[fc] Add support for Fibre Channel devices

Add support for Fibre Channel ports, peers, and upper-layer protocols,
and for Fibre Channel extended link services.

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

1 files changed, 1162 insertions, 0 deletions

diff --git a/src/net/fcels.c b/src/net/fcels.c
new file mode 100644
index 00000000..63063ca3
--- /dev/null
+++ b/src/net/fcels.c
@@ -0,0 +1,1162 @@
+/*
+ * 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 <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+#include <byteswap.h>
+#include <ipxe/interface.h>
+#include <ipxe/xfer.h>
+#include <ipxe/iobuf.h>
+#include <ipxe/process.h>
+#include <ipxe/fc.h>
+#include <ipxe/fcels.h>
+
+/** @file
+ *
+ * Fibre Channel Extended Link Services
+ *
+ */
+
+/** Fibre Channel ELS transaction debug message format */
+#define FCELS_FMT "FCELS %s %s %s %s"
+
+/** Fibre Channel ELS transaction debug message arguments */
+#define FCELS_ARGS( els )						\
+	(els)->port->name,						\
+	( (els)->handler ? (els)->handler->name : "unknown ELS" ),	\
+	( fc_els_is_request ( els ) ? "to" : "from" ),			\
+	fc_id_ntoa ( &(els)->peer_port_id )
+
+struct fc_els_handler fc_els_unknown_handler __fc_els_handler;
+
+/**
+ * Free Fibre Channel ELS transaction
+ *
+ * @v refcnt		Reference count
+ */
+static void fc_els_free ( struct refcnt *refcnt ) {
+	struct fc_els *els = container_of ( refcnt, struct fc_els, refcnt );
+
+	assert ( ! process_running ( &els->process ) );
+	fc_port_put ( els->port );
+	free ( els );
+}
+
+/**
+ * Close Fibre Channel ELS transaction
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v rc		Reason for close
+ */
+static void fc_els_close ( struct fc_els *els, int rc ) {
+
+	if ( rc != 0 ) {
+		DBGC ( els, FCELS_FMT " complete (%s)\n",
+		       FCELS_ARGS ( els ), strerror ( rc ) );
+	}
+
+	/* Stop process */
+	process_del ( &els->process );
+
+	/* Shut down interfaces */
+	intf_shutdown ( &els->xchg, rc );
+	intf_shutdown ( &els->job, rc );
+}
+
+/**
+ * Detect Fibre Channel ELS frame handler
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v command		ELS command code
+ * @ret handler		ELS handler, or NULL
+ */
+static struct fc_els_handler * fc_els_detect ( struct fc_els *els,
+					       const void *data,
+					       size_t len ) {
+	const struct fc_els_frame_common *frame = data;
+	struct fc_els_handler *handler;
+	int rc;
+
+	/* Sanity check */
+	if ( len < sizeof ( *frame ) )
+		return NULL;
+
+	/* Try each handler in turn */
+	for_each_table_entry ( handler, FC_ELS_HANDLERS ) {
+		if ( ( rc = handler->detect ( els, data, len ) ) == 0 )
+			return handler;
+	}
+
+	return NULL;
+}
+
+/**
+ * Transmit Fibre Channel ELS frame
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v data		Data to transmit
+ * @v len		Length of data
+ * @ret rc		Return status code
+ */
+int fc_els_tx ( struct fc_els *els, const void *data, size_t len ) {
+	struct xfer_metadata meta = {
+		.flags = ( fc_els_is_request ( els ) ?
+			   XFER_FL_OVER : ( XFER_FL_RESPONSE | XFER_FL_OUT ) ),
+	};
+	int rc;
+
+	DBGC2 ( els, FCELS_FMT " transmitting:\n", FCELS_ARGS ( els ) );
+	DBGC2_HDA ( els, 0, data, len );
+
+	/* Transmit frame */
+	if ( ( rc = xfer_deliver_raw_meta ( &els->xchg, data, len,
+					    &meta ) ) != 0 ) {
+		DBGC ( els, FCELS_FMT " could not deliver frame: %s\n",
+		       FCELS_ARGS ( els ), strerror ( rc ) );
+		return rc;
+	}
+
+	return 0;
+}
+
+/**
+ * Receive Fibre Channel ELS frame
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v iobuf		I/O buffer
+ * @v meta		Data transfer metadata
+ * @ret rc		Return status code
+ */
+static int fc_els_rx ( struct fc_els *els,
+		       struct io_buffer *iobuf,
+		       struct xfer_metadata *meta __unused ) {
+	struct fc_els_frame_common *frame = iobuf->data;
+	size_t len = iob_len ( iobuf );
+	int ( * rx ) ( struct fc_els *els, const void *data, size_t len );
+	int rc;
+
+	/* Sanity check */
+	if ( len < sizeof ( *frame ) ) {
+		DBGC ( els, FCELS_FMT " received underlength frame:\n",
+		       FCELS_ARGS ( els ) );
+		DBGC_HDA ( els, 0, frame, len );
+		rc = -EINVAL;
+		goto done;
+	}
+
+	/* Check for rejection responses */
+	if ( fc_els_is_request ( els ) &&
+	     ( frame->command != FC_ELS_LS_ACC ) ) {
+		DBGC ( els, FCELS_FMT " rejected:\n", FCELS_ARGS ( els ) );
+		DBGC_HDA ( els, 0, frame, len );
+		rc = -EACCES;
+		goto done;
+	}
+
+	/* Determine handler, if necessary */
+	if ( ! els->handler )
+		els->handler = fc_els_detect ( els, frame, len );
+	if ( ! els->handler )
+		els->handler = &fc_els_unknown_handler;
+
+	DBGC2 ( els, FCELS_FMT " received:\n", FCELS_ARGS ( els ) );
+	DBGC2_HDA ( els, 0, frame, len );
+
+	/* Handle received frame */
+	rx = ( fc_els_is_request ( els ) ?
