ct_fs_type fs_type,
                           u8 subtype)
{
    struct fc_ct_req *ct;
    size_t ct_plen;

    ct_plen  = sizeof(struct fc_ct_hdr) + req_size;
    ct = fc_frame_payload_get(fp, ct_plen);
    memset(ct, 0, ct_plen);
    ct->hdr.ct_rev = FC_CT_REV;
    ct->hdr.ct_fs_type = fs_type;
    ct->hdr.ct_fs_subtype = subtype;
    ct->hdr.ct_cmd = htons((u16) op);
    return ct;
}

static inline int fc_ct_ns_fill(struct fc_lport *lport,
              u32 fc_id, struct fc_frame *fp,
              unsigned int op, enum fc_rctl *r_ctl,
              enum fc_fh_type *fh_type)
{
    struct fc_ct_req *ct;
    size_t len;

    switch (op) {
    case FC_NS_GPN_FT:
        ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_gid_ft),
                    FC_FST_DIR, FC_NS_SUBTYPE);
        ct->payload.gid.fn_fc4_type = FC_TYPE_FCP;
        break;

    case FC_NS_GPN_ID:
        ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_fid),
                    FC_FST_DIR, FC_NS_SUBTYPE);
        ct->payload.gid.fn_fc4_type = FC_TYPE_FCP;
        hton24(ct->payload.fid.fp_fid, fc_id);
        break;

    case FC_NS_RFT_ID:
        ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rft),
                    FC_FST_DIR, FC_NS_SUBTYPE);
        hton24(ct->payload.rft.fid.fp_fid, lport->port_id);
        ct->payload.rft.fts = lport->fcts;
        break;

    case FC_NS_RFF_ID:
        ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rff_id),
                    FC_FST_DIR, FC_NS_SUBTYPE);
        hton24(ct->payload.rff.fr_fid.fp_fid, lport->port_id);
        ct->payload.rff.fr_type = FC_TYPE_FCP;
        if (lport->service_params & FCP_SPPF_INIT_FCN)
            ct->payload.rff.fr_feat = FCP_FEAT_INIT;
        if (lport->service_params & FCP_SPPF_TARG_FCN)
            ct->payload.rff.fr_feat |= FCP_FEAT_TARG;
        break;

    case FC_NS_RNN_ID:
        ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rn_id),
                    FC_FST_DIR, FC_NS_SUBTYPE);
        hton24(ct->payload.rn.fr_fid.fp_fid, lport->port_id);
        put_unaligned_be64(lport->wwnn, &ct->payload.rn.fr_wwn);
        break;

    case FC_NS_RSPN_ID:
        len = strnlen(fc_host_symbolic_name(lport->host), 255);
        ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rspn) + len,
                    FC_FST_DIR, FC_NS_SUBTYPE);
        hton24(ct->payload.spn.fr_fid.fp_fid, lport->port_id);
        strncpy(ct->payload.spn.fr_name,
            fc_host_symbolic_name(lport->host), len);
        ct->payload.spn.fr_name_len = len;
        break;

    case FC_NS_RSNN_NN:
        len = strnlen(fc_host_symbolic_name(lport->host), 255);
        ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rsnn) + len,
                    FC_FST_DIR, FC_NS_SUBTYPE);
        put_unaligned_be64(lport->wwnn, &ct->payload.snn.fr_wwn);
        strncpy(ct->payload.snn.fr_name,
            fc_host_symbolic_name(lport->host), len);
        ct->payload.snn.fr_name_len = len;
        break;

    default:
        return -EINVAL;
    }
    *r_ctl = FC_RCTL_DD_UNSOL_CTL;
    *fh_type = FC_TYPE_CT;
    return 0;
}

