[deliverable/linux.git] / drivers / s390 / scsi / zfcp_fc.c

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

#include "zfcp_ext.h"

struct ct_iu_gpn_ft_req {
	struct ct_hdr header;
	u8 flags;
	u8 domain_id_scope;
	u8 area_id_scope;
	u8 fc4_type;
} __attribute__ ((packed));

struct gpn_ft_resp_acc {
	u8 control;
	u8 port_id[3];
	u8 reserved[4];
	u64 wwpn;
} __attribute__ ((packed));

#define ZFCP_GPN_FT_ENTRIES ((PAGE_SIZE - sizeof(struct ct_hdr)) \
				/ sizeof(struct gpn_ft_resp_acc))
#define ZFCP_GPN_FT_BUFFERS 4
#define ZFCP_GPN_FT_MAX_ENTRIES ZFCP_GPN_FT_BUFFERS * (ZFCP_GPN_FT_ENTRIES + 1)

struct ct_iu_gpn_ft_resp {
	struct ct_hdr header;
	struct gpn_ft_resp_acc accept[ZFCP_GPN_FT_ENTRIES];
} __attribute__ ((packed));

struct zfcp_gpn_ft {
	struct zfcp_send_ct ct;
	struct scatterlist sg_req;
	struct scatterlist sg_resp[ZFCP_GPN_FT_BUFFERS];
};

struct zfcp_fc_ns_handler_data {
	struct completion done;
	void (*handler)(unsigned long);
	unsigned long handler_data;
};

static int zfcp_wka_port_get(struct zfcp_wka_port *wka_port)
{
	if (mutex_lock_interruptible(&wka_port->mutex))
		return -ERESTARTSYS;

	if (wka_port->status == ZFCP_WKA_PORT_OFFLINE ||
	    wka_port->status == ZFCP_WKA_PORT_CLOSING) {
		wka_port->status = ZFCP_WKA_PORT_OPENING;
		if (zfcp_fsf_open_wka_port(wka_port))
			wka_port->status = ZFCP_WKA_PORT_OFFLINE;
	}

	mutex_unlock(&wka_port->mutex);

	wait_event_timeout(
		wka_port->completion_wq,
		wka_port->status == ZFCP_WKA_PORT_ONLINE ||
		wka_port->status == ZFCP_WKA_PORT_OFFLINE,
		HZ >> 1);

	if (wka_port->status == ZFCP_WKA_PORT_ONLINE) {
		atomic_inc(&wka_port->refcount);
		return 0;
	}
	return -EIO;
}

static void zfcp_wka_port_offline(struct work_struct *work)
{
	struct delayed_work *dw = container_of(work, struct delayed_work, work);
	struct zfcp_wka_port *wka_port =
			container_of(dw, struct zfcp_wka_port, work);

	wait_event(wka_port->completion_wq,
			atomic_read(&wka_port->refcount) == 0);

	mutex_lock(&wka_port->mutex);
	if ((atomic_read(&wka_port->refcount) != 0) ||
	    (wka_port->status != ZFCP_WKA_PORT_ONLINE))
		goto out;

	wka_port->status = ZFCP_WKA_PORT_CLOSING;
	if (zfcp_fsf_close_wka_port(wka_port)) {
		wka_port->status = ZFCP_WKA_PORT_OFFLINE;
		wake_up(&wka_port->completion_wq);
	}
out:
	mutex_unlock(&wka_port->mutex);
}

static void zfcp_wka_port_put(struct zfcp_wka_port *wka_port)
{
	if (atomic_dec_return(&wka_port->refcount) != 0)
		return;
	/* wait 10 miliseconds, other reqs might pop in */
	schedule_delayed_work(&wka_port->work, HZ / 100);
}

void zfcp_fc_nameserver_init(struct zfcp_adapter *adapter)
{
	struct zfcp_wka_port *wka_port = &adapter->nsp;

	init_waitqueue_head(&wka_port->completion_wq);

	wka_port->adapter = adapter;
	wka_port->d_id = ZFCP_DID_DIRECTORY_SERVICE;

	wka_port->status = ZFCP_WKA_PORT_OFFLINE;
	atomic_set(&wka_port->refcount, 0);
	mutex_init(&wka_port->mutex);
	INIT_DELAYED_WORK(&wka_port->work, zfcp_wka_port_offline);
}

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_read(&port->status) & ZFCP_STATUS_PORT_PHYS_OPEN))
			/* 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.data;
	fcp_rscn_element = (struct fcp_rscn_element *) fcp_rscn_head;

	/* 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);
	}
	schedule_work(&fsf_req->adapter->scan_work);
}

static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 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.data;

	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.data;