+	       els->handler->rx_response : els->handler->rx_request );
+	if ( ( rc = rx ( els, frame, len ) ) != 0 ) {
+		DBGC ( els, FCELS_FMT " could not handle received frame: "
+		       "%s\n", FCELS_ARGS ( els ), strerror ( rc ) );
+		DBGC_HDA ( els, 0, frame, len );
+		goto done;
+	}
+
+	/* Free I/O buffer.  Do this before transmitting response to
+	 * minimise memory consumption.
+	 */
+	free_iob ( iob_disown ( iobuf ) );
+
+	/* Transmit response if applicable */
+	if ( ( ! fc_els_is_request ( els ) ) &&
+	     ( ( rc = els->handler->tx_response ( els ) ) != 0 ) ) {
+		DBGC ( els, FCELS_FMT " could not transmit response: %s\n",
+		       FCELS_ARGS ( els ), strerror ( rc ) );
+		goto done;
+	}
+
+ done:
+	/* Free I/O buffer */
+	free_iob ( iobuf );
+
+	/* Close transaction */
+	fc_els_close ( els, rc );
+
+	return rc;
+}
+
+/** Fibre Channel ELS exchange interface operations */
+static struct interface_operation fc_els_xchg_op[] = {
+	INTF_OP ( xfer_deliver, struct fc_els *, fc_els_rx ),
+	INTF_OP ( intf_close, struct fc_els *, fc_els_close ),
+};
+
+/** Fibre Channel ELS exchange interface descriptor */
+static struct interface_descriptor fc_els_xchg_desc =
+	INTF_DESC ( struct fc_els, xchg, fc_els_xchg_op );
+
+/** Fibre Channel ELS job control interface operations */
+static struct interface_operation fc_els_job_op[] = {
+	INTF_OP ( intf_close, struct fc_els *, fc_els_close ),
+};
+
+/** Fibre Channel ELS job control interface descriptor */
+static struct interface_descriptor fc_els_job_desc =
+	INTF_DESC ( struct fc_els, job, fc_els_job_op );
+
+/**
+ * Fibre Channel ELS process
+ *
+ * @v process		Process
+ */
+static void fc_els_step ( struct process *process ) {
+	struct fc_els *els =
+		container_of ( process, struct fc_els, process );
+	int rc;
+
+	/* Sanity check */
+	assert ( fc_els_is_request ( els ) );
+
+	/* Stop process */
+	process_del ( &els->process );
+
+	/* Create exchange */
+	if ( ( rc = fc_xchg_originate ( &els->xchg, els->port,
+					&els->peer_port_id,
+					FC_TYPE_ELS ) ) != 0 ) {
+		DBGC ( els, FCELS_FMT " could not create exchange: %s\n",
+		       FCELS_ARGS ( els ), strerror ( rc ) );
+		fc_els_close ( els, rc );
+		return;
+	}
+
+	/* Transmit request */
+	if ( ( rc = els->handler->tx_request ( els ) ) != 0 ) {
+		DBGC ( els, FCELS_FMT " could not transmit request: %s\n",
+		       FCELS_ARGS ( els ), strerror ( rc ) );
+		fc_els_close ( els, rc );
+		return;
+	}
+}
+
+/**
+ * Create ELS transaction
+ *
+ * @v port		Fibre Channel port
+ * @v port_id		Local port ID
+ * @v peer_port_id	Peer port ID
+ * @ret els		Fibre Channel ELS transaction, or NULL
+ */
+static struct fc_els * fc_els_create ( struct fc_port *port,
+				       struct fc_port_id *port_id,
+				       struct fc_port_id *peer_port_id ) {
+	struct fc_els *els;
+
+	/* Allocate and initialise structure */
+	els = zalloc ( sizeof ( *els ) );
+	if ( ! els )
+		return NULL;
+	ref_init ( &els->refcnt, fc_els_free );
+	intf_init ( &els->job, &fc_els_job_desc, &els->refcnt );
+	intf_init ( &els->xchg, &fc_els_xchg_desc, &els->refcnt );
+	process_init_stopped ( &els->process, fc_els_step, &els->refcnt );
+	els->port = fc_port_get ( port );
+	memcpy ( &els->port_id, port_id, sizeof ( els->port_id ) );
+	memcpy ( &els->peer_port_id, peer_port_id,
+		 sizeof ( els->peer_port_id ) );
+	return els;
+}
+
+/**
+ * Create ELS request
+ *
+ * @v job		Parent job-control interface
+ * @v port		Fibre Channel port
+ * @v peer_port_id	Peer port ID
+ * @v handler		ELS handler
+ * @ret rc		Return status code
+ */
+int fc_els_request ( struct interface *job, struct fc_port *port,
+		     struct fc_port_id *peer_port_id,
+		     struct fc_els_handler *handler ) {
