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/*
* Copyright (C) 2010 Michael Brown <mbrown@fensystems.co.uk>.
*
* 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 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <byteswap.h>
#include <ipxe/interface.h>
#include <ipxe/iobuf.h>
#include <ipxe/process.h>
#include <ipxe/xfer.h>
#include <ipxe/fc.h>
#include <ipxe/fcns.h>
/** @file
*
* Fibre Channel name server lookups
*
*/
/** A Fibre Channel name server query */
struct fc_ns_query {
/** Reference count */
struct refcnt refcnt;
/** Fibre Channel exchange */
struct interface xchg;
/** Fibre Channel peer */
struct fc_peer *peer;
/** Fibre Channel port */
struct fc_port *port;
/** Process */
struct process process;
/** Success handler
*
* @v peer Fibre Channel peer
* @v port Fibre Channel port
* @v peer_port_id Peer port ID
* @ret rc Return status code
*/
int ( * done ) ( struct fc_peer *peer, struct fc_port *port,
struct fc_port_id *peer_port_id );
};
/**
* Free name server query
*
* @v refcnt Reference count
*/
static void fc_ns_query_free ( struct refcnt *refcnt ) {
struct fc_ns_query *query =
container_of ( refcnt, struct fc_ns_query, refcnt );
fc_peer_put ( query->peer );
fc_port_put ( query->port );
free ( query );
}
/**
* Close name server query
*
* @v query Name server query
* @v rc Reason for close
*/
static void fc_ns_query_close ( struct fc_ns_query *query, int rc ) {
/* Stop process */
process_del ( &query->process );
/* Shut down interfaces */
intf_shutdown ( &query->xchg, rc );
}
/**
* Receive name server query response
*
* @v query Name server query
* @v iobuf I/O buffer
* @v meta Data transfer metadata
* @ret rc Return status code
*/
static int fc_ns_query_deliver ( struct fc_ns_query *query,
struct io_buffer *iobuf,
struct xfer_metadata *meta __unused ) {
union fc_ns_response *resp = iobuf->data;
struct fc_port_id *peer_port_id;
int rc;
/* Sanity check */
if ( iob_len ( iobuf ) < sizeof ( resp->ct ) ) {
DBGC ( query, "FCNS %p received underlength response (%zd "
"bytes)\n", query, iob_len ( iobuf ) );
rc = -EINVAL;
goto done;
}
/* Handle response */
switch ( ntohs ( resp->ct.code ) ) {
case FC_GS_ACCEPT:
if ( iob_len ( iobuf ) < sizeof ( resp->gid_pn ) ) {
DBGC ( query, "FCNS %p received underlength accept "
"response (%zd bytes)\n",
query, iob_len ( iobuf ) );
rc = -EINVAL;
goto done;
}
peer_port_id = &resp->gid_pn.port_id.port_id;
DBGC ( query, "FCNS %p resolved %s to %s via %s\n",
query, fc_ntoa ( &query->peer->port_wwn ),
fc_id_ntoa ( peer_port_id ), query->port->name );
if ( ( rc = query->done ( query->peer, query->port,
peer_port_id ) ) != 0 )
goto done;
break;
case FC_GS_REJECT:
DBGC ( query, "FCNS %p rejected (reason %02x explanation "
"%02x)\n", query, resp->reject.ct.reason,
resp->reject.ct.explanation );
break;
default:
DBGC ( query, "FCNS %p received invalid response code %04x\n",
query, ntohs ( resp->ct.code ) );
rc = -ENOTSUP;
goto done;
}
rc = 0;
done:
free_iob ( iobuf );
fc_ns_query_close ( query, rc );
return rc;
}
/**
* Name server query process
*
* @v process Process
*/
static void fc_ns_query_step ( struct process *process ) {
struct fc_ns_query *query =
container_of ( process, struct fc_ns_query, process );
struct xfer_metadata meta;
struct fc_ns_gid_pn_request gid_pn;
int xchg_id;
int rc;
/* Stop process */
process_del ( &query->process );
/* Create exchange */
if ( ( xchg_id = fc_xchg_originate ( &query->xchg, query->port,
&fc_gs_port_id,
FC_TYPE_CT ) ) < 0 ) {
rc = xchg_id;
DBGC ( query, "FCNS %p could not create exchange: %s\n",
query, strerror ( rc ) );
fc_ns_query_close ( query, rc );
return;
}
/* Construct query request */
memset ( &gid_pn, 0, sizeof ( gid_pn ) );
gid_pn.ct.revision = FC_CT_REVISION;
gid_pn.ct.type = FC_GS_TYPE_DS;
gid_pn.ct.subtype = FC_DS_SUBTYPE_NAME;
gid_pn.ct.code = htons ( FC_NS_GET ( FC_NS_PORT_NAME, FC_NS_PORT_ID ));
memcpy ( &gid_pn.port_wwn, &query->peer->port_wwn,
sizeof ( gid_pn.port_wwn ) );
memset ( &meta, 0, sizeof ( meta ) );
meta.flags = XFER_FL_OVER;
/* Send query */
if ( ( rc = xfer_deliver_raw_meta ( &query->xchg, &gid_pn,
sizeof ( gid_pn ), &meta ) ) != 0){
DBGC ( query, "FCNS %p could not deliver query: %s\n",
query, strerror ( rc ) );
fc_ns_query_close ( query, rc );
return;
}
}
/** Name server exchange interface operations */
static struct interface_operation fc_ns_query_xchg_op[] = {
INTF_OP ( xfer_deliver, struct fc_ns_query *, fc_ns_query_deliver ),
INTF_OP ( intf_close, struct fc_ns_query *, fc_ns_query_close ),
};
/** Name server exchange interface descriptor */
static struct interface_descriptor fc_ns_query_xchg_desc =
INTF_DESC ( struct fc_ns_query, xchg, fc_ns_query_xchg_op );
/**
* Issue Fibre Channel name server query
*
* @v peer Fibre Channel peer
* @v port Fibre Channel port
* @ret rc Return status code
*/
int fc_ns_query ( struct fc_peer *peer, struct fc_port *port,
int ( * done ) ( struct fc_peer *peer, struct fc_port *port,
struct fc_port_id *peer_port_id ) ) {
struct fc_ns_query *query;
/* Allocate and initialise structure */
query = zalloc ( sizeof ( *query ) );
if ( ! query )
return -ENOMEM;
ref_init ( &query->refcnt, fc_ns_query_free );
intf_init ( &query->xchg, &fc_ns_query_xchg_desc, &query->refcnt );
process_init ( &query->process, fc_ns_query_step, &query->refcnt );
query->peer = fc_peer_get ( peer );
query->port = fc_port_get ( port );
query->done = done;
DBGC ( query, "FCNS %p querying %s via %s\n",
query, fc_ntoa ( &query->peer->port_wwn ), port->name );
/* Mortalise self and return */
ref_put ( &query->refcnt );
return 0;
}
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