	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.data[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_fc_ns_handler(unsigned long data)
{
	struct zfcp_fc_ns_handler_data *compl_rec =
			(struct zfcp_fc_ns_handler_data *) data;

	if (compl_rec->handler)
		compl_rec->handler(compl_rec->handler_data);

	complete(&compl_rec->done);
}

static void zfcp_fc_ns_gid_pn_eval(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)
		return;
	if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT) {
		atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
		return;
	}
	/* paranoia */
	if (ct_iu_req->wwpn != port->wwpn)
		return;
	/* 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);
}

int static zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action,
				     struct zfcp_gid_pn_data *gid_pn)
{
	struct zfcp_adapter *adapter = erp_action->adapter;
	struct zfcp_fc_ns_handler_data compl_rec;
	int ret;

	/* setup parameters for send generic command */
	gid_pn->port = erp_action->port;
	gid_pn->ct.wka_port = &adapter->nsp;
	gid_pn->ct.handler = zfcp_fc_ns_handler;
	gid_pn->ct.handler_data = (unsigned long) &compl_rec;
	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;

	init_completion(&compl_rec.done);
	compl_rec.handler = zfcp_fc_ns_gid_pn_eval;
	compl_rec.handler_data = (unsigned long) gid_pn;
	ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
			       erp_action);
	if (!ret)
		wait_for_completion(&compl_rec.done);
	return ret;
}

/**
 * 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(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));

	ret = zfcp_wka_port_get(&adapter->nsp);
	if (ret)
		goto out;

	ret = zfcp_fc_ns_gid_pn_request(erp_action, gid_pn);

	zfcp_wka_port_put(&adapter->nsp);
out:
	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 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 *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));

	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)
		return;

	/* send of ADISC was not possible */
	zfcp_port_put(port);
	if (retval != -EBUSY)
		zfcp_erp_port_forced_reopen(port, 0, 65, NULL);
}

static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft)
{
	struct scatterlist *sg = &gpn_ft->sg_req;

	kfree(sg_virt(sg)); /* free request buffer */
	zfcp_sg_free_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS);

	kfree(gpn_ft);
}

static struct zfcp_gpn_ft *zfcp_alloc_sg_env(void)
{
	struct zfcp_gpn_ft *gpn_ft;
	struct ct_iu_gpn_ft_req *req;

	gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
	if (!gpn_ft)
		return NULL;

	req = kzalloc(sizeof(struct ct_iu_gpn_ft_req), GFP_KERNEL);
	if (!req) {
		kfree(gpn_ft);
		gpn_ft = NULL;
		goto out;
	}
	sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));

	if (zfcp_sg_setup_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS)) {
		zfcp_free_sg_env(gpn_ft);
		gpn_ft = NULL;
	}
out:
	return gpn_ft;
}


static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft,
				  struct zfcp_adapter *adapter)
{
	struct zfcp_send_ct *ct = &gpn_ft->ct;
	struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
	struct zfcp_fc_ns_handler_data compl_rec;
	int ret;

	/* prepare CT IU for GPN_FT */
	req->header.revision = ZFCP_CT_REVISION;
	req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
	req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
	req->header.options = ZFCP_CT_SYNCHRONOUS;
	req->header.cmd_rsp_code = ZFCP_CT_GPN_FT;
	req->header.max_res_size = (sizeof(struct gpn_ft_resp_acc) *
					(ZFCP_GPN_FT_MAX_ENTRIES - 1)) >> 2;
	req->flags = 0;
	req->domain_id_scope = 0;
	req->area_id_scope = 0;
	req->fc4_type = ZFCP_CT_SCSI_FCP;

	/* prepare zfcp_send_ct */
	ct->wka_port = &adapter->nsp;
	ct->handler = zfcp_fc_ns_handler;
	ct->handler_data = (unsigned long)&compl_rec;
	ct->timeout = 10;
	ct->req = &gpn_ft->sg_req;
	ct->resp = gpn_ft->sg_resp;
	ct->req_count = 1;
	ct->resp_count = ZFCP_GPN_FT_BUFFERS;

	init_completion(&compl_rec.done);
	compl_rec.handler = NULL;
	ret = zfcp_fsf_send_ct(ct, NULL, NULL);
	if (!ret)
		wait_for_completion(&compl_rec.done);
	return ret;
}

static void zfcp_validate_port(struct zfcp_port *port)
{
	struct zfcp_adapter *adapter = port->adapter;

	atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);

	if ((port->supported_classes != 0) ||
	    !list_empty(&port->unit_list_head)) {
		zfcp_port_put(port);
		return;
	}
	zfcp_erp_port_shutdown(port, 0, 151, NULL);
	zfcp_erp_wait(adapter);
	zfcp_port_put(port);
	zfcp_port_dequeue(port);
}

static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft)
{
	struct zfcp_send_ct *ct = &gpn_ft->ct;
	struct scatterlist *sg = gpn_ft->sg_resp;
	struct ct_hdr *hdr = sg_virt(sg);
	struct gpn_ft_resp_acc *acc = sg_virt(sg);
	struct zfcp_adapter *adapter = ct->wka_port->adapter;
	struct zfcp_port *port, *tmp;
	u32 d_id;
	int ret = 0, x, last = 0;

	if (ct->status)
		return -EIO;

	if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) {
		if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD)
			return -EAGAIN; /* might be a temporary condition */
		return -EIO;
	}

	if (hdr->max_res_size)
		return -E2BIG;

	down(&zfcp_data.config_sema);

