--- /dev/null
+/*
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, 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 query Name server query
+ */
+static void fc_ns_query_step ( struct fc_ns_query *query ) {
+ struct xfer_metadata meta;
+ struct fc_ns_gid_pn_request gid_pn;
+ int xchg_id;
+ int rc;
+
+ /* 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 );
+
+/** Name server process descriptor */
+static struct process_descriptor fc_ns_query_process_desc =
+ PROC_DESC_ONCE ( struct fc_ns_query, process, fc_ns_query_step );
+
+/**
+ * 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_process_desc,
+ &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;
+}
Code Review / kvmfornfv.git / blobdiff