+	struct fc_els *els;
+
+	/* Allocate and initialise structure */
+	els = fc_els_create ( port, &port->port_id, peer_port_id );
+	if ( ! els )
+		return -ENOMEM;
+	els->handler = handler;
+	els->flags = FC_ELS_REQUEST;
+	process_add ( &els->process );
+
+	/* Attach to parent job interface, mortalise self, and return */
+	intf_plug_plug ( &els->job, job );
+	ref_put ( &els->refcnt );
+	return 0;
+}
+
+/**
+ * Create ELS response
+ *
+ * @v xchg		Exchange interface
+ * @v port		Fibre Channel port
+ * @v port_id		Local port ID
+ * @v peer_port_id	Peer port ID
+ * @ret rc		Return status code
+ */
+static int fc_els_respond ( struct interface *xchg, struct fc_port *port,
+			    struct fc_port_id *port_id,
+			    struct fc_port_id *peer_port_id ) {
+	struct fc_els *els;
+
+	/* Allocate and initialise structure */
+	els = fc_els_create ( port, port_id, peer_port_id );
+	if ( ! els )
+		return -ENOMEM;
+
+	/* Attach to exchange interface, mortalise self, and return */
+	intf_plug_plug ( &els->xchg, xchg );
+	ref_put ( &els->refcnt );
+	return 0;
+}
+
+/** Fibre Channel ELS responder */
+struct fc_responder fc_els_responder __fc_responder = {
+	.type = FC_TYPE_ELS,
+	.respond = fc_els_respond,
+};
+
+/******************************************************************************
+ *
+ * Unknown ELS handler
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Transmit unknown ELS request
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @ret rc		Return status code
+ */
+static int fc_els_unknown_tx_request ( struct fc_els *els __unused ) {
+	return -ENOTSUP;
+}
+
+/**
+ * Transmit unknown ELS response
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @ret rc		Return status code
+ */
+static int fc_els_unknown_tx_response ( struct fc_els *els ) {
+	struct fc_ls_rjt_frame ls_rjt;
+
+	/* Construct LS_RJT */
+	memset ( &ls_rjt, 0, sizeof ( ls_rjt ) );
+	ls_rjt.command = FC_ELS_LS_RJT;
+	ls_rjt.reason = FC_ELS_RJT_UNSUPPORTED;
+
+	/* Transmit LS_RJT */
+	return fc_els_tx ( els, &ls_rjt, sizeof ( ls_rjt ) );
+}
+
+/**
+ * Receive unknown ELS request
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v data		ELS frame
+ * @v len		Length of ELS frame
+ * @ret rc		Return status code
+ */
+static int fc_els_unknown_rx_request ( struct fc_els *els, const void *data,
+				       size_t len ) {
+
+	DBGC ( els, FCELS_FMT ":\n", FCELS_ARGS ( els ) );
+	DBGC_HDA ( els, 0, data, len );
+	return 0;
+}
+
+/**
+ * Receive unknown ELS response
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v data		ELS frame
+ * @v len		Length of ELS frame
+ * @ret rc		Return status code
+ */
+static int fc_els_unknown_rx_response ( struct fc_els *els __unused,
+					const void *data __unused,
+					size_t len __unused ) {
+	assert ( 0 );
+	return -EINVAL;
+}
+
+/**
+ * Detect unknown ELS
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v data		ELS frame
+ * @v len		Length of ELS frame
+ * @ret rc		Return status code
+ */
+static int fc_els_unknown_detect ( struct fc_els *els __unused,
+				   const void *data __unused,
+				   size_t len __unused ) {
+	return -ENOTSUP;
+}
+
+/** Unknown ELS handler */
+struct fc_els_handler fc_els_unknown_handler __fc_els_handler = {
+	.name		= "UNKNOWN",
+	.tx_request	= fc_els_unknown_tx_request,
+	.tx_response	= fc_els_unknown_tx_response,
+	.rx_request	= fc_els_unknown_rx_request,
+	.rx_response	= fc_els_unknown_rx_response,
+	.detect		= fc_els_unknown_detect,
+};
+
+/******************************************************************************
+ *
+ * FLOGI
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Transmit FLOGI
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @ret rc		Return status code