static inline int fc_ct_ms_fill(struct fc_lport *lport,
              u32 fc_id, struct fc_frame *fp,
              unsigned int op, enum fc_rctl *r_ctl,
              enum fc_fh_type *fh_type)
{
    struct fc_ct_req *ct;
    size_t len;
    struct fc_fdmi_attr_entry *entry;
    struct fs_fdmi_attrs *hba_attrs;
    int numattrs = 0;

    switch (op) {
    case FC_FDMI_RHBA:
        numattrs = 10;
        len = sizeof(struct fc_fdmi_rhba);
        len -= sizeof(struct fc_fdmi_attr_entry);
        len += (numattrs * FC_FDMI_ATTR_ENTRY_HEADER_LEN);
        len += FC_FDMI_HBA_ATTR_NODENAME_LEN;
        len += FC_FDMI_HBA_ATTR_MANUFACTURER_LEN;
        len += FC_FDMI_HBA_ATTR_SERIALNUMBER_LEN;
        len += FC_FDMI_HBA_ATTR_MODEL_LEN;
        len += FC_FDMI_HBA_ATTR_MODELDESCR_LEN;
        len += FC_FDMI_HBA_ATTR_HARDWAREVERSION_LEN;
        len += FC_FDMI_HBA_ATTR_DRIVERVERSION_LEN;
        len += FC_FDMI_HBA_ATTR_OPTIONROMVERSION_LEN;
        len += FC_FDMI_HBA_ATTR_FIRMWAREVERSION_LEN;
        len += FC_FDMI_HBA_ATTR_OSNAMEVERSION_LEN;
        ct = fc_ct_hdr_fill(fp, op, len, FC_FST_MGMT,
                    FC_FDMI_SUBTYPE);

        /* HBA Identifier */
        put_unaligned_be64(lport->wwpn, &ct->payload.rhba.hbaid.id);
        /* Number of Ports - always 1 */
        put_unaligned_be32(1, &ct->payload.rhba.port.numport);
        /* Port Name */
        put_unaligned_be64(lport->wwpn,
                   &ct->payload.rhba.port.port[0].portname);

        /* HBA Attributes */
        put_unaligned_be32(numattrs,
                   &ct->payload.rhba.hba_attrs.numattrs);
        hba_attrs = &ct->payload.rhba.hba_attrs;
        entry = (struct fc_fdmi_attr_entry *)hba_attrs->attr;
        /* NodeName*/
        len = FC_FDMI_ATTR_ENTRY_HEADER_LEN;
        len += FC_FDMI_HBA_ATTR_NODENAME_LEN;
        put_unaligned_be16(FC_FDMI_HBA_ATTR_NODENAME,
                   &entry->type);
        put_unaligned_be16(len, &entry->len);
        put_unaligned_be64(lport->wwnn,
                   (__be64 *)&entry->value[0]);

        /* Manufacturer */
        entry = (struct fc_fdmi_attr_entry *)((char *)entry->value +
                    FC_FDMI_HBA_ATTR_NODENAME_LEN);
        len = FC_FDMI_ATTR_ENTRY_HEADER_LEN;
        len += FC_FDMI_HBA_ATTR_MANUFACTURER_LEN;
        put_unaligned_be16(FC_FDMI_HBA_ATTR_MANUFACTURER,
                   &entry->type);
        put_unaligned_be16(len, &entry->len);
        strncpy((char *)&entry->value,
            fc_host_manufacturer(lport->host),
            FC_FDMI_HBA_ATTR_MANUFACTURER_LEN);

        /* SerialNumber */
        entry = (struct fc_fdmi_attr_entry *)((char *)entry->value +
                    FC_FDMI_HBA_ATTR_MANUFACTURER_LEN);
        len = FC_FDMI_ATTR_ENTRY_HEADER_LEN;
        len += FC_FDMI_HBA_ATTR_SERIALNUMBER_LEN;
        put_unaligned_be16(FC_FDMI_HBA_ATTR_SERIALNUMBER,
                   &entry->type);
        put_unaligned_be16(len, &entry->len);
        strncpy((char *)&entry->value,
            fc_host_serial_number(lport->host),
            FC_FDMI_HBA_ATTR_SERIALNUMBER_LEN);

