[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
 */

#define KMSG_COMPONENT "zfcp"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include "zfcp_ext.h"

enum rscn_address_format {
	RSCN_PORT_ADDRESS	= 0x0,
	RSCN_AREA_ADDRESS	= 0x1,
	RSCN_DOMAIN_ADDRESS	= 0x2,
	RSCN_FABRIC_ADDRESS	= 0x3,
};

static u32 rscn_range_mask[] = {
	[RSCN_PORT_ADDRESS]		= 0xFFFFFF,
	[RSCN_AREA_ADDRESS]		= 0xFFFF00,
	[RSCN_DOMAIN_ADDRESS]		= 0xFF0000,
	[RSCN_FABRIC_ADDRESS]		= 0x000000,
};

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++;
		range_mask = rscn_range_mask[fcp_rscn_element->addr_format];
		_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;
}

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_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
ecf39d42 CS	9	#define KMSG_COMPONENT "zfcp"
	10	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	11
24073b47 CS	12	#include "zfcp_ext.h"
24073b47 CS	13
e0d7fcb5 CS	14	enum rscn_address_format {
	15	RSCN_PORT_ADDRESS = 0x0,
	16	RSCN_AREA_ADDRESS = 0x1,
	17	RSCN_DOMAIN_ADDRESS = 0x2,
	18	RSCN_FABRIC_ADDRESS = 0x3,
	19	};
	20
	21	static u32 rscn_range_mask[] = {
	22	[RSCN_PORT_ADDRESS] = 0xFFFFFF,
	23	[RSCN_AREA_ADDRESS] = 0xFFFF00,
	24	[RSCN_DOMAIN_ADDRESS] = 0xFF0000,
	25	[RSCN_FABRIC_ADDRESS] = 0x000000,
	26	};
	27
cc8c2829 SS	28	struct ct_iu_gpn_ft_req {
	29	struct ct_hdr header;
	30	u8 flags;
	31	u8 domain_id_scope;
	32	u8 area_id_scope;
	33	u8 fc4_type;
	34	} __attribute__ ((packed));
	35
	36	struct gpn_ft_resp_acc {
	37	u8 control;
	38	u8 port_id[3];
	39	u8 reserved[4];
	40	u64 wwpn;
	41	} __attribute__ ((packed));
	42
	43	#define ZFCP_GPN_FT_ENTRIES ((PAGE_SIZE - sizeof(struct ct_hdr)) \
	44	/ sizeof(struct gpn_ft_resp_acc))
	45	#define ZFCP_GPN_FT_BUFFERS 4
	46	#define ZFCP_GPN_FT_MAX_ENTRIES ZFCP_GPN_FT_BUFFERS * (ZFCP_GPN_FT_ENTRIES + 1)
	47
	48	struct ct_iu_gpn_ft_resp {
	49	struct ct_hdr header;
	50	struct gpn_ft_resp_acc accept[ZFCP_GPN_FT_ENTRIES];
	51	} __attribute__ ((packed));
	52
	53	struct zfcp_gpn_ft {
	54	struct zfcp_send_ct ct;
	55	struct scatterlist sg_req;
	56	struct scatterlist sg_resp[ZFCP_GPN_FT_BUFFERS];
	57	};
	58
5ab944f9 SS	59	struct zfcp_fc_ns_handler_data {
	60	struct completion done;
	61	void (*handler)(unsigned long);
	62	unsigned long handler_data;
	63	};
	64
	65	static int zfcp_wka_port_get(struct zfcp_wka_port *wka_port)
	66	{
	67	if (mutex_lock_interruptible(&wka_port->mutex))
	68	return -ERESTARTSYS;
	69
1c1cba17 CS	70	if (wka_port->status == ZFCP_WKA_PORT_OFFLINE \|\|
1c1cba17 CS	71	wka_port->status == ZFCP_WKA_PORT_CLOSING) {
5ab944f9 SS	72	wka_port->status = ZFCP_WKA_PORT_OPENING;
	73	if (zfcp_fsf_open_wka_port(wka_port))
	74	wka_port->status = ZFCP_WKA_PORT_OFFLINE;
	75	}
	76
	77	mutex_unlock(&wka_port->mutex);
	78
	79	wait_event_timeout(
	80	wka_port->completion_wq,
	81	wka_port->status == ZFCP_WKA_PORT_ONLINE \|\|
	82	wka_port->status == ZFCP_WKA_PORT_OFFLINE,
	83	HZ >> 1);
	84
	85	if (wka_port->status == ZFCP_WKA_PORT_ONLINE) {
	86	atomic_inc(&wka_port->refcount);
	87	return 0;
	88	}
	89	return -EIO;
	90	}
	91
	92	static void zfcp_wka_port_offline(struct work_struct *work)
	93	{
	94	struct delayed_work *dw = container_of(work, struct delayed_work, work);
	95	struct zfcp_wka_port *wka_port =
	96	container_of(dw, struct zfcp_wka_port, work);
	97
	98	wait_event(wka_port->completion_wq,
	99	atomic_read(&wka_port->refcount) == 0);
	100
	101	mutex_lock(&wka_port->mutex);