+ */
+static int fc_els_flogi_tx ( struct fc_els *els ) {
+	struct fc_login_frame flogi;
+
+	/* Construct FLOGI */
+	memset ( &flogi, 0, sizeof ( flogi ) );
+	flogi.command = fc_els_tx_command ( els, FC_ELS_FLOGI );
+	flogi.common.version = htons ( FC_LOGIN_VERSION );
+	flogi.common.credit = htons ( FC_LOGIN_DEFAULT_B2B );
+	flogi.common.flags = htons ( FC_LOGIN_CONTINUOUS_OFFSET );
+	flogi.common.mtu = htons ( FC_LOGIN_DEFAULT_MTU );
+	memcpy ( &flogi.port_wwn, &els->port->port_wwn,
+		 sizeof ( flogi.port_wwn ) );
+	memcpy ( &flogi.node_wwn, &els->port->node_wwn,
+		 sizeof ( flogi.node_wwn ) );
+	flogi.class3.flags = htons ( FC_LOGIN_CLASS_VALID |
+				     FC_LOGIN_CLASS_SEQUENTIAL );
+
+	/* Transmit FLOGI */
+	return fc_els_tx ( els, &flogi, sizeof ( flogi ) );
+}
+
+/**
+ * Receive FLOGI
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v data		ELS frame
+ * @v len		Length of ELS frame
+ * @ret rc		Return status code
+ */
+static int fc_els_flogi_rx ( struct fc_els *els, const void *data,
+			     size_t len ) {
+	const struct fc_login_frame *flogi = data;
+	int has_fabric;
+	int rc;
+
+	/* Sanity check */
+	if ( len < sizeof ( *flogi ) ) {
+		DBGC ( els, FCELS_FMT " received underlength frame:\n",
+		       FCELS_ARGS ( els ) );
+		DBGC_HDA ( els, 0, data, len );
+		return -EINVAL;
+	}
+
+	/* Extract parameters */
+	has_fabric = ( flogi->common.flags & htons ( FC_LOGIN_F_PORT ) );
+	DBGC ( els, FCELS_FMT " has node %s\n", FCELS_ARGS ( els ),
+	       fc_ntoa ( &flogi->node_wwn ) );
+	DBGC ( els, FCELS_FMT " has port %s\n", FCELS_ARGS ( els ),
+	       fc_ntoa ( &flogi->port_wwn ) );
+	if ( has_fabric ) {
+		DBGC ( els, FCELS_FMT " has fabric with local ID %s\n",
+		       FCELS_ARGS ( els ), fc_id_ntoa ( &els->port_id ) );
+	} else {
+		DBGC ( els, FCELS_FMT " has point-to-point link\n",
+		       FCELS_ARGS ( els ) );
+	}
+
+	/* Log in port */
+	if ( ( rc = fc_port_login ( els->port, &els->port_id, &flogi->node_wwn,
+				    &flogi->port_wwn, has_fabric ) ) != 0 ) {
+		DBGC ( els, FCELS_FMT " could not log in port: %s\n",
+		       FCELS_ARGS ( els ), strerror ( rc ) );
+		return rc;
+	}
+
+	return 0;
+}
+
+/**
+ * Detect FLOGI
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v data		ELS frame
+ * @v len		Length of ELS frame
+ * @ret rc		Return status code
+ */
+static int fc_els_flogi_detect ( struct fc_els *els __unused, const void *data,
+				 size_t len __unused ) {
+	const struct fc_login_frame *flogi = data;
+
+	/* Check for FLOGI */
+	if ( flogi->command != FC_ELS_FLOGI )
+		return -EINVAL;
+
+	return 0;
+}
+
+/** FLOGI ELS handler */
+struct fc_els_handler fc_els_flogi_handler __fc_els_handler = {
+	.name		= "FLOGI",
+	.tx_request	= fc_els_flogi_tx,
+	.tx_response	= fc_els_flogi_tx,
+	.rx_request	= fc_els_flogi_rx,
+	.rx_response	= fc_els_flogi_rx,
+	.detect		= fc_els_flogi_detect,
+};
+
+/**
+ * Create FLOGI request
+ *
+ * @v parent		Parent interface
+ * @v port		Fibre Channel port
+ * @ret rc		Return status code
+ */
+int fc_els_flogi ( struct interface *parent, struct fc_port *port ) {
+
+	return fc_els_request ( parent, port, &fc_f_port_id,
+				&fc_els_flogi_handler );
+}
+
+/******************************************************************************
+ *
+ * PLOGI
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Transmit PLOGI
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @ret rc		Return status code
+ */
+static int fc_els_plogi_tx ( struct fc_els *els ) {
+	struct fc_login_frame plogi;
+
+	/* Construct PLOGI */
+	memset ( &plogi, 0, sizeof ( plogi ) );
+	plogi.command = fc_els_tx_command ( els, FC_ELS_PLOGI );
+	plogi.common.version = htons ( FC_LOGIN_VERSION );
