drivers/s390/scsi/zfcp_fc.c - fp2-dev/kernel/msm - Gitiles

 /*
  * zfcp device driver
  *
  * Fibre Channel related functions for the zfcp device driver.
  *
  * Copyright IBM Corporation 2008
  */

 #include "zfcp_ext.h"

 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
 				   struct fcp_rscn_element *elem)
 {
 	unsigned long flags;
 	struct zfcp_port *port;

 	read_lock_irqsave(&zfcp_data.config_lock, flags);
 	list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) {
 		if (atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
 			continue;
 		/* FIXME: ZFCP_STATUS_PORT_DID_DID check is racy */
 		if (!atomic_test_mask(ZFCP_STATUS_PORT_DID_DID, &port->status))
 			/* Try to connect to unused ports anyway. */
 			zfcp_erp_port_reopen(port,
 					     ZFCP_STATUS_COMMON_ERP_FAILED,
 					     82, fsf_req);
 		else if ((port->d_id & range) == (elem->nport_did & range))
 			/* Check connection status for connected ports */
 			zfcp_test_link(port);
 	}
 	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 }

 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
 {
 	struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
 	struct fcp_rscn_head *fcp_rscn_head;
 	struct fcp_rscn_element *fcp_rscn_element;
 	u16 i;
 	u16 no_entries;
 	u32 range_mask;

 	fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
 	fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;

 	/* see FC-FS */
 	no_entries = fcp_rscn_head->payload_len /
 			sizeof(struct fcp_rscn_element);

 	for (i = 1; i < no_entries; i++) {
 		/* skip head and start with 1st element */
 		fcp_rscn_element++;
 		switch (fcp_rscn_element->addr_format) {
 		case ZFCP_PORT_ADDRESS:
 			range_mask = ZFCP_PORTS_RANGE_PORT;
 			break;
 		case ZFCP_AREA_ADDRESS:
 			range_mask = ZFCP_PORTS_RANGE_AREA;
 			break;
 		case ZFCP_DOMAIN_ADDRESS:
 			range_mask = ZFCP_PORTS_RANGE_DOMAIN;
 			break;
 		case ZFCP_FABRIC_ADDRESS:
 			range_mask = ZFCP_PORTS_RANGE_FABRIC;
 			break;
 		default:
 			continue;
 		}
 		_zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
 	}
 }

 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, wwn_t wwpn)
 {
 	struct zfcp_adapter *adapter = req->adapter;
 	struct zfcp_port *port;
 	unsigned long flags;

 	read_lock_irqsave(&zfcp_data.config_lock, flags);
 	list_for_each_entry(port, &adapter->port_list_head, list)
 		if (port->wwpn == wwpn)
 			break;
 	read_unlock_irqrestore(&zfcp_data.config_lock, flags);

 	if (port && (port->wwpn == wwpn))
 		zfcp_erp_port_forced_reopen(port, 0, 83, req);
 }

 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 {
 	struct fsf_status_read_buffer *status_buffer =
 		(struct fsf_status_read_buffer *)req->data;
 	struct fsf_plogi *els_plogi =
 		(struct fsf_plogi *) status_buffer->payload;

 	zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
 }

 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 {
 	struct fsf_status_read_buffer *status_buffer =
 		(struct fsf_status_read_buffer *)req->data;
 	struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;

 	zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
 }

 /**
  * zfcp_fc_incoming_els - handle incoming ELS
  * @fsf_req - request which contains incoming ELS
  */
 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 {
 	struct fsf_status_read_buffer *status_buffer =
 		(struct fsf_status_read_buffer *) fsf_req->data;
 	unsigned int els_type = status_buffer->payload[0];

 	zfcp_san_dbf_event_incoming_els(fsf_req);
 	if (els_type == LS_PLOGI)
 		zfcp_fc_incoming_plogi(fsf_req);
 	else if (els_type == LS_LOGO)
 		zfcp_fc_incoming_logo(fsf_req);
 	else if (els_type == LS_RSCN)
 		zfcp_fc_incoming_rscn(fsf_req);
 }

 static void zfcp_ns_gid_pn_handler(unsigned long data)
 {
 	struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data;
 	struct zfcp_send_ct *ct = &gid_pn->ct;
 	struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
 	struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
 	struct zfcp_port *port = gid_pn->port;

 	if (ct->status)
 		goto out;
 	if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT) {
 		atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
 		goto out;
 	}
 	/* paranoia */
 	if (ct_iu_req->wwpn != port->wwpn)
 		goto out;
 	/* looks like a valid d_id */
 	port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
 	atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
 out:
 	mempool_free(gid_pn, port->adapter->pool.data_gid_pn);
 }

