241 lines
6.5 KiB
C
241 lines
6.5 KiB
C
/*
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* Copyright (C) 2010 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <byteswap.h>
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#include <ipxe/interface.h>
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#include <ipxe/iobuf.h>
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#include <ipxe/process.h>
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#include <ipxe/xfer.h>
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#include <ipxe/fc.h>
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#include <ipxe/fcns.h>
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/** @file
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*
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* Fibre Channel name server lookups
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*
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*/
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/** A Fibre Channel name server query */
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struct fc_ns_query {
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/** Reference count */
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struct refcnt refcnt;
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/** Fibre Channel exchange */
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struct interface xchg;
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/** Fibre Channel peer */
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struct fc_peer *peer;
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/** Fibre Channel port */
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struct fc_port *port;
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/** Process */
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struct process process;
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/** Success handler
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*
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* @v peer Fibre Channel peer
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* @v port Fibre Channel port
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* @v peer_port_id Peer port ID
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* @ret rc Return status code
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*/
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int ( * done ) ( struct fc_peer *peer, struct fc_port *port,
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struct fc_port_id *peer_port_id );
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};
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/**
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* Free name server query
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*
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* @v refcnt Reference count
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*/
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static void fc_ns_query_free ( struct refcnt *refcnt ) {
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struct fc_ns_query *query =
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container_of ( refcnt, struct fc_ns_query, refcnt );
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fc_peer_put ( query->peer );
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fc_port_put ( query->port );
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free ( query );
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}
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/**
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* Close name server query
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*
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* @v query Name server query
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* @v rc Reason for close
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*/
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static void fc_ns_query_close ( struct fc_ns_query *query, int rc ) {
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/* Stop process */
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process_del ( &query->process );
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/* Shut down interfaces */
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intf_shutdown ( &query->xchg, rc );
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}
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/**
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* Receive name server query response
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*
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* @v query Name server query
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* @v iobuf I/O buffer
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* @v meta Data transfer metadata
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* @ret rc Return status code
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*/
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static int fc_ns_query_deliver ( struct fc_ns_query *query,
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struct io_buffer *iobuf,
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struct xfer_metadata *meta __unused ) {
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union fc_ns_response *resp = iobuf->data;
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struct fc_port_id *peer_port_id;
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int rc;
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/* Sanity check */
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if ( iob_len ( iobuf ) < sizeof ( resp->ct ) ) {
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DBGC ( query, "FCNS %p received underlength response (%zd "
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"bytes)\n", query, iob_len ( iobuf ) );
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rc = -EINVAL;
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goto done;
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}
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/* Handle response */
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switch ( ntohs ( resp->ct.code ) ) {
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case FC_GS_ACCEPT:
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if ( iob_len ( iobuf ) < sizeof ( resp->gid_pn ) ) {
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DBGC ( query, "FCNS %p received underlength accept "
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"response (%zd bytes)\n",
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query, iob_len ( iobuf ) );
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rc = -EINVAL;
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goto done;
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}
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peer_port_id = &resp->gid_pn.port_id.port_id;
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DBGC ( query, "FCNS %p resolved %s to %s via %s\n",
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query, fc_ntoa ( &query->peer->port_wwn ),
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fc_id_ntoa ( peer_port_id ), query->port->name );
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if ( ( rc = query->done ( query->peer, query->port,
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peer_port_id ) ) != 0 )
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goto done;
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break;
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case FC_GS_REJECT:
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DBGC ( query, "FCNS %p rejected (reason %02x explanation "
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"%02x)\n", query, resp->reject.ct.reason,
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resp->reject.ct.explanation );
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break;
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default:
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DBGC ( query, "FCNS %p received invalid response code %04x\n",
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query, ntohs ( resp->ct.code ) );
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rc = -ENOTSUP;
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goto done;
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}
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rc = 0;
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done:
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free_iob ( iobuf );
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fc_ns_query_close ( query, rc );
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return rc;
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}
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/**
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* Name server query process
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*
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* @v query Name server query
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*/
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static void fc_ns_query_step ( struct fc_ns_query *query ) {
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struct xfer_metadata meta;
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struct fc_ns_gid_pn_request gid_pn;
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int xchg_id;
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int rc;
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/* Create exchange */
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if ( ( xchg_id = fc_xchg_originate ( &query->xchg, query->port,
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&fc_gs_port_id,
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FC_TYPE_CT ) ) < 0 ) {
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rc = xchg_id;
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DBGC ( query, "FCNS %p could not create exchange: %s\n",
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query, strerror ( rc ) );
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fc_ns_query_close ( query, rc );
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return;
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}
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/* Construct query request */
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memset ( &gid_pn, 0, sizeof ( gid_pn ) );
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gid_pn.ct.revision = FC_CT_REVISION;
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gid_pn.ct.type = FC_GS_TYPE_DS;
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gid_pn.ct.subtype = FC_DS_SUBTYPE_NAME;
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gid_pn.ct.code = htons ( FC_NS_GET ( FC_NS_PORT_NAME, FC_NS_PORT_ID ));
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memcpy ( &gid_pn.port_wwn, &query->peer->port_wwn,
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sizeof ( gid_pn.port_wwn ) );
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memset ( &meta, 0, sizeof ( meta ) );
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meta.flags = XFER_FL_OVER;
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/* Send query */
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if ( ( rc = xfer_deliver_raw_meta ( &query->xchg, &gid_pn,
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sizeof ( gid_pn ), &meta ) ) != 0){
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DBGC ( query, "FCNS %p could not deliver query: %s\n",
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query, strerror ( rc ) );
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fc_ns_query_close ( query, rc );
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return;
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}
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}
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/** Name server exchange interface operations */
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static struct interface_operation fc_ns_query_xchg_op[] = {
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INTF_OP ( xfer_deliver, struct fc_ns_query *, fc_ns_query_deliver ),
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INTF_OP ( intf_close, struct fc_ns_query *, fc_ns_query_close ),
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};
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/** Name server exchange interface descriptor */
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static struct interface_descriptor fc_ns_query_xchg_desc =
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INTF_DESC ( struct fc_ns_query, xchg, fc_ns_query_xchg_op );
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/** Name server process descriptor */
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static struct process_descriptor fc_ns_query_process_desc =
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PROC_DESC_ONCE ( struct fc_ns_query, process, fc_ns_query_step );
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/**
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* Issue Fibre Channel name server query
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*
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* @v peer Fibre Channel peer
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* @v port Fibre Channel port
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* @ret rc Return status code
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*/
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int fc_ns_query ( struct fc_peer *peer, struct fc_port *port,
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int ( * done ) ( struct fc_peer *peer, struct fc_port *port,
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struct fc_port_id *peer_port_id ) ) {
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struct fc_ns_query *query;
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/* Allocate and initialise structure */
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query = zalloc ( sizeof ( *query ) );
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if ( ! query )
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return -ENOMEM;
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ref_init ( &query->refcnt, fc_ns_query_free );
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intf_init ( &query->xchg, &fc_ns_query_xchg_desc, &query->refcnt );
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process_init ( &query->process, &fc_ns_query_process_desc,
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&query->refcnt );
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query->peer = fc_peer_get ( peer );
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query->port = fc_port_get ( port );
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query->done = done;
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DBGC ( query, "FCNS %p querying %s via %s\n",
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query, fc_ntoa ( &query->peer->port_wwn ), port->name );
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/* Mortalise self and return */
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ref_put ( &query->refcnt );
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return 0;
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}
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