	102	if ((atomic_read(&wka_port->refcount) != 0) \|\|
	103	(wka_port->status != ZFCP_WKA_PORT_ONLINE))
	104	goto out;
	105
	106	wka_port->status = ZFCP_WKA_PORT_CLOSING;
	107	if (zfcp_fsf_close_wka_port(wka_port)) {
	108	wka_port->status = ZFCP_WKA_PORT_OFFLINE;
	109	wake_up(&wka_port->completion_wq);
	110	}
	111	out:
	112	mutex_unlock(&wka_port->mutex);
	113	}
	114
	115	static void zfcp_wka_port_put(struct zfcp_wka_port *wka_port)
	116	{
	117	if (atomic_dec_return(&wka_port->refcount) != 0)
	118	return;
	119	/* wait 10 miliseconds, other reqs might pop in */
	120	schedule_delayed_work(&wka_port->work, HZ / 100);
	121	}
	122
	123	void zfcp_fc_nameserver_init(struct zfcp_adapter *adapter)
	124	{
	125	struct zfcp_wka_port *wka_port = &adapter->nsp;
	126
	127	init_waitqueue_head(&wka_port->completion_wq);
	128
	129	wka_port->adapter = adapter;
	130	wka_port->d_id = ZFCP_DID_DIRECTORY_SERVICE;
	131
	132	wka_port->status = ZFCP_WKA_PORT_OFFLINE;
	133	atomic_set(&wka_port->refcount, 0);
	134	mutex_init(&wka_port->mutex);
	135	INIT_DELAYED_WORK(&wka_port->work, zfcp_wka_port_offline);
136	}
137
24073b47 CS	138	static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
	139	struct fcp_rscn_element *elem)
	140	{
	141	unsigned long flags;
	142	struct zfcp_port *port;
	143
	144	read_lock_irqsave(&zfcp_data.config_lock, flags);
	145	list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) {
bce02614	146	if (!(atomic_read(&port->status) & ZFCP_STATUS_PORT_PHYS_OPEN))
24073b47 CS	147	/* Try to connect to unused ports anyway. */
	148	zfcp_erp_port_reopen(port,
	149	ZFCP_STATUS_COMMON_ERP_FAILED,
	150	82, fsf_req);
	151	else if ((port->d_id & range) == (elem->nport_did & range))
	152	/* Check connection status for connected ports */
	153	zfcp_test_link(port);
	154	}
	155	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
	156	}
	157
	158	static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
	159	{
	160	struct fsf_status_read_buffer status_buffer = (void )fsf_req->data;
	161	struct fcp_rscn_head *fcp_rscn_head;
	162	struct fcp_rscn_element *fcp_rscn_element;
	163	u16 i;
	164	u16 no_entries;
	165	u32 range_mask;
	166
c41f8cbd SS	167	fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload.data;
c41f8cbd SS	168	fcp_rscn_element = (struct fcp_rscn_element *) fcp_rscn_head;
24073b47 CS	169
	170	/* see FC-FS */
	171	no_entries = fcp_rscn_head->payload_len /
	172	sizeof(struct fcp_rscn_element);
	173
	174	for (i = 1; i < no_entries; i++) {
	175	/* skip head and start with 1st element */
	176	fcp_rscn_element++;
e0d7fcb5	177	range_mask = rscn_range_mask[fcp_rscn_element->addr_format];
24073b47 CS	178	_zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
24073b47 CS	179	}
cc8c2829	180	schedule_work(&fsf_req->adapter->scan_work);
24073b47 CS	181	}
24073b47 CS	182
7ba58c9c	183	static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
24073b47 CS	184	{
	185	struct zfcp_adapter *adapter = req->adapter;
	186	struct zfcp_port *port;
	187	unsigned long flags;
	188
	189	read_lock_irqsave(&zfcp_data.config_lock, flags);
	190	list_for_each_entry(port, &adapter->port_list_head, list)
	191	if (port->wwpn == wwpn)
	192	break;
	193	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
	194
	195	if (port && (port->wwpn == wwpn))
	196	zfcp_erp_port_forced_reopen(port, 0, 83, req);
	197	}
	198
	199	static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
	200	{
	201	struct fsf_status_read_buffer *status_buffer =