        /* Model */
        entry = (struct fc_fdmi_attr_entry *)((char *)entry->value +
                    FC_FDMI_HBA_ATTR_SERIALNUMBER_LEN);
        len = FC_FDMI_ATTR_ENTRY_HEADER_LEN;
        len += FC_FDMI_HBA_ATTR_MODEL_LEN;
        put_unaligned_be16(FC_FDMI_HBA_ATTR_MODEL,
                   &entry->type);
        put_unaligned_be16(len, &entry->len);
        strncpy((char *)&entry->value,
            fc_host_model(lport->host),
            FC_FDMI_HBA_ATTR_MODEL_LEN);

        /* Model Description */
        entry = (struct fc_fdmi_attr_entry *)((char *)entry->value +
                    FC_FDMI_HBA_ATTR_MODEL_LEN);
        len = FC_FDMI_ATTR_ENTRY_HEADER_LEN;
        len += FC_FDMI_HBA_ATTR_MODELDESCR_LEN;
        put_unaligned_be16(FC_FDMI_HBA_ATTR_MODELDESCRIPTION,
                   &entry->type);
        put_unaligned_be16(len, &entry->len);
        strncpy((char *)&entry->value,
            fc_host_model_description(lport->host),
            FC_FDMI_HBA_ATTR_MODELDESCR_LEN);

        /* Hardware Version */
        entry = (struct fc_fdmi_attr_entry *)((char *)entry->value +
                    FC_FDMI_HBA_ATTR_MODELDESCR_LEN);
        len = FC_FDMI_ATTR_ENTRY_HEADER_LEN;
        len += FC_FDMI_HBA_ATTR_HARDWAREVERSION_LEN;
        put_unaligned_be16(FC_FDMI_HBA_ATTR_HARDWAREVERSION,
                   &entry->type);
        put_unaligned_be16(len, &entry->len);
        strncpy((char *)&entry->value,
            fc_host_hardware_version(lport->host),
            FC_FDMI_HBA_ATTR_HARDWAREVERSION_LEN);

        /* Driver Version */
        entry = (struct fc_fdmi_attr_entry *)((char *)entry->value +
                    FC_FDMI_HBA_ATTR_HARDWAREVERSION_LEN);
        len = FC_FDMI_ATTR_ENTRY_HEADER_LEN;
        len += FC_FDMI_HBA_ATTR_DRIVERVERSION_LEN;
        put_unaligned_be16(FC_FDMI_HBA_ATTR_DRIVERVERSION,
                   &entry->type);
        put_unaligned_be16(len, &entry->len);
        strncpy((char *)&entry->value,
            fc_host_driver_version(lport->host),
            FC_FDMI_HBA_ATTR_DRIVERVERSION_LEN);

        /* OptionROM Version */
        entry = (struct fc_fdmi_attr_entry *)((char *)entry->value +
                    FC_FDMI_HBA_ATTR_DRIVERVERSION_LEN);
        len = FC_FDMI_ATTR_ENTRY_HEADER_LEN;
        len += FC_FDMI_HBA_ATTR_OPTIONROMVERSION_LEN;
        put_unaligned_be16(FC_FDMI_HBA_ATTR_OPTIONROMVERSION,
                   &entry->type);
        put_unaligned_be16(len, &entry->len);
        strncpy((char *)&entry->value,
            fc_host_optionrom_version(lport->host),
            FC_FDMI_HBA_ATTR_OPTIONROMVERSION_LEN);