+	plogi.common.credit = htons ( FC_LOGIN_DEFAULT_B2B );
+	plogi.common.flags = htons ( FC_LOGIN_CONTINUOUS_OFFSET );
+	plogi.common.mtu = htons ( FC_LOGIN_DEFAULT_MTU );
+	plogi.common.u.plogi.max_seq = htons ( FC_LOGIN_DEFAULT_MAX_SEQ );
+	plogi.common.u.plogi.rel_offs = htons ( FC_LOGIN_DEFAULT_REL_OFFS );
+	plogi.common.e_d_tov = htonl ( FC_LOGIN_DEFAULT_E_D_TOV );
+	memcpy ( &plogi.port_wwn, &els->port->port_wwn,
+		 sizeof ( plogi.port_wwn ) );
+	memcpy ( &plogi.node_wwn, &els->port->node_wwn,
+		 sizeof ( plogi.node_wwn ) );
+	plogi.class3.flags = htons ( FC_LOGIN_CLASS_VALID |
+				     FC_LOGIN_CLASS_SEQUENTIAL );
+	plogi.class3.mtu = htons ( FC_LOGIN_DEFAULT_MTU );
+	plogi.class3.max_seq = htons ( FC_LOGIN_DEFAULT_MAX_SEQ );
+	plogi.class3.max_seq_per_xchg = 1;
+
+	/* Transmit PLOGI */
+	return fc_els_tx ( els, &plogi, sizeof ( plogi ) );
+}
+
+/**
+ * Receive PLOGI
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v data		ELS frame
+ * @v len		Length of ELS frame
+ * @ret rc		Return status code
+ */
+static int fc_els_plogi_rx ( struct fc_els *els, const void *data,
+			     size_t len ) {
+	const struct fc_login_frame *plogi = data;
+	struct fc_peer *peer;
+	int rc;
+
+	/* Sanity checks */
+	if ( len < sizeof ( *plogi ) ) {
+		DBGC ( els, FCELS_FMT " received underlength frame:\n",
+		       FCELS_ARGS ( els ) );
+		DBGC_HDA ( els, 0, data, len );
+		rc = -EINVAL;
+		goto err_sanity;
+	}
+	if ( ! fc_link_ok ( &els->port->link ) ) {
+		DBGC ( els, FCELS_FMT " received while port link is down\n",
+		       FCELS_ARGS ( els ) );
+		rc = -EINVAL;
+		goto err_sanity;
+	}
+
+	/* Extract parameters */
+	DBGC ( els, FCELS_FMT " has node %s\n", FCELS_ARGS ( els ),
+	       fc_ntoa ( &plogi->node_wwn ) );
+	DBGC ( els, FCELS_FMT " has port %s as %s\n",
+	       FCELS_ARGS ( els ), fc_ntoa ( &plogi->port_wwn ),
+	       fc_id_ntoa ( &els->peer_port_id ) );
+
+	/* Get peer */
+	peer = fc_peer_get_wwn ( &plogi->node_wwn );
+	if ( ! peer ) {
+		DBGC ( els, FCELS_FMT " could not create peer\n",
+		       FCELS_ARGS ( els ) );
+		rc = -ENOMEM;
+		goto err_peer_get_wwn;
+	}
+
+	/* Record login */
+	if ( ( rc = fc_peer_login ( peer, els->port,
+				    &els->peer_port_id ) ) != 0 ) {
+		DBGC ( els, FCELS_FMT " could not log in peer: %s\n",
+		       FCELS_ARGS ( els ), strerror ( rc ) );
+		goto err_login;
+	}
+
+	/* Drop temporary reference to peer */
+	fc_peer_put ( peer );
+
+	return 0;
+
+ err_login:
+	fc_peer_put ( peer );
+ err_peer_get_wwn:
+ err_sanity:
+	return rc;
+}
+
+/**
+ * Detect PLOGI
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v data		ELS frame
+ * @v len		Length of ELS frame
+ * @ret rc		Return status code
+ */
+static int fc_els_plogi_detect ( struct fc_els *els __unused, const void *data,
+				 size_t len __unused ) {
+	const struct fc_login_frame *plogi = data;
+
+	/* Check for PLOGI */
+	if ( plogi->command != FC_ELS_PLOGI )
+		return -EINVAL;
+
+	return 0;
+}
+
+/** PLOGI ELS handler */
+struct fc_els_handler fc_els_plogi_handler __fc_els_handler = {
+	.name		= "PLOGI",
+	.tx_request	= fc_els_plogi_tx,
+	.tx_response	= fc_els_plogi_tx,
+	.rx_request	= fc_els_plogi_rx,
+	.rx_response	= fc_els_plogi_rx,
+	.detect		= fc_els_plogi_detect,
+};
+
+/**
+ * Create PLOGI request
+ *
+ * @v parent		Parent interface
+ * @v port		Fibre Channel port
+ * @v peer_port_id	Peer port ID
+ * @ret rc		Return status code
+ */
+int fc_els_plogi ( struct interface *parent, struct fc_port *port,
+		   struct fc_port_id *peer_port_id ) {
+
+	return fc_els_request ( parent, port, peer_port_id,
+				&fc_els_plogi_handler );
+}
+
+/******************************************************************************
+ *
+ * LOGO
