153 lines
3.6 KiB
C
153 lines
3.6 KiB
C
/*
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* Copyright(c) 2008 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Maintained at www.Open-FCoE.org
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*/
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/*
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* Provide interface to send ELS/CT FC frames
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*/
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#include <linux/export.h>
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#include <asm/unaligned.h>
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#include <scsi/fc/fc_gs.h>
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#include <scsi/fc/fc_ns.h>
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#include <scsi/fc/fc_els.h>
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#include <scsi/libfc.h>
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#include <scsi/fc_encode.h>
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#include "fc_libfc.h"
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/**
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* fc_elsct_send() - Send an ELS or CT frame
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* @lport: The local port to send the frame on
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* @did: The destination ID for the frame
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* @fp: The frame to be sent
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* @op: The operational code
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* @resp: The callback routine when the response is received
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* @arg: The argument to pass to the response callback routine
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* @timer_msec: The timeout period for the frame (in msecs)
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*/
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struct fc_seq *fc_elsct_send(struct fc_lport *lport, u32 did,
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struct fc_frame *fp, unsigned int op,
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void (*resp)(struct fc_seq *,
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struct fc_frame *,
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void *),
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void *arg, u32 timer_msec)
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{
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enum fc_rctl r_ctl;
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enum fc_fh_type fh_type;
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int rc;
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/* ELS requests */
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if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS))
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rc = fc_els_fill(lport, did, fp, op, &r_ctl, &fh_type);
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else {
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/* CT requests */
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rc = fc_ct_fill(lport, did, fp, op, &r_ctl, &fh_type, &did);
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}
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if (rc) {
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fc_frame_free(fp);
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return NULL;
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}
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fc_fill_fc_hdr(fp, r_ctl, did, lport->port_id, fh_type,
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FC_FCTL_REQ, 0);
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return lport->tt.exch_seq_send(lport, fp, resp, NULL, arg, timer_msec);
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}
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EXPORT_SYMBOL(fc_elsct_send);
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/**
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* fc_elsct_init() - Initialize the ELS/CT layer
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* @lport: The local port to initialize the ELS/CT layer for
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*/
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int fc_elsct_init(struct fc_lport *lport)
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{
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if (!lport->tt.elsct_send)
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lport->tt.elsct_send = fc_elsct_send;
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return 0;
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}
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EXPORT_SYMBOL(fc_elsct_init);
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/**
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* fc_els_resp_type() - Return a string describing the ELS response
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* @fp: The frame pointer or possible error code
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*/
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const char *fc_els_resp_type(struct fc_frame *fp)
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{
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const char *msg;
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struct fc_frame_header *fh;
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struct fc_ct_hdr *ct;
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if (IS_ERR(fp)) {
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switch (-PTR_ERR(fp)) {
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case FC_NO_ERR:
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msg = "response no error";
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break;
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case FC_EX_TIMEOUT:
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msg = "response timeout";
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break;
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case FC_EX_CLOSED:
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msg = "response closed";
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break;
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default:
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msg = "response unknown error";
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break;
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}
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} else {
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fh = fc_frame_header_get(fp);
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switch (fh->fh_type) {
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case FC_TYPE_ELS:
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switch (fc_frame_payload_op(fp)) {
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case ELS_LS_ACC:
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msg = "accept";
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break;
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case ELS_LS_RJT:
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msg = "reject";
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break;
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default:
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msg = "response unknown ELS";
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break;
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}
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break;
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case FC_TYPE_CT:
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ct = fc_frame_payload_get(fp, sizeof(*ct));
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if (ct) {
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switch (ntohs(ct->ct_cmd)) {
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case FC_FS_ACC:
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msg = "CT accept";
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break;
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case FC_FS_RJT:
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msg = "CT reject";
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break;
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default:
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msg = "response unknown CT";
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break;
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}
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} else {
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msg = "short CT response";
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}
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break;
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default:
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msg = "response not ELS or CT";
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break;
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}
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}
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return msg;
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}
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