	/* first entry is the header */
	for (x = 1; x < ZFCP_GPN_FT_MAX_ENTRIES && !last; x++) {
		if (x % (ZFCP_GPN_FT_ENTRIES + 1))
			acc++;
		else
			acc = sg_virt(++sg);

		last = acc->control & 0x80;
		d_id = acc->port_id[0] << 16 | acc->port_id[1] << 8 |
		       acc->port_id[2];

		/* don't attach ports with a well known address */
		if ((d_id & ZFCP_DID_WKA) == ZFCP_DID_WKA)
			continue;
		/* skip the adapter's port and known remote ports */
		if (acc->wwpn == fc_host_port_name(adapter->scsi_host))
			continue;
		port = zfcp_get_port_by_wwpn(adapter, acc->wwpn);
		if (port) {
			zfcp_port_get(port);
			continue;
		}

		port = zfcp_port_enqueue(adapter, acc->wwpn,
					 ZFCP_STATUS_PORT_DID_DID |
					 ZFCP_STATUS_COMMON_NOESC, d_id);
		if (IS_ERR(port))
			ret = PTR_ERR(port);
		else
			zfcp_erp_port_reopen(port, 0, 149, NULL);
	}

	zfcp_erp_wait(adapter);
	list_for_each_entry_safe(port, tmp, &adapter->port_list_head, list)
		zfcp_validate_port(port);
	up(&zfcp_data.config_sema);
	return ret;
}

/**
 * zfcp_scan_ports - scan remote ports and attach new ports
 * @adapter: pointer to struct zfcp_adapter
 */
int zfcp_scan_ports(struct zfcp_adapter *adapter)
{
	int ret, i;
	struct zfcp_gpn_ft *gpn_ft;

	if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT)
		return 0;

	ret = zfcp_wka_port_get(&adapter->nsp);
	if (ret)
		return ret;

	gpn_ft = zfcp_alloc_sg_env();
	if (!gpn_ft) {
		ret = -ENOMEM;
		goto out;
	}

	for (i = 0; i < 3; i++) {
		ret = zfcp_scan_issue_gpn_ft(gpn_ft, adapter);
		if (!ret) {
			ret = zfcp_scan_eval_gpn_ft(gpn_ft);
			if (ret == -EAGAIN)
				ssleep(1);
			else
				break;
		}
	}
	zfcp_free_sg_env(gpn_ft);
out:
	zfcp_wka_port_put(&adapter->nsp);
	return ret;
}