        /* Firmware Version */
        entry = (struct fc_fdmi_attr_entry *)((char *)entry->value +
                    FC_FDMI_HBA_ATTR_OPTIONROMVERSION_LEN);
        len = FC_FDMI_ATTR_ENTRY_HEADER_LEN;
        len += FC_FDMI_HBA_ATTR_FIRMWAREVERSION_LEN;
        put_unaligned_be16(FC_FDMI_HBA_ATTR_FIRMWAREVERSION,
                   &entry->type);
        put_unaligned_be16(len, &entry->len);
        strncpy((char *)&entry->value,
            fc_host_firmware_version(lport->host),
            FC_FDMI_HBA_ATTR_FIRMWAREVERSION_LEN);

        /* OS Name and Version */
        entry = (struct fc_fdmi_attr_entry *)((char *)entry->value +
                    FC_FDMI_HBA_ATTR_FIRMWAREVERSION_LEN);
        len = FC_FDMI_ATTR_ENTRY_HEADER_LEN;
        len += FC_FDMI_HBA_ATTR_OSNAMEVERSION_LEN;
        put_unaligned_be16(FC_FDMI_HBA_ATTR_OSNAMEVERSION,
                   &entry->type);
        put_unaligned_be16(len, &entry->len);
        snprintf((char *)&entry->value,
            FC_FDMI_HBA_ATTR_OSNAMEVERSION_LEN,
            "%s v%s",
            init_utsname()->sysname,
            init_utsname()->release);
        break;
    case FC_FDMI_RPA:
        numattrs = 6;
        len = sizeof(struct fc_fdmi_rpa);
        len -= sizeof(struct fc_fdmi_attr_entry);
        len += (numattrs * FC_FDMI_ATTR_ENTRY_HEADER_LEN);
        len += FC_FDMI_PORT_ATTR_FC4TYPES_LEN;
        len += FC_FDMI_PORT_ATTR_SUPPORTEDSPEED_LEN;
        len += FC_FDMI_PORT_ATTR_CURRENTPORTSPEED_LEN;
        len += FC_FDMI_PORT_ATTR_MAXFRAMESIZE_LEN;
        len += FC_FDMI_PORT_ATTR_OSDEVICENAME_LEN;
        len += FC_FDMI_PORT_ATTR_HOSTNAME_LEN;
        ct = fc_ct_hdr_fill(fp, op, len, FC_FST_MGMT,
                    FC_FDMI_SUBTYPE);

        /* Port Name */
        put_unaligned_be64(lport->wwpn,
                   &ct->payload.rpa.port.portname);

        /* Port Attributes */
        put_unaligned_be32(numattrs,
                   &ct->payload.rpa.hba_attrs.numattrs);

        hba_attrs = &ct->payload.rpa.hba_attrs;
        entry = (struct fc_fdmi_attr_entry *)hba_attrs->attr;

        /* FC4 types */
        len = FC_FDMI_ATTR_ENTRY_HEADER_LEN;
        len += FC_FDMI_PORT_ATTR_FC4TYPES_LEN;
        put_unaligned_be16(FC_FDMI_PORT_ATTR_FC4TYPES,
                   &entry->type);
        put_unaligned_be16(len, &entry->len);
        memcpy(&entry->value, fc_host_supported_fc4s(lport->host),
               FC_FDMI_PORT_ATTR_FC4TYPES_LEN);

        /* Supported Speed */
        entry = (struct fc_fdmi_attr_entry *)((char *)entry->value +
                    FC_FDMI_PORT_ATTR_FC4TYPES_LEN);
        len = FC_FDMI_ATTR_ENTRY_HEADER_LEN;
        len += FC_FDMI_PORT_ATTR_SUPPORTEDSPEED_LEN;
        put_unaligned_be16(FC_FDMI_PORT_ATTR_SUPPORTEDSPEED,
                   &entry->type);
        put_unaligned_be16(len, &entry->len);

        put_unaligned_be32(fc_host_supported_speeds(lport->host),
                   &entry->value);

