[fc] Add support for Fibre Channel name server lookups

Signed-off-by: Michael Brown <mcb30@ipxe.org>

1 files changed, 240 insertions, 0 deletions

diff --git a/src/net/fcns.c b/src/net/fcns.c
new file mode 100644
index 00000000..7769e255
--- /dev/null
+++ b/src/net/fcns.c
@@ -0,0 +1,240 @@
+/*
+ * 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;
+}