void _zfcp_scan_ports_later(struct work_struct *work)
{
	zfcp_scan_ports(container_of(work, struct zfcp_adapter, scan_work));
}
Commit	Line	Data
24073b47 CS	1	/*
	2	* zfcp device driver
	3	*
	4	* Fibre Channel related functions for the zfcp device driver.
	5	*
	6	* Copyright IBM Corporation 2008
	7	*/
	8
	9	#include "zfcp_ext.h"
	10
cc8c2829 SS	11	struct ct_iu_gpn_ft_req {
	12	struct ct_hdr header;
	13	u8 flags;
	14	u8 domain_id_scope;
	15	u8 area_id_scope;
	16	u8 fc4_type;
	17	} __attribute__ ((packed));
	18
	19	struct gpn_ft_resp_acc {
	20	u8 control;
	21	u8 port_id[3];
	22	u8 reserved[4];
	23	u64 wwpn;
	24	} __attribute__ ((packed));
	25
	26	#define ZFCP_GPN_FT_ENTRIES ((PAGE_SIZE - sizeof(struct ct_hdr)) \
	27	/ sizeof(struct gpn_ft_resp_acc))
	28	#define ZFCP_GPN_FT_BUFFERS 4
	29	#define ZFCP_GPN_FT_MAX_ENTRIES ZFCP_GPN_FT_BUFFERS * (ZFCP_GPN_FT_ENTRIES + 1)
	30
	31	struct ct_iu_gpn_ft_resp {
	32	struct ct_hdr header;
	33	struct gpn_ft_resp_acc accept[ZFCP_GPN_FT_ENTRIES];
	34	} __attribute__ ((packed));
	35
	36	struct zfcp_gpn_ft {
	37	struct zfcp_send_ct ct;
	38	struct scatterlist sg_req;
	39	struct scatterlist sg_resp[ZFCP_GPN_FT_BUFFERS];
	40	};
	41
5ab944f9 SS	42	struct zfcp_fc_ns_handler_data {
	43	struct completion done;
	44	void (*handler)(unsigned long);
	45	unsigned long handler_data;
	46	};
	47
	48	static int zfcp_wka_port_get(struct zfcp_wka_port *wka_port)
	49	{
	50	if (mutex_lock_interruptible(&wka_port->mutex))
	51	return -ERESTARTSYS;
	52
1c1cba17 CS	53	if (wka_port->status == ZFCP_WKA_PORT_OFFLINE \|\|
1c1cba17 CS	54	wka_port->status == ZFCP_WKA_PORT_CLOSING) {
5ab944f9 SS	55	wka_port->status = ZFCP_WKA_PORT_OPENING;
	56	if (zfcp_fsf_open_wka_port(wka_port))
	57	wka_port->status = ZFCP_WKA_PORT_OFFLINE;
	58	}
	59
	60	mutex_unlock(&wka_port->mutex);
	61
	62	wait_event_timeout(
	63	wka_port->completion_wq,
	64	wka_port->status == ZFCP_WKA_PORT_ONLINE \|\|
	65	wka_port->status == ZFCP_WKA_PORT_OFFLINE,
	66	HZ >> 1);
	67
	68	if (wka_port->status == ZFCP_WKA_PORT_ONLINE) {
	69	atomic_inc(&wka_port->refcount);
	70	return 0;
	71	}
	72	return -EIO;
	73	}
	74
	75	static void zfcp_wka_port_offline(struct work_struct *work)
	76	{
	77	struct delayed_work *dw = container_of(work, struct delayed_work, work);
	78	struct zfcp_wka_port *wka_port =
	79	container_of(dw, struct zfcp_wka_port, work);
	80
	81	wait_event(wka_port->completion_wq,
	82	atomic_read(&wka_port->refcount) == 0);
	83
	84	mutex_lock(&wka_port->mutex);
	85	if ((atomic_read(&wka_port->refcount) != 0) \|\|
	86	(wka_port->status != ZFCP_WKA_PORT_ONLINE))
	87	goto out;
	88
	89	wka_port->status = ZFCP_WKA_PORT_CLOSING;
	90	if (zfcp_fsf_close_wka_port(wka_port)) {
	91	wka_port->status = ZFCP_WKA_PORT_OFFLINE;
	92	wake_up(&wka_port->completion_wq);
	93	}
	94	out:
	95	mutex_unlock(&wka_port->mutex);
	96	}
	97
	98	static void zfcp_wka_port_put(struct zfcp_wka_port *wka_port)
	99	{
	100	if (atomic_dec_return(&wka_port->refcount) != 0)
	101	return;
	102	/* wait 10 miliseconds, other reqs might pop in */
	103	schedule_delayed_work(&wka_port->work, HZ / 100);
	104	}
	105
	106	void zfcp_fc_nameserver_init(struct zfcp_adapter *adapter)
	107	{
	108	struct zfcp_wka_port *wka_port = &adapter->nsp;
	109
	110	init_waitqueue_head(&wka_port->completion_wq);
	111
	112	wka_port->adapter = adapter;
	113	wka_port->d_id = ZFCP_DID_DIRECTORY_SERVICE;
	114
	115	wka_port->status = ZFCP_WKA_PORT_OFFLINE;
	116	atomic_set(&wka_port->refcount, 0);
	117	mutex_init(&wka_port->mutex);
	118	INIT_DELAYED_WORK(&wka_port->work, zfcp_wka_port_offline);
119	}
120
24073b47 CS	121	static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
	122	struct fcp_rscn_element *elem)
	123	{
	124	unsigned long flags;
	125	struct zfcp_port *port;
	126
	127	read_lock_irqsave(&zfcp_data.config_lock, flags);
	128	list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) {
bce02614	129	if (!(atomic_read(&port->status) & ZFCP_STATUS_PORT_PHYS_OPEN))
24073b47 CS	130	/* Try to connect to unused ports anyway. */
	131	zfcp_erp_port_reopen(port,
	132	ZFCP_STATUS_COMMON_ERP_FAILED,
	133	82, fsf_req);
	134	else if ((port->d_id & range) == (elem->nport_did & range))
	135	/* Check connection status for connected ports */