        /* Current Port Speed */
        entry = (struct fc_fdmi_attr_entry *)((char *)entry->value +
                    FC_FDMI_PORT_ATTR_SUPPORTEDSPEED_LEN);
        len = FC_FDMI_ATTR_ENTRY_HEADER_LEN;
        len += FC_FDMI_PORT_ATTR_CURRENTPORTSPEED_LEN;
        put_unaligned_be16(FC_FDMI_PORT_ATTR_CURRENTPORTSPEED,
                   &entry->type);
        put_unaligned_be16(len, &entry->len);
        put_unaligned_be32(lport->link_speed,
                   &entry->value);

        /* Max Frame Size */
        entry = (struct fc_fdmi_attr_entry *)((char *)entry->value +
                    FC_FDMI_PORT_ATTR_CURRENTPORTSPEED_LEN);
        len = FC_FDMI_ATTR_ENTRY_HEADER_LEN;
        len += FC_FDMI_PORT_ATTR_MAXFRAMESIZE_LEN;
        put_unaligned_be16(FC_FDMI_PORT_ATTR_MAXFRAMESIZE,
                   &entry->type);
        put_unaligned_be16(len, &entry->len);
        put_unaligned_be32(fc_host_maxframe_size(lport->host),
                   &entry->value);

        /* OS Device Name */
        entry = (struct fc_fdmi_attr_entry *)((char *)entry->value +
                    FC_FDMI_PORT_ATTR_MAXFRAMESIZE_LEN);
        len = FC_FDMI_ATTR_ENTRY_HEADER_LEN;
        len += FC_FDMI_PORT_ATTR_OSDEVICENAME_LEN;
        put_unaligned_be16(FC_FDMI_PORT_ATTR_OSDEVICENAME,
                   &entry->type);
        put_unaligned_be16(len, &entry->len);
        /* Use the sysfs device name */
        strncpy((char *)&entry->value,
            dev_name(&lport->host->shost_gendev),
            strnlen(dev_name(&lport->host->shost_gendev),
                FC_FDMI_PORT_ATTR_HOSTNAME_LEN));

        /* Host Name */
        entry = (struct fc_fdmi_attr_entry *)((char *)entry->value +
                    FC_FDMI_PORT_ATTR_OSDEVICENAME_LEN);
        len = FC_FDMI_ATTR_ENTRY_HEADER_LEN;
        len += FC_FDMI_PORT_ATTR_HOSTNAME_LEN;
        put_unaligned_be16(FC_FDMI_PORT_ATTR_HOSTNAME,
                   &entry->type);
        put_unaligned_be16(len, &entry->len);
        if (strlen(fc_host_system_hostname(lport->host)))
            strncpy((char *)&entry->value,
                fc_host_system_hostname(lport->host),
                strnlen(fc_host_system_hostname(lport->host),
                    FC_FDMI_PORT_ATTR_HOSTNAME_LEN));
        else
            strncpy((char *)&entry->value,
                init_utsname()->nodename,
                FC_FDMI_PORT_ATTR_HOSTNAME_LEN);
        break;
    case FC_FDMI_DPRT:
        len = sizeof(struct fc_fdmi_dprt);
        ct = fc_ct_hdr_fill(fp, op, len, FC_FST_MGMT,
                    FC_FDMI_SUBTYPE);
        /* Port Name */
        put_unaligned_be64(lport->wwpn,
                   &ct->payload.dprt.port.portname);
        break;
    case FC_FDMI_DHBA:
        len = sizeof(struct fc_fdmi_dhba);
        ct = fc_ct_hdr_fill(fp, op, len, FC_FST_MGMT,
                    FC_FDMI_SUBTYPE);
        /* HBA Identifier */
        put_unaligned_be64(lport->wwpn, &ct->payload.dhba.hbaid.id);
        break;
    default:
        return -EINVAL;
    }
    *r_ctl = FC_RCTL_DD_UNSOL_CTL;
    *fh_type = FC_TYPE_CT;
    return 0;
}