 /**
  * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
  * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
  * return: -ENOMEM on error, 0 otherwise
  */
 int zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
 {
 	int ret;
 	struct zfcp_gid_pn_data *gid_pn;
 	struct zfcp_adapter *adapter = erp_action->adapter;

 	gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC);
 	if (!gid_pn)
 		return -ENOMEM;

 	memset(gid_pn, 0, sizeof(*gid_pn));

 	/* setup parameters for send generic command */
 	gid_pn->port = erp_action->port;
 	gid_pn->ct.port = adapter->nameserver_port;
 	gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
 	gid_pn->ct.handler_data = (unsigned long) gid_pn;
 	gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
 	gid_pn->ct.req = &gid_pn->req;
 	gid_pn->ct.resp = &gid_pn->resp;
 	gid_pn->ct.req_count = 1;
 	gid_pn->ct.resp_count = 1;
 	sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
 		    sizeof(struct ct_iu_gid_pn_req));
 	sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
 		    sizeof(struct ct_iu_gid_pn_resp));

 	/* setup nameserver request */
 	gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
 	gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 	gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
 	gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
 	gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
 	gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_MAX_SIZE;
 	gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;

 	ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
 			       erp_action);
 	if (ret)
 		mempool_free(gid_pn, adapter->pool.data_gid_pn);
 	return ret;
 }

 /**
  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
  * @port: zfcp_port structure
  * @plogi: plogi payload
  *
  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
  */
 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
 {
 	port->maxframe_size = plogi->serv_param.common_serv_param[7] |
 		((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
 	if (plogi->serv_param.class1_serv_param[0] & 0x80)
 		port->supported_classes |= FC_COS_CLASS1;
 	if (plogi->serv_param.class2_serv_param[0] & 0x80)
 		port->supported_classes |= FC_COS_CLASS2;
 	if (plogi->serv_param.class3_serv_param[0] & 0x80)
 		port->supported_classes |= FC_COS_CLASS3;
 	if (plogi->serv_param.class4_serv_param[0] & 0x80)
 		port->supported_classes |= FC_COS_CLASS4;
 }

 struct zfcp_els_adisc {
 	struct zfcp_send_els els;
 	struct scatterlist req;
 	struct scatterlist resp;
 	struct zfcp_ls_adisc ls_adisc;
 	struct zfcp_ls_adisc_acc ls_adisc_acc;
 };

 static void zfcp_fc_adisc_handler(unsigned long data)
 {
 	struct zfcp_els_adisc *adisc = (struct zfcp_els_adisc *) data;
 	struct zfcp_port *port = adisc->els.port;
 	struct zfcp_ls_adisc_acc *ls_adisc = &adisc->ls_adisc_acc;

 	if (!adisc->els.status) {
 		/* request rejected or timed out */
 		zfcp_erp_port_forced_reopen(port, 0, 63, NULL);
 		goto out;
 	}

 	if (!port->wwnn)
 		port->wwnn = ls_adisc->wwnn;

 	if (port->wwpn != ls_adisc->wwpn)
 		zfcp_erp_port_reopen(port, 0, 64, NULL);

  out:
 	zfcp_port_put(port);
 	kfree(adisc);
 }

 static int zfcp_fc_adisc(struct zfcp_port *port)
 {
 	struct zfcp_els_adisc *adisc;
 	struct zfcp_adapter *adapter = port->adapter;

 	adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
 	if (!adisc)
 		return -ENOMEM;

 	adisc->els.req = &adisc->req;
 	adisc->els.resp = &adisc->resp;
 	sg_init_one(adisc->els.req, &adisc->ls_adisc,
 		    sizeof(struct zfcp_ls_adisc));
 	sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
 		    sizeof(struct zfcp_ls_adisc_acc));

 	adisc->els.req_count = 1;
 	adisc->els.resp_count = 1;
 	adisc->els.adapter = adapter;
 	adisc->els.port = port;
 	adisc->els.d_id = port->d_id;
 	adisc->els.handler = zfcp_fc_adisc_handler;
 	adisc->els.handler_data = (unsigned long) adisc;
 	adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;

 	/* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 	   without FC-AL-2 capability, so we don't set it */
 	adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
 	adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
 	adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);

 	return zfcp_fsf_send_els(&adisc->els);
 }

 /**
  * zfcp_test_link - lightweight link test procedure
  * @port: port to be tested
  *
  * Test status of a link to a remote port using the ELS command ADISC.
  * If there is a problem with the remote port, error recovery steps
  * will be triggered.
  */
 void zfcp_test_link(struct zfcp_port *port)
 {
 	int retval;

 	zfcp_port_get(port);
 	retval = zfcp_fc_adisc(port);
 	if (retval == 0 || retval == -EBUSY)
 		return;