	136	zfcp_test_link(port);
	137	}
	138	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
	139	}
	140
	141	static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
	142	{
	143	struct fsf_status_read_buffer status_buffer = (void )fsf_req->data;
	144	struct fcp_rscn_head *fcp_rscn_head;
	145	struct fcp_rscn_element *fcp_rscn_element;
	146	u16 i;
	147	u16 no_entries;
	148	u32 range_mask;
	149
c41f8cbd SS	150	fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload.data;
c41f8cbd SS	151	fcp_rscn_element = (struct fcp_rscn_element *) fcp_rscn_head;
24073b47 CS	152
	153	/* see FC-FS */
	154	no_entries = fcp_rscn_head->payload_len /
	155	sizeof(struct fcp_rscn_element);
	156
	157	for (i = 1; i < no_entries; i++) {
	158	/* skip head and start with 1st element */
	159	fcp_rscn_element++;
	160	switch (fcp_rscn_element->addr_format) {
	161	case ZFCP_PORT_ADDRESS:
	162	range_mask = ZFCP_PORTS_RANGE_PORT;
	163	break;
	164	case ZFCP_AREA_ADDRESS:
	165	range_mask = ZFCP_PORTS_RANGE_AREA;
	166	break;
	167	case ZFCP_DOMAIN_ADDRESS:
	168	range_mask = ZFCP_PORTS_RANGE_DOMAIN;
	169	break;
	170	case ZFCP_FABRIC_ADDRESS:
	171	range_mask = ZFCP_PORTS_RANGE_FABRIC;
	172	break;
	173	default:
	174	continue;
	175	}
	176	_zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
	177	}
cc8c2829	178	schedule_work(&fsf_req->adapter->scan_work);
24073b47 CS	179	}
24073b47 CS	180
7ba58c9c	181	static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
24073b47 CS	182	{
	183	struct zfcp_adapter *adapter = req->adapter;
	184	struct zfcp_port *port;
	185	unsigned long flags;
	186
	187	read_lock_irqsave(&zfcp_data.config_lock, flags);
	188	list_for_each_entry(port, &adapter->port_list_head, list)
	189	if (port->wwpn == wwpn)
	190	break;
	191	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
	192
	193	if (port && (port->wwpn == wwpn))
	194	zfcp_erp_port_forced_reopen(port, 0, 83, req);
	195	}
	196
	197	static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
	198	{
	199	struct fsf_status_read_buffer *status_buffer =
	200	(struct fsf_status_read_buffer *)req->data;
	201	struct fsf_plogi *els_plogi =
c41f8cbd	202	(struct fsf_plogi *) status_buffer->payload.data;
24073b47 CS	203
	204	zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
	205	}
	206
	207	static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
	208	{
	209	struct fsf_status_read_buffer *status_buffer =
	210	(struct fsf_status_read_buffer *)req->data;
c41f8cbd SS	211	struct fcp_logo *els_logo =
c41f8cbd SS	212	(struct fcp_logo *) status_buffer->payload.data;
24073b47 CS	213
	214	zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
	215	}
	216
	217	/**
	218	* zfcp_fc_incoming_els - handle incoming ELS
	219	* @fsf_req - request which contains incoming ELS
	220	*/
	221	void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
	222	{
	223	struct fsf_status_read_buffer *status_buffer =
	224	(struct fsf_status_read_buffer *) fsf_req->data;
c41f8cbd	225	unsigned int els_type = status_buffer->payload.data[0];
24073b47 CS	226
	227	zfcp_san_dbf_event_incoming_els(fsf_req);
	228	if (els_type == LS_PLOGI)
	229	zfcp_fc_incoming_plogi(fsf_req);
	230	else if (els_type == LS_LOGO)
	231	zfcp_fc_incoming_logo(fsf_req);
	232	else if (els_type == LS_RSCN)
	233	zfcp_fc_incoming_rscn(fsf_req);
	234	}
	235
5ab944f9 SS	236	static void zfcp_fc_ns_handler(unsigned long data)
	237	{
	238	struct zfcp_fc_ns_handler_data *compl_rec =
	239	(struct zfcp_fc_ns_handler_data *) data;
	240
	241	if (compl_rec->handler)
	242	compl_rec->handler(compl_rec->handler_data);
	243
	244	complete(&compl_rec->done);
	245	}
	246
	247	static void zfcp_fc_ns_gid_pn_eval(unsigned long data)
24073b47 CS	248	{
	249	struct zfcp_gid_pn_data gid_pn = (struct zfcp_gid_pn_data ) data;
	250	struct zfcp_send_ct *ct = &gid_pn->ct;
	251	struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
	252	struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
	253	struct zfcp_port *port = gid_pn->port;
	254
	255	if (ct->status)
5ab944f9	256	return;
24073b47 CS	257	if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT) {
24073b47 CS	258	atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
5ab944f9	259	return;
24073b47 CS	260	}