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Transmit LOGO request
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @ret rc		Return status code
+ */
+static int fc_els_logo_tx_request ( struct fc_els *els ) {
+	struct fc_logout_request_frame logo;
+
+	/* Construct LOGO */
+	memset ( &logo, 0, sizeof ( logo ) );
+	logo.command = FC_ELS_LOGO;
+	memcpy ( &logo.port_id, &els->port->port_id, sizeof ( logo.port_id ) );
+	memcpy ( &logo.port_wwn, &els->port->port_wwn,
+		 sizeof ( logo.port_wwn ) );
+
+	/* Transmit LOGO */
+	return fc_els_tx ( els, &logo, sizeof ( logo ) );
+}
+
+/**
+ * Transmit LOGO response
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @ret rc		Return status code
+ */
+static int fc_els_logo_tx_response ( struct fc_els *els ) {
+	struct fc_logout_response_frame logo;
+
+	/* Construct LOGO */
+	memset ( &logo, 0, sizeof ( logo ) );
+	logo.command = FC_ELS_LS_ACC;
+
+	/* Transmit LOGO */
+	return fc_els_tx ( els, &logo, sizeof ( logo ) );
+}
+
+/**
+ * Log out individual peer or whole port as applicable
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v port_id		Peer port ID
+ */
+static void fc_els_logo_logout ( struct fc_els *els,
+				 const struct fc_port_id *peer_port_id ) {
+	struct fc_peer *peer;
+
+	if ( ( memcmp ( peer_port_id, &fc_f_port_id,
+			sizeof ( *peer_port_id ) ) == 0 ) ||
+	     ( memcmp ( peer_port_id, &els->port->port_id,
+			sizeof ( *peer_port_id ) ) == 0 ) ) {
+		fc_port_logout ( els->port, 0 );
+	} else {
+		peer = fc_peer_get_port_id ( els->port, peer_port_id );
+		if ( peer ) {
+			fc_peer_logout ( peer, 0 );
+			fc_peer_put ( peer );
+		}
+	}
+}
+
+/**
+ * Receive LOGO request
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v data		ELS frame
+ * @v len		Length of ELS frame
+ * @ret rc		Return status code
+ */
+static int fc_els_logo_rx_request ( struct fc_els *els, const void *data,
+				    size_t len ) {
+	const struct fc_logout_request_frame *logo = data;
+
+	/* Sanity check */
+	if ( len < sizeof ( *logo ) ) {
+		DBGC ( els, FCELS_FMT " received underlength frame:\n",
+		       FCELS_ARGS ( els ) );
+		DBGC_HDA ( els, 0, data, len );
+		return -EINVAL;
+	}
+
+	DBGC ( els, FCELS_FMT " has port %s as %s\n", FCELS_ARGS ( els ),
+	       fc_ntoa ( &logo->port_wwn ), fc_id_ntoa ( &logo->port_id ) );
+
+	/* Log out individual peer or whole port as applicable */
+	fc_els_logo_logout ( els, &logo->port_id );
+
+	return 0;
+}
+
+/**
+ * Receive LOGO response
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v data		ELS frame
+ * @v len		Length of ELS frame
+ * @ret rc		Return status code
+ */
+static int fc_els_logo_rx_response ( struct fc_els *els,
+				     const void *data __unused,
+				     size_t len __unused ) {
+
+	/* Log out individual peer or whole port as applicable */
+	fc_els_logo_logout ( els, &els->port_id );
+
+	return 0;
+}
+
+/**
+ * Detect LOGO
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v data		ELS frame
+ * @v len		Length of ELS frame
+ * @ret rc		Return status code
+ */
+static int fc_els_logo_detect ( struct fc_els *els __unused, const void *data,
+				size_t len __unused ) {
+	const struct fc_logout_request_frame *logo = data;
+
+	/* Check for LOGO */
+	if ( logo->command != FC_ELS_LOGO )
+		return -EINVAL;
+
+	return 0;
+}
+
+/** LOGO ELS handler */
+struct fc_els_handler fc_els_logo_handler __fc_els_handler = {
+	.name		= "LOGO",
+	.tx_request	= fc_els_logo_tx_request,
+	.tx_response	= fc_els_logo_tx_response,
+	.rx_request	= fc_els_logo_rx_request,
+	.rx_response	= fc_els_logo_rx_response,
+	.detect		= fc_els_logo_detect,
+};
+
+/**
+ * Create LOGO request
+ *
+ * @v parent		Parent interface
+ * @v port		Fibre Channel port