 	/* send of ADISC was not possible */
 	zfcp_port_put(port);
 	zfcp_erp_port_forced_reopen(port, 0, 65, NULL);
 }
	/*
	* zfcp device driver
	*
	* Fibre Channel related functions for the zfcp device driver.
	*
	* Copyright IBM Corporation 2008
	*/

	#include "zfcp_ext.h"

	static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
	struct fcp_rscn_element *elem)
	{
	unsigned long flags;
	struct zfcp_port *port;

	read_lock_irqsave(&zfcp_data.config_lock, flags);
	list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) {
	if (atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
	continue;
	/* FIXME: ZFCP_STATUS_PORT_DID_DID check is racy */
	if (!atomic_test_mask(ZFCP_STATUS_PORT_DID_DID, &port->status))
	/* Try to connect to unused ports anyway. */
	zfcp_erp_port_reopen(port,
	ZFCP_STATUS_COMMON_ERP_FAILED,
	82, fsf_req);
	else if ((port->d_id & range) == (elem->nport_did & range))
	/* Check connection status for connected ports */
	zfcp_test_link(port);
	}
	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
	}

	static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
	{
	struct fsf_status_read_buffer status_buffer = (void )fsf_req->data;
	struct fcp_rscn_head *fcp_rscn_head;
	struct fcp_rscn_element *fcp_rscn_element;
	u16 i;
	u16 no_entries;
	u32 range_mask;

	fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
	fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;

	/* see FC-FS */
	no_entries = fcp_rscn_head->payload_len /
	sizeof(struct fcp_rscn_element);

	for (i = 1; i < no_entries; i++) {
	/* skip head and start with 1st element */
	fcp_rscn_element++;
	switch (fcp_rscn_element->addr_format) {
	case ZFCP_PORT_ADDRESS:
	range_mask = ZFCP_PORTS_RANGE_PORT;
	break;
	case ZFCP_AREA_ADDRESS:
	range_mask = ZFCP_PORTS_RANGE_AREA;
	break;
	case ZFCP_DOMAIN_ADDRESS:
	range_mask = ZFCP_PORTS_RANGE_DOMAIN;
	break;
	case ZFCP_FABRIC_ADDRESS:
	range_mask = ZFCP_PORTS_RANGE_FABRIC;
	break;
	default:
	continue;
	}
	_zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
	}
	}

	static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, wwn_t wwpn)
	{
	struct zfcp_adapter *adapter = req->adapter;
	struct zfcp_port *port;
	unsigned long flags;

	read_lock_irqsave(&zfcp_data.config_lock, flags);
	list_for_each_entry(port, &adapter->port_list_head, list)
	if (port->wwpn == wwpn)
	break;
	read_unlock_irqrestore(&zfcp_data.config_lock, flags);

	if (port && (port->wwpn == wwpn))
	zfcp_erp_port_forced_reopen(port, 0, 83, req);
	}

	static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
	{
	struct fsf_status_read_buffer *status_buffer =
	(struct fsf_status_read_buffer *)req->data;
	struct fsf_plogi *els_plogi =
	(struct fsf_plogi *) status_buffer->payload;

	zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
	}

	static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
	{
	struct fsf_status_read_buffer *status_buffer =
	(struct fsf_status_read_buffer *)req->data;
	struct fcp_logo els_logo = (struct fcp_logo ) status_buffer->payload;

	zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
	}

	/**
	* zfcp_fc_incoming_els - handle incoming ELS
	* @fsf_req - request which contains incoming ELS
	*/
	void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
	{
	struct fsf_status_read_buffer *status_buffer =
	(struct fsf_status_read_buffer *) fsf_req->data;
	unsigned int els_type = status_buffer->payload[0];

	zfcp_san_dbf_event_incoming_els(fsf_req);
	if (els_type == LS_PLOGI)
	zfcp_fc_incoming_plogi(fsf_req);
	else if (els_type == LS_LOGO)
	zfcp_fc_incoming_logo(fsf_req);
	else if (els_type == LS_RSCN)
	zfcp_fc_incoming_rscn(fsf_req);
	}

	static void zfcp_ns_gid_pn_handler(unsigned long data)
	{
	struct zfcp_gid_pn_data gid_pn = (struct zfcp_gid_pn_data ) data;
	struct zfcp_send_ct *ct = &gid_pn->ct;
	struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
	struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
	struct zfcp_port *port = gid_pn->port;

	if (ct->status)
	goto out;
	if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT) {
	atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
	goto out;
	}
	/* paranoia */
	if (ct_iu_req->wwpn != port->wwpn)
	goto out;
	/* looks like a valid d_id */
	port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
	atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
	out:
	mempool_free(gid_pn, port->adapter->pool.data_gid_pn);
	}