	261	/* paranoia */
	262	if (ct_iu_req->wwpn != port->wwpn)
5ab944f9	263	return;
24073b47 CS	264	/* looks like a valid d_id */
	265	port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
	266	atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
24073b47 CS	267	}
24073b47 CS	268
5ab944f9 SS	269	int static zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action,
5ab944f9 SS	270	struct zfcp_gid_pn_data *gid_pn)
24073b47	271	{
24073b47	272	struct zfcp_adapter *adapter = erp_action->adapter;
5ab944f9 SS	273	struct zfcp_fc_ns_handler_data compl_rec;
5ab944f9 SS	274	int ret;
24073b47 CS	275
	276	/* setup parameters for send generic command */
	277	gid_pn->port = erp_action->port;
5ab944f9 SS	278	gid_pn->ct.wka_port = &adapter->nsp;
	279	gid_pn->ct.handler = zfcp_fc_ns_handler;
	280	gid_pn->ct.handler_data = (unsigned long) &compl_rec;
24073b47 CS	281	gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
	282	gid_pn->ct.req = &gid_pn->req;
	283	gid_pn->ct.resp = &gid_pn->resp;
	284	gid_pn->ct.req_count = 1;
	285	gid_pn->ct.resp_count = 1;
	286	sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
	287	sizeof(struct ct_iu_gid_pn_req));
	288	sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
	289	sizeof(struct ct_iu_gid_pn_resp));
	290
	291	/* setup nameserver request */
	292	gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
	293	gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
	294	gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
	295	gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
	296	gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
	297	gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_MAX_SIZE;
	298	gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;
	299
5ab944f9 SS	300	init_completion(&compl_rec.done);
	301	compl_rec.handler = zfcp_fc_ns_gid_pn_eval;
	302	compl_rec.handler_data = (unsigned long) gid_pn;
24073b47 CS	303	ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
24073b47 CS	304	erp_action);
5ab944f9 SS	305	if (!ret)
	306	wait_for_completion(&compl_rec.done);
	307	return ret;
	308	}
	309
	310	/**
	311	* zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
	312	* @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
	313	* return: -ENOMEM on error, 0 otherwise
	314	*/
	315	int zfcp_fc_ns_gid_pn(struct zfcp_erp_action *erp_action)
	316	{
	317	int ret;
	318	struct zfcp_gid_pn_data *gid_pn;
	319	struct zfcp_adapter *adapter = erp_action->adapter;
	320
	321	gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC);
	322	if (!gid_pn)
	323	return -ENOMEM;
	324
	325	memset(gid_pn, 0, sizeof(*gid_pn));
	326
	327	ret = zfcp_wka_port_get(&adapter->nsp);
24073b47	328	if (ret)
5ab944f9 SS	329	goto out;
	330
	331	ret = zfcp_fc_ns_gid_pn_request(erp_action, gid_pn);
	332
	333	zfcp_wka_port_put(&adapter->nsp);
	334	out:
	335	mempool_free(gid_pn, adapter->pool.data_gid_pn);
24073b47 CS	336	return ret;
	337	}
	338
	339	/**
	340	* zfcp_fc_plogi_evaluate - evaluate PLOGI playload
	341	* @port: zfcp_port structure
	342	* @plogi: plogi payload
	343	*
	344	* Evaluate PLOGI playload and copy important fields into zfcp_port structure
	345	*/
	346	void zfcp_fc_plogi_evaluate(struct zfcp_port port, struct fsf_plogi plogi)
	347	{
	348	port->maxframe_size = plogi->serv_param.common_serv_param[7] \|
	349	((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
	350	if (plogi->serv_param.class1_serv_param[0] & 0x80)
	351	port->supported_classes \|= FC_COS_CLASS1;
	352	if (plogi->serv_param.class2_serv_param[0] & 0x80)
	353	port->supported_classes \|= FC_COS_CLASS2;
	354	if (plogi->serv_param.class3_serv_param[0] & 0x80)
	355	port->supported_classes \|= FC_COS_CLASS3;
	356	if (plogi->serv_param.class4_serv_param[0] & 0x80)
	357	port->supported_classes \|= FC_COS_CLASS4;
	358	}
	359
	360	struct zfcp_els_adisc {
	361	struct zfcp_send_els els;
	362	struct scatterlist req;
	363	struct scatterlist resp;
	364	struct zfcp_ls_adisc ls_adisc;
44cc76f2	365	struct zfcp_ls_adisc ls_adisc_acc;
24073b47 CS	366	};
	367
	368	static void zfcp_fc_adisc_handler(unsigned long data)
	369	{
	370	struct zfcp_els_adisc adisc = (struct zfcp_els_adisc ) data;
	371	struct zfcp_port *port = adisc->els.port;