	202	(struct fsf_status_read_buffer *)req->data;
	203	struct fsf_plogi *els_plogi =
c41f8cbd	204	(struct fsf_plogi *) status_buffer->payload.data;
24073b47 CS	205
	206	zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
	207	}
	208
	209	static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
	210	{
	211	struct fsf_status_read_buffer *status_buffer =
	212	(struct fsf_status_read_buffer *)req->data;
c41f8cbd SS	213	struct fcp_logo *els_logo =
c41f8cbd SS	214	(struct fcp_logo *) status_buffer->payload.data;
24073b47 CS	215
	216	zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
	217	}
	218
	219	/**
	220	* zfcp_fc_incoming_els - handle incoming ELS
	221	* @fsf_req - request which contains incoming ELS
	222	*/
	223	void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
	224	{
	225	struct fsf_status_read_buffer *status_buffer =
	226	(struct fsf_status_read_buffer *) fsf_req->data;
c41f8cbd	227	unsigned int els_type = status_buffer->payload.data[0];
24073b47 CS	228
	229	zfcp_san_dbf_event_incoming_els(fsf_req);
	230	if (els_type == LS_PLOGI)
	231	zfcp_fc_incoming_plogi(fsf_req);
	232	else if (els_type == LS_LOGO)
	233	zfcp_fc_incoming_logo(fsf_req);
	234	else if (els_type == LS_RSCN)
	235	zfcp_fc_incoming_rscn(fsf_req);
	236	}
	237
5ab944f9 SS	238	static void zfcp_fc_ns_handler(unsigned long data)
	239	{
	240	struct zfcp_fc_ns_handler_data *compl_rec =
	241	(struct zfcp_fc_ns_handler_data *) data;
	242
	243	if (compl_rec->handler)
	244	compl_rec->handler(compl_rec->handler_data);
	245
	246	complete(&compl_rec->done);
	247	}
	248
	249	static void zfcp_fc_ns_gid_pn_eval(unsigned long data)
24073b47 CS	250	{
	251	struct zfcp_gid_pn_data gid_pn = (struct zfcp_gid_pn_data ) data;
	252	struct zfcp_send_ct *ct = &gid_pn->ct;
	253	struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
	254	struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
	255	struct zfcp_port *port = gid_pn->port;
	256
	257	if (ct->status)
5ab944f9	258	return;
24073b47 CS	259	if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT) {
24073b47 CS	260	atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
5ab944f9	261	return;
24073b47 CS	262	}
	263	/* paranoia */
	264	if (ct_iu_req->wwpn != port->wwpn)
5ab944f9	265	return;
24073b47 CS	266	/* looks like a valid d_id */
24073b47 CS	267	port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
24073b47 CS	268	}
24073b47 CS	269
5ab944f9 SS	270	int static zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action,
5ab944f9 SS	271	struct zfcp_gid_pn_data *gid_pn)
24073b47	272	{
24073b47	273	struct zfcp_adapter *adapter = erp_action->adapter;
5ab944f9 SS	274	struct zfcp_fc_ns_handler_data compl_rec;
5ab944f9 SS	275	int ret;
24073b47 CS	276
	277	/* setup parameters for send generic command */
	278	gid_pn->port = erp_action->port;
5ab944f9 SS	279	gid_pn->ct.wka_port = &adapter->nsp;
	280	gid_pn->ct.handler = zfcp_fc_ns_handler;
	281	gid_pn->ct.handler_data = (unsigned long) &compl_rec;
24073b47 CS	282	gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
	283	gid_pn->ct.req = &gid_pn->req;
	284	gid_pn->ct.resp = &gid_pn->resp;
	285	gid_pn->ct.req_count = 1;
	286	gid_pn->ct.resp_count = 1;
	287	sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
	288	sizeof(struct ct_iu_gid_pn_req));
	289	sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
	290	sizeof(struct ct_iu_gid_pn_resp));
	291
	292	/* setup nameserver request */