+ * @v peer_port_id	Peer port ID
+ * @ret rc		Return status code
+ */
+int fc_els_logo ( struct interface *parent, struct fc_port *port,
+		  struct fc_port_id *peer_port_id ) {
+
+	return fc_els_request ( parent, port, peer_port_id,
+				&fc_els_logo_handler );
+}
+
+/******************************************************************************
+ *
+ * PRLI
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Find PRLI descriptor
+ *
+ * @v type		Upper-layer protocol type
+ * @ret descriptor	PRLI descriptor, or NULL
+ */
+static struct fc_els_prli_descriptor *
+fc_els_prli_descriptor ( unsigned int type ) {
+	struct fc_els_prli_descriptor *descriptor;
+
+	for_each_table_entry ( descriptor, FC_ELS_PRLI_DESCRIPTORS ) {
+		if ( descriptor->type == type )
+			return descriptor;
+	}
+	return NULL;
+}
+
+/**
+ * Transmit PRLI
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v descriptor	ELS PRLI descriptor
+ * @v param		Service parameters
+ * @ret rc		Return status code
+ */
+int fc_els_prli_tx ( struct fc_els *els,
+		     struct fc_els_prli_descriptor *descriptor, void *param ) {
+	struct {
+		struct fc_prli_frame frame;
+		uint8_t param[descriptor->param_len];
+	} __attribute__ (( packed )) prli;
+	struct fc_ulp *ulp;
+	int rc;
+
+	/* Get ULP */
+	ulp = fc_ulp_get_port_id_type ( els->port, &els->peer_port_id,
+					descriptor->type );
+	if ( ! ulp ) {
+		rc = -ENOMEM;
+		goto err_get_port_id_type;
+	}
+
+	/* Build frame for transmission */
+	memset ( &prli, 0, sizeof ( prli ) );
+	prli.frame.command = fc_els_tx_command ( els, FC_ELS_PRLI );
+	prli.frame.page_len =
+		( sizeof ( prli.frame.page ) + sizeof ( prli.param ) );
+	prli.frame.len = htons ( sizeof ( prli ) );
+	prli.frame.page.type = descriptor->type;
+	if ( fc_els_is_request ( els ) ) {
+		prli.frame.page.flags |= htons ( FC_PRLI_ESTABLISH );
+	} else if ( fc_link_ok ( &ulp->link ) ) {
+		prli.frame.page.flags |= htons ( FC_PRLI_ESTABLISH |
+						    FC_PRLI_RESPONSE_SUCCESS );
+	}
+	memcpy ( &prli.param, param, sizeof ( prli.param ) );
+
+	/* Transmit frame */
+	if ( ( rc = fc_els_tx ( els, &prli, sizeof ( prli ) ) ) != 0 )
+		goto err_tx;
+
+	/* Drop temporary reference to ULP */
+	fc_ulp_put ( ulp );
+
+	return 0;
+
+ err_tx:
+	fc_ulp_put ( ulp );
+ err_get_port_id_type:
+	return rc;
+}
+
+/**
+ * Receive PRLI
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v descriptor	ELS PRLI descriptor
+ * @v frame		ELS frame
+ * @v len		Length of ELS frame
+ * @ret rc		Return status code
+ */
+int fc_els_prli_rx ( struct fc_els *els,
+		     struct fc_els_prli_descriptor *descriptor,
+		     const void *data, size_t len ) {
+	const struct {
+		struct fc_prli_frame frame;
+		uint8_t param[descriptor->param_len];
+	} __attribute__ (( packed )) *prli = data;
+	struct fc_ulp *ulp;
+	int rc;
+
+	/* Sanity check */
+	if ( len < sizeof ( *prli ) ) {
+		DBGC ( els, FCELS_FMT " received underlength frame:\n",
+		       FCELS_ARGS ( els ) );
+		DBGC_HDA ( els, 0, data, len );
+		rc = -EINVAL;
+		goto err_sanity;
+	}
+
+	DBGC ( els, FCELS_FMT " has parameters:\n", FCELS_ARGS ( els ) );
+	DBGC_HDA ( els, 0, prli->param, sizeof ( prli->param ) );
+
+	/* Get ULP */
+	ulp = fc_ulp_get_port_id_type ( els->port, &els->peer_port_id,
+					descriptor->type );
+	if ( ! ulp ) {
+		rc = -ENOMEM;
+		goto err_get_port_id_type;
+	}
+
+	/* Sanity check */
+	if ( ! fc_link_ok ( &ulp->peer->link ) ) {
+		DBGC ( els, FCELS_FMT " received while peer link is down\n",
+		       FCELS_ARGS ( els ) );
+		rc = -EINVAL;
+		goto err_link;
+	}
+
+	/* Log in ULP, if applicable */
+	if ( prli->frame.page.flags & htons ( FC_PRLI_ESTABLISH ) ) {
+		if ( ( rc = fc_ulp_login ( ulp, prli->param,