44cc76f2	372	struct zfcp_ls_adisc *ls_adisc = &adisc->ls_adisc_acc;
24073b47	373
3968ce80	374	if (adisc->els.status) {
24073b47 CS	375	/* request rejected or timed out */
	376	zfcp_erp_port_forced_reopen(port, 0, 63, NULL);
	377	goto out;
	378	}
	379
	380	if (!port->wwnn)
	381	port->wwnn = ls_adisc->wwnn;
	382
	383	if (port->wwpn != ls_adisc->wwpn)
	384	zfcp_erp_port_reopen(port, 0, 64, NULL);
	385
	386	out:
	387	zfcp_port_put(port);
	388	kfree(adisc);
	389	}
	390
	391	static int zfcp_fc_adisc(struct zfcp_port *port)
	392	{
	393	struct zfcp_els_adisc *adisc;
	394	struct zfcp_adapter *adapter = port->adapter;
	395
	396	adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
	397	if (!adisc)
	398	return -ENOMEM;
	399
	400	adisc->els.req = &adisc->req;
	401	adisc->els.resp = &adisc->resp;
	402	sg_init_one(adisc->els.req, &adisc->ls_adisc,
	403	sizeof(struct zfcp_ls_adisc));
	404	sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
44cc76f2	405	sizeof(struct zfcp_ls_adisc));
24073b47 CS	406
	407	adisc->els.req_count = 1;
	408	adisc->els.resp_count = 1;
	409	adisc->els.adapter = adapter;
	410	adisc->els.port = port;
	411	adisc->els.d_id = port->d_id;
	412	adisc->els.handler = zfcp_fc_adisc_handler;
	413	adisc->els.handler_data = (unsigned long) adisc;
	414	adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;
	415
	416	/* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
	417	without FC-AL-2 capability, so we don't set it */
	418	adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
	419	adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
	420	adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);
	421
	422	return zfcp_fsf_send_els(&adisc->els);
	423	}
	424
	425	/**
	426	* zfcp_test_link - lightweight link test procedure
	427	* @port: port to be tested
	428	*
	429	* Test status of a link to a remote port using the ELS command ADISC.
	430	* If there is a problem with the remote port, error recovery steps
	431	* will be triggered.
	432	*/
	433	void zfcp_test_link(struct zfcp_port *port)
	434	{
	435	int retval;
	436
	437	zfcp_port_get(port);
	438	retval = zfcp_fc_adisc(port);
9528539c	439	if (retval == 0)
24073b47 CS	440	return;
	441
	442	/* send of ADISC was not possible */
	443	zfcp_port_put(port);
9528539c SS	444	if (retval != -EBUSY)
9528539c SS	445	zfcp_erp_port_forced_reopen(port, 0, 65, NULL);
24073b47	446	}
cc8c2829	447
cc8c2829 SS	448	static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft)
	449	{
	450	struct scatterlist *sg = &gpn_ft->sg_req;
	451
	452	kfree(sg_virt(sg)); /* free request buffer */
	453	zfcp_sg_free_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS);
	454
	455	kfree(gpn_ft);
	456	}
	457
	458	static struct zfcp_gpn_ft *zfcp_alloc_sg_env(void)
	459	{
	460	struct zfcp_gpn_ft *gpn_ft;
	461	struct ct_iu_gpn_ft_req *req;
	462
	463	gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
	464	if (!gpn_ft)
	465	return NULL;
	466
	467	req = kzalloc(sizeof(struct ct_iu_gpn_ft_req), GFP_KERNEL);
	468	if (!req) {
	469	kfree(gpn_ft);
	470	gpn_ft = NULL;
	471	goto out;
	472	}
	473	sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));
	474
	475	if (zfcp_sg_setup_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS)) {
	476	zfcp_free_sg_env(gpn_ft);
	477	gpn_ft = NULL;
	478	}
	479	out:
	480	return gpn_ft;
	481	}
	482
	483
	484	static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft,
	485	struct zfcp_adapter *adapter)
	486	{
	487	struct zfcp_send_ct *ct = &gpn_ft->ct;
	488	struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
5ab944f9	489	struct zfcp_fc_ns_handler_data compl_rec;
cc8c2829 SS	490	int ret;
	491
	492	/* prepare CT IU for GPN_FT */
	493	req->header.revision = ZFCP_CT_REVISION;
	494	req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
	495	req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
	496	req->header.options = ZFCP_CT_SYNCHRONOUS;
	497	req->header.cmd_rsp_code = ZFCP_CT_GPN_FT;
	498	req->header.max_res_size = (sizeof(struct gpn_ft_resp_acc) *
	499	(ZFCP_GPN_FT_MAX_ENTRIES - 1)) >> 2;
	500	req->flags = 0;
	501	req->domain_id_scope = 0;
	502	req->area_id_scope = 0;
	503	req->fc4_type = ZFCP_CT_SCSI_FCP;
	504
	505	/* prepare zfcp_send_ct */