static inline int fc_ct_fill(struct fc_lport *lport,
              u32 fc_id, struct fc_frame *fp,
              unsigned int op, enum fc_rctl *r_ctl,
              enum fc_fh_type *fh_type, u32 *did)
{
    int rc = -EINVAL;

    switch (fc_id) {
    case FC_FID_MGMT_SERV:
        rc = fc_ct_ms_fill(lport, fc_id, fp, op, r_ctl, fh_type);
        *did = FC_FID_MGMT_SERV;
        break;
    case FC_FID_DIR_SERV:
    default:
        rc = fc_ct_ns_fill(lport, fc_id, fp, op, r_ctl, fh_type);
        *did = FC_FID_DIR_SERV;
        break;
    }

    return rc;
}
static inline void fc_plogi_fill(struct fc_lport *lport, struct fc_frame *fp,
                 unsigned int op)
{
    struct fc_els_flogi *plogi;
    struct fc_els_csp *csp;
    struct fc_els_cssp *cp;

    plogi = fc_frame_payload_get(fp, sizeof(*plogi));
    memset(plogi, 0, sizeof(*plogi));
    plogi->fl_cmd = (u8) op;
    put_unaligned_be64(lport->wwpn, &plogi->fl_wwpn);
    put_unaligned_be64(lport->wwnn, &plogi->fl_wwnn);

    csp = &plogi->fl_csp;
    csp->sp_hi_ver = 0x20;
    csp->sp_lo_ver = 0x20;
    csp->sp_bb_cred = htons(10);    /* this gets set by gateway */
    csp->sp_bb_data = htons((u16) lport->mfs);
    cp = &plogi->fl_cssp[3 - 1];    /* class 3 parameters */
    cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
    csp->sp_features = htons(FC_SP_FT_CIRO);
    csp->sp_tot_seq = htons(255);   /* seq. we accept */
    csp->sp_rel_off = htons(0x1f);
    csp->sp_e_d_tov = htonl(lport->e_d_tov);

    cp->cp_rdfs = htons((u16) lport->mfs);
    cp->cp_con_seq = htons(255);
    cp->cp_open_seq = 1;
}

static inline void fc_flogi_fill(struct fc_lport *lport, struct fc_frame *fp)
{
    struct fc_els_csp *sp;
    struct fc_els_cssp *cp;
    struct fc_els_flogi *flogi;

    flogi = fc_frame_payload_get(fp, sizeof(*flogi));
    memset(flogi, 0, sizeof(*flogi));
    flogi->fl_cmd = (u8) ELS_FLOGI;
    put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn);
    put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn);
    sp = &flogi->fl_csp;
    sp->sp_hi_ver = 0x20;
    sp->sp_lo_ver = 0x20;
    sp->sp_bb_cred = htons(10); /* this gets set by gateway */
    sp->sp_bb_data = htons((u16) lport->mfs);
    cp = &flogi->fl_cssp[3 - 1];    /* class 3 parameters */
    cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
    if (lport->does_npiv)
        sp->sp_features = htons(FC_SP_FT_NPIV);
}

static inline void fc_fdisc_fill(struct fc_lport *lport, struct fc_frame *fp)
{
    struct fc_els_csp *sp;
    struct fc_els_cssp *cp;
    struct fc_els_flogi *fdisc;

    fdisc = fc_frame_payload_get(fp, sizeof(*fdisc));
    memset(fdisc, 0, sizeof(*fdisc));
    fdisc->fl_cmd = (u8) ELS_FDISC;
    put_unaligned_be64(lport->wwpn, &fdisc->fl_wwpn);
    put_unaligned_be64(lport->wwnn, &fdisc->fl_wwnn);
    sp = &fdisc->fl_csp;
    sp->sp_hi_ver = 0x20;
    sp->sp_lo_ver = 0x20;
    sp->sp_bb_cred = htons(10); /* this gets set by gateway */
    sp->sp_bb_data = htons((u16) lport->mfs);
    cp = &fdisc->fl_cssp[3 - 1];    /* class 3 parameters */
    cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
}