	/**
	* zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
	* @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
	* return: -ENOMEM on error, 0 otherwise
	*/
	int zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
	{
	int ret;
	struct zfcp_gid_pn_data *gid_pn;
	struct zfcp_adapter *adapter = erp_action->adapter;

	gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC);
	if (!gid_pn)
	return -ENOMEM;

	memset(gid_pn, 0, sizeof(*gid_pn));

	/* setup parameters for send generic command */
	gid_pn->port = erp_action->port;
	gid_pn->ct.port = adapter->nameserver_port;
	gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
	gid_pn->ct.handler_data = (unsigned long) gid_pn;
	gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
	gid_pn->ct.req = &gid_pn->req;
	gid_pn->ct.resp = &gid_pn->resp;
	gid_pn->ct.req_count = 1;
	gid_pn->ct.resp_count = 1;
	sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
	sizeof(struct ct_iu_gid_pn_req));
	sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
	sizeof(struct ct_iu_gid_pn_resp));

	/* setup nameserver request */
	gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
	gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
	gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
	gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
	gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
	gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_MAX_SIZE;
	gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;

	ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
	erp_action);
	if (ret)
	mempool_free(gid_pn, adapter->pool.data_gid_pn);
	return ret;
	}

	/**
	* zfcp_fc_plogi_evaluate - evaluate PLOGI playload
	* @port: zfcp_port structure
	* @plogi: plogi payload
	*
	* Evaluate PLOGI playload and copy important fields into zfcp_port structure
	*/
	void zfcp_fc_plogi_evaluate(struct zfcp_port port, struct fsf_plogi plogi)
	{
	port->maxframe_size = plogi->serv_param.common_serv_param[7] \|
	((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
	if (plogi->serv_param.class1_serv_param[0] & 0x80)
	port->supported_classes \|= FC_COS_CLASS1;
	if (plogi->serv_param.class2_serv_param[0] & 0x80)
	port->supported_classes \|= FC_COS_CLASS2;
	if (plogi->serv_param.class3_serv_param[0] & 0x80)
	port->supported_classes \|= FC_COS_CLASS3;
	if (plogi->serv_param.class4_serv_param[0] & 0x80)
	port->supported_classes \|= FC_COS_CLASS4;
	}

	struct zfcp_els_adisc {
	struct zfcp_send_els els;
	struct scatterlist req;
	struct scatterlist resp;
	struct zfcp_ls_adisc ls_adisc;
	struct zfcp_ls_adisc_acc ls_adisc_acc;
	};

	static void zfcp_fc_adisc_handler(unsigned long data)
	{
	struct zfcp_els_adisc adisc = (struct zfcp_els_adisc ) data;
	struct zfcp_port *port = adisc->els.port;
	struct zfcp_ls_adisc_acc *ls_adisc = &adisc->ls_adisc_acc;

	if (!adisc->els.status) {
	/* request rejected or timed out */
	zfcp_erp_port_forced_reopen(port, 0, 63, NULL);
	goto out;
	}

	if (!port->wwnn)
	port->wwnn = ls_adisc->wwnn;

	if (port->wwpn != ls_adisc->wwpn)
	zfcp_erp_port_reopen(port, 0, 64, NULL);

	out:
	zfcp_port_put(port);
	kfree(adisc);
	}

	static int zfcp_fc_adisc(struct zfcp_port *port)
	{
	struct zfcp_els_adisc *adisc;
	struct zfcp_adapter *adapter = port->adapter;

	adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
	if (!adisc)
	return -ENOMEM;

	adisc->els.req = &adisc->req;
	adisc->els.resp = &adisc->resp;
	sg_init_one(adisc->els.req, &adisc->ls_adisc,
	sizeof(struct zfcp_ls_adisc));
	sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
	sizeof(struct zfcp_ls_adisc_acc));

	adisc->els.req_count = 1;
	adisc->els.resp_count = 1;
	adisc->els.adapter = adapter;
	adisc->els.port = port;
	adisc->els.d_id = port->d_id;
	adisc->els.handler = zfcp_fc_adisc_handler;
	adisc->els.handler_data = (unsigned long) adisc;
	adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;

	/* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
	without FC-AL-2 capability, so we don't set it */
	adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
	adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
	adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);

	return zfcp_fsf_send_els(&adisc->els);
	}

	/**
	* zfcp_test_link - lightweight link test procedure
	* @port: port to be tested
	*
	* Test status of a link to a remote port using the ELS command ADISC.
	* If there is a problem with the remote port, error recovery steps
	* will be triggered.
	*/
	void zfcp_test_link(struct zfcp_port *port)
	{
	int retval;

	zfcp_port_get(port);
	retval = zfcp_fc_adisc(port);
	if (retval == 0 \|\| retval == -EBUSY)
	return;

	/* send of ADISC was not possible */
	zfcp_port_put(port);
	zfcp_erp_port_forced_reopen(port, 0, 65, NULL);
	}