+					   sizeof ( prli->param ),
+					   fc_els_is_request ( els ) ) ) != 0 ){
+			DBGC ( els, FCELS_FMT " could not log in ULP: %s\n",
+			       FCELS_ARGS ( els ), strerror ( rc ) );
+			goto err_login;
+		}
+	} else {
+		if ( fc_els_is_request ( els ) ) {
+			fc_ulp_logout ( ulp, -EACCES );
+		} else {
+			/* This is just an information-gathering PRLI; do not
+			 * log in or out
+			 */
+		}
+	}
+
+	/* Drop temporary reference to ULP */
+	fc_ulp_put ( ulp );
+
+	return 0;
+
+ err_login:
+ err_link:
+	fc_ulp_put ( ulp );
+ err_get_port_id_type:
+ err_sanity:
+	return rc;
+}
+
+/**
+ * Detect PRLI
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v descriptor	ELS PRLI descriptor
+ * @v data		ELS frame
+ * @v len		Length of ELS frame
+ * @ret rc		Return status code
+ */
+int fc_els_prli_detect ( struct fc_els *els __unused,
+			 struct fc_els_prli_descriptor *descriptor,
+			 const void *data, size_t len ) {
+	const struct {
+		struct fc_prli_frame frame;
+		uint8_t param[descriptor->param_len];
+	} __attribute__ (( packed )) *prli = data;
+
+	/* Check for PRLI */
+	if ( prli->frame.command != FC_ELS_PRLI )
+		return -EINVAL;
+
+	/* Check for sufficient length to contain service parameter page */
+	if ( len < sizeof ( *prli ) )
+		return -EINVAL;
+
+	/* Check for upper-layer protocol type */
+	if ( prli->frame.page.type != descriptor->type )
+		return -EINVAL;
+
+	return 0;
+}
+
+/**
+ * Create PRLI request
+ *
+ * @v parent		Parent interface
+ * @v port		Fibre Channel port
+ * @v peer_port_id	Peer port ID
+ * @v type		Upper-layer protocol type
+ * @ret rc		Return status code
+ */
+int fc_els_prli ( struct interface *parent, struct fc_port *port,
+		  struct fc_port_id *peer_port_id, unsigned int type ) {
+	struct fc_els_prli_descriptor *descriptor;
+
+	/* Find a PRLI descriptor */
+	descriptor = fc_els_prli_descriptor ( type );
+	if ( ! descriptor )
+		return -ENOTSUP;
+
+	return fc_els_request ( parent, port, peer_port_id,
+				descriptor->handler );
+}
+
+/******************************************************************************
+ *
+ * RTV
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Transmit RTV response
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @ret rc		Return status code
+ */
+static int fc_els_rtv_tx_response ( struct fc_els *els ) {
+	struct fc_rtv_response_frame rtv;
+
+	/* Construct RTV */
+	memset ( &rtv, 0, sizeof ( rtv ) );
+	rtv.command = FC_ELS_LS_ACC;
+	rtv.e_d_tov = htonl ( FC_LOGIN_DEFAULT_E_D_TOV );
+
+	/* Transmit RTV */
+	return fc_els_tx ( els, &rtv, sizeof ( rtv ) );
+}
+
+/**
+ * Receive RTV request
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v data		ELS frame
+ * @v len		Length of ELS frame
+ * @ret rc		Return status code
+ */
+static int fc_els_rtv_rx_request ( struct fc_els *els,
+				   const void *data __unused,
+				   size_t len __unused ) {
+
+	DBGC ( els, FCELS_FMT "\n", FCELS_ARGS ( els ) );
+
+	/* Nothing to do */
+	return 0;
+}
+
+/**
+ * Detect RTV
+ *
+ * @v els		Fibre Channel ELS transaction
+ * @v data		ELS frame
+ * @v len		Length of ELS frame
+ * @ret rc		Return status code
+ */
+static int fc_els_rtv_detect ( struct fc_els *els __unused, const void *data,
+			       size_t len __unused ) {
+	const struct fc_rtv_request_frame *rtv = data;
+
+	/* Check for RTV */
+	if ( rtv->command != FC_ELS_RTV )
+		return -EINVAL;
+
+	return 0;
+}
+
+/** RTV ELS handler */
+struct fc_els_handler fc_els_rtv_handler __fc_els_handler = {
+	.name		= "RTV",
+	.tx_request	= fc_els_unknown_tx_request,
+	.tx_response	= fc_els_rtv_tx_response,
+	.rx_request	= fc_els_rtv_rx_request,
+	.rx_response	= fc_els_unknown_rx_response,
+	.detect		= fc_els_rtv_detect,
+};