static inline void fc_logo_fill(struct fc_lport *lport, struct fc_frame *fp)
{
    struct fc_els_logo *logo;

    logo = fc_frame_payload_get(fp, sizeof(*logo));
    memset(logo, 0, sizeof(*logo));
    logo->fl_cmd = ELS_LOGO;
    hton24(logo->fl_n_port_id, lport->port_id);
    logo->fl_n_port_wwn = htonll(lport->wwpn);
}

static inline void fc_rtv_fill(struct fc_lport *lport, struct fc_frame *fp)
{
    struct fc_els_rtv *rtv;

    rtv = fc_frame_payload_get(fp, sizeof(*rtv));
    memset(rtv, 0, sizeof(*rtv));
    rtv->rtv_cmd = ELS_RTV;
}

static inline void fc_rec_fill(struct fc_lport *lport, struct fc_frame *fp)
{
    struct fc_els_rec *rec;
    struct fc_exch *ep = fc_seq_exch(fr_seq(fp));

    rec = fc_frame_payload_get(fp, sizeof(*rec));
    memset(rec, 0, sizeof(*rec));
    rec->rec_cmd = ELS_REC;
    hton24(rec->rec_s_id, lport->port_id);
    rec->rec_ox_id = htons(ep->oxid);
    rec->rec_rx_id = htons(ep->rxid);
}

static inline void fc_prli_fill(struct fc_lport *lport, struct fc_frame *fp)
{
    struct {
        struct fc_els_prli prli;
        struct fc_els_spp spp;
    } *pp;

    pp = fc_frame_payload_get(fp, sizeof(*pp));
    memset(pp, 0, sizeof(*pp));
    pp->prli.prli_cmd = ELS_PRLI;
    pp->prli.prli_spp_len = sizeof(struct fc_els_spp);
    pp->prli.prli_len = htons(sizeof(*pp));
    pp->spp.spp_type = FC_TYPE_FCP;
    pp->spp.spp_flags = FC_SPP_EST_IMG_PAIR;
    pp->spp.spp_params = htonl(lport->service_params);
}

static inline void fc_scr_fill(struct fc_lport *lport, struct fc_frame *fp)
{
    struct fc_els_scr *scr;

    scr = fc_frame_payload_get(fp, sizeof(*scr));
    memset(scr, 0, sizeof(*scr));
    scr->scr_cmd = ELS_SCR;
    scr->scr_reg_func = ELS_SCRF_FULL;
}

static inline int fc_els_fill(struct fc_lport *lport,
               u32 did,
               struct fc_frame *fp, unsigned int op,
               enum fc_rctl *r_ctl, enum fc_fh_type *fh_type)
{
    switch (op) {
    case ELS_ADISC:
        fc_adisc_fill(lport, fp);
        break;

    case ELS_PLOGI:
        fc_plogi_fill(lport, fp, ELS_PLOGI);
        break;

    case ELS_FLOGI:
        fc_flogi_fill(lport, fp);
        break;

    case ELS_FDISC:
        fc_fdisc_fill(lport, fp);
        break;

    case ELS_LOGO:
        fc_logo_fill(lport, fp);
        break;

    case ELS_RTV:
        fc_rtv_fill(lport, fp);
        break;

    case ELS_REC:
        fc_rec_fill(lport, fp);
        break;

    case ELS_PRLI:
        fc_prli_fill(lport, fp);
        break;

    case ELS_SCR:
        fc_scr_fill(lport, fp);
        break;

    default:
        return -EINVAL;
    }

    *r_ctl = FC_RCTL_ELS_REQ;
    *fh_type = FC_TYPE_ELS;
    return 0;
}
#endif /* _FC_ENCODE_H_ */