5ab944f9 SS	506	ct->wka_port = &adapter->nsp;
	507	ct->handler = zfcp_fc_ns_handler;
	508	ct->handler_data = (unsigned long)&compl_rec;
cc8c2829 SS	509	ct->timeout = 10;
	510	ct->req = &gpn_ft->sg_req;
	511	ct->resp = gpn_ft->sg_resp;
	512	ct->req_count = 1;
	513	ct->resp_count = ZFCP_GPN_FT_BUFFERS;
	514
5ab944f9 SS	515	init_completion(&compl_rec.done);
5ab944f9 SS	516	compl_rec.handler = NULL;
cc8c2829 SS	517	ret = zfcp_fsf_send_ct(ct, NULL, NULL);
cc8c2829 SS	518	if (!ret)
5ab944f9	519	wait_for_completion(&compl_rec.done);
cc8c2829 SS	520	return ret;
	521	}
	522
	523	static void zfcp_validate_port(struct zfcp_port *port)
	524	{
	525	struct zfcp_adapter *adapter = port->adapter;
	526
	527	atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
	528
0406289e CS	529	if ((port->supported_classes != 0) \|\|
0406289e CS	530	!list_empty(&port->unit_list_head)) {
cc8c2829 SS	531	zfcp_port_put(port);
	532	return;
	533	}
	534	zfcp_erp_port_shutdown(port, 0, 151, NULL);
	535	zfcp_erp_wait(adapter);
	536	zfcp_port_put(port);
	537	zfcp_port_dequeue(port);
	538	}
	539
	540	static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft)
	541	{
	542	struct zfcp_send_ct *ct = &gpn_ft->ct;
	543	struct scatterlist *sg = gpn_ft->sg_resp;
	544	struct ct_hdr *hdr = sg_virt(sg);
	545	struct gpn_ft_resp_acc *acc = sg_virt(sg);
5ab944f9	546	struct zfcp_adapter *adapter = ct->wka_port->adapter;
cc8c2829 SS	547	struct zfcp_port port, tmp;
cc8c2829 SS	548	u32 d_id;
47f7bba5	549	int ret = 0, x, last = 0;
cc8c2829 SS	550
	551	if (ct->status)
	552	return -EIO;
	553
	554	if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) {
	555	if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD)
	556	return -EAGAIN; /* might be a temporary condition */
	557	return -EIO;
	558	}
	559
	560	if (hdr->max_res_size)
	561	return -E2BIG;
	562
	563	down(&zfcp_data.config_sema);
	564
	565	/* first entry is the header */
47f7bba5	566	for (x = 1; x < ZFCP_GPN_FT_MAX_ENTRIES && !last; x++) {
cc8c2829 SS	567	if (x % (ZFCP_GPN_FT_ENTRIES + 1))
	568	acc++;
	569	else
	570	acc = sg_virt(++sg);
	571
47f7bba5	572	last = acc->control & 0x80;
cc8c2829 SS	573	d_id = acc->port_id[0] << 16 \| acc->port_id[1] << 8 \|
	574	acc->port_id[2];
	575
5ab944f9 SS	576	/* don't attach ports with a well known address */
	577	if ((d_id & ZFCP_DID_WKA) == ZFCP_DID_WKA)
	578	continue;
cc8c2829	579	/* skip the adapter's port and known remote ports */
9528539c	580	if (acc->wwpn == fc_host_port_name(adapter->scsi_host))
cc8c2829	581	continue;
9528539c SS	582	port = zfcp_get_port_by_wwpn(adapter, acc->wwpn);
	583	if (port) {
	584	zfcp_port_get(port);
	585	continue;
	586	}
cc8c2829 SS	587
	588	port = zfcp_port_enqueue(adapter, acc->wwpn,
	589	ZFCP_STATUS_PORT_DID_DID \|
	590	ZFCP_STATUS_COMMON_NOESC, d_id);
317e6b65 SS	591	if (IS_ERR(port))
317e6b65 SS	592	ret = PTR_ERR(port);
cc8c2829	593	else
317e6b65	594	zfcp_erp_port_reopen(port, 0, 149, NULL);
cc8c2829 SS	595	}
	596
	597	zfcp_erp_wait(adapter);
	598	list_for_each_entry_safe(port, tmp, &adapter->port_list_head, list)
	599	zfcp_validate_port(port);
	600	up(&zfcp_data.config_sema);
	601	return ret;
	602	}
	603
	604	/**
	605	* zfcp_scan_ports - scan remote ports and attach new ports
	606	* @adapter: pointer to struct zfcp_adapter
	607	*/
	608	int zfcp_scan_ports(struct zfcp_adapter *adapter)
	609	{
	610	int ret, i;
	611	struct zfcp_gpn_ft *gpn_ft;
	612
	613	if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT)
	614	return 0;
	615
5ab944f9	616	ret = zfcp_wka_port_get(&adapter->nsp);
cc8c2829 SS	617	if (ret)
	618	return ret;
	619
	620	gpn_ft = zfcp_alloc_sg_env();
5ab944f9 SS	621	if (!gpn_ft) {
	622	ret = -ENOMEM;
	623	goto out;
	624	}
cc8c2829 SS	625
	626	for (i = 0; i < 3; i++) {
	627	ret = zfcp_scan_issue_gpn_ft(gpn_ft, adapter);
	628	if (!ret) {
	629	ret = zfcp_scan_eval_gpn_ft(gpn_ft);
	630	if (ret == -EAGAIN)
	631	ssleep(1);
	632	else
	633	break;
	634	}
	635	}
	636	zfcp_free_sg_env(gpn_ft);
5ab944f9 SS	637	out:
5ab944f9 SS	638	zfcp_wka_port_put(&adapter->nsp);
cc8c2829 SS	639	return ret;
	640	}
	641
	642
	643	void _zfcp_scan_ports_later(struct work_struct *work)
	644	{
	645	zfcp_scan_ports(container_of(work, struct zfcp_adapter, scan_work));
	646	}