fc_elsct.c

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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
 */

/*
 * Provide interface to send ELS/CT FC frames
 */

#include <linux/export.h>
#include <asm/unaligned.h>
#include <scsi/fc/fc_gs.h>
#include <scsi/fc/fc_ns.h>
#include <scsi/fc/fc_els.h>
#include <scsi/libfc.h>
#include <scsi/fc_encode.h>
#include "fc_libfc.h"

struct fc_seq *fc_elsct_send(struct fc_lport *lport, u32 did,
                 struct fc_frame *fp, unsigned int op,
                 void (*resp)(struct fc_seq *,
                      struct fc_frame *,
                      void *),
                 void *arg, u32 timer_msec)
{
    enum fc_rctl r_ctl;
    enum fc_fh_type fh_type;
    int rc;

    /* ELS requests */
    if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS))
        rc = fc_els_fill(lport, did, fp, op, &r_ctl, &fh_type);
    else {
        /* CT requests */
        rc = fc_ct_fill(lport, did, fp, op, &r_ctl, &fh_type, &did);
    }

    if (rc) {
        fc_frame_free(fp);
        return NULL;
    }

    fc_fill_fc_hdr(fp, r_ctl, did, lport->port_id, fh_type,
               FC_FCTL_REQ, 0);

    return lport->tt.exch_seq_send(lport, fp, resp, NULL, arg, timer_msec);
}
EXPORT_SYMBOL(fc_elsct_send);

int fc_elsct_init(struct fc_lport *lport)
{
    if (!lport->tt.elsct_send)
        lport->tt.elsct_send = fc_elsct_send;

    return 0;
}
EXPORT_SYMBOL(fc_elsct_init);

const char *fc_els_resp_type(struct fc_frame *fp)
{
    const char *msg;
    struct fc_frame_header *fh;
    struct fc_ct_hdr *ct;

    if (IS_ERR(fp)) {
        switch (-PTR_ERR(fp)) {
        case FC_NO_ERR:
            msg = "response no error";
            break;
        case FC_EX_TIMEOUT:
            msg = "response timeout";
            break;
        case FC_EX_CLOSED:
            msg = "response closed";
            break;
        default:
            msg = "response unknown error";
            break;
        }
    } else {
        fh = fc_frame_header_get(fp);
        switch (fh->fh_type) {
        case FC_TYPE_ELS:
            switch (fc_frame_payload_op(fp)) {
            case ELS_LS_ACC:
                msg = "accept";
                break;
            case ELS_LS_RJT:
                msg = "reject";
                break;
            default:
                msg = "response unknown ELS";
                break;
            }
            break;
        case FC_TYPE_CT:
            ct = fc_frame_payload_get(fp, sizeof(*ct));
            if (ct) {
                switch (ntohs(ct->ct_cmd)) {
                case FC_FS_ACC:
                    msg = "CT accept";
                    break;
                case FC_FS_RJT:
                    msg = "CT reject";
                    break;
                default:
                    msg = "response unknown CT";
                    break;
                }
            } else {
                msg = "short CT response";
            }
            break;
        default:
            msg = "response not ELS or CT";
            break;
        }
    }
    return msg;
}