	293	gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
	294	gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
	295	gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
	296	gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
	297	gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
	298	gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_MAX_SIZE;
	299	gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;
	300
5ab944f9 SS	301	init_completion(&compl_rec.done);
	302	compl_rec.handler = zfcp_fc_ns_gid_pn_eval;
	303	compl_rec.handler_data = (unsigned long) gid_pn;
24073b47 CS	304	ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
24073b47 CS	305	erp_action);
5ab944f9 SS	306	if (!ret)
	307	wait_for_completion(&compl_rec.done);
	308	return ret;
	309	}
	310
	311	/**
	312	* zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
	313	* @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
	314	* return: -ENOMEM on error, 0 otherwise
	315	*/
	316	int zfcp_fc_ns_gid_pn(struct zfcp_erp_action *erp_action)
	317	{
	318	int ret;
	319	struct zfcp_gid_pn_data *gid_pn;
	320	struct zfcp_adapter *adapter = erp_action->adapter;
	321
	322	gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC);
	323	if (!gid_pn)
	324	return -ENOMEM;
	325
	326	memset(gid_pn, 0, sizeof(*gid_pn));
	327
	328	ret = zfcp_wka_port_get(&adapter->nsp);
24073b47	329	if (ret)
5ab944f9 SS	330	goto out;
	331
	332	ret = zfcp_fc_ns_gid_pn_request(erp_action, gid_pn);
	333
	334	zfcp_wka_port_put(&adapter->nsp);
	335	out:
	336	mempool_free(gid_pn, adapter->pool.data_gid_pn);
24073b47 CS	337	return ret;
	338	}
	339
	340	/**
	341	* zfcp_fc_plogi_evaluate - evaluate PLOGI playload
	342	* @port: zfcp_port structure
	343	* @plogi: plogi payload
	344	*
	345	* Evaluate PLOGI playload and copy important fields into zfcp_port structure
	346	*/
	347	void zfcp_fc_plogi_evaluate(struct zfcp_port port, struct fsf_plogi plogi)
	348	{
	349	port->maxframe_size = plogi->serv_param.common_serv_param[7] \|
	350	((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
	351	if (plogi->serv_param.class1_serv_param[0] & 0x80)
	352	port->supported_classes \|= FC_COS_CLASS1;
	353	if (plogi->serv_param.class2_serv_param[0] & 0x80)
	354	port->supported_classes \|= FC_COS_CLASS2;
	355	if (plogi->serv_param.class3_serv_param[0] & 0x80)
	356	port->supported_classes \|= FC_COS_CLASS3;
	357	if (plogi->serv_param.class4_serv_param[0] & 0x80)
	358	port->supported_classes \|= FC_COS_CLASS4;
	359	}
	360
	361	struct zfcp_els_adisc {
	362	struct zfcp_send_els els;
	363	struct scatterlist req;
	364	struct scatterlist resp;
	365	struct zfcp_ls_adisc ls_adisc;
44cc76f2	366	struct zfcp_ls_adisc ls_adisc_acc;
24073b47 CS	367	};
	368
	369	static void zfcp_fc_adisc_handler(unsigned long data)
	370	{
	371	struct zfcp_els_adisc adisc = (struct zfcp_els_adisc ) data;
	372	struct zfcp_port *port = adisc->els.port;
44cc76f2	373	struct zfcp_ls_adisc *ls_adisc = &adisc->ls_adisc_acc;
24073b47	374
3968ce80	375	if (adisc->els.status) {
24073b47 CS	376	/* request rejected or timed out */
	377	zfcp_erp_port_forced_reopen(port, 0, 63, NULL);
	378	goto out;
	379	}
	380
	381	if (!port->wwnn)
	382	port->wwnn = ls_adisc->wwnn;
	383
	384	if (port->wwpn != ls_adisc->wwpn)
	385	zfcp_erp_port_reopen(port, 0, 64, NULL);
	386
	387	out:
	388	zfcp_port_put(port);
	389	kfree(adisc);
	390	}
	391
	392	static int zfcp_fc_adisc(struct zfcp_port *port)
	393	{
	394	struct zfcp_els_adisc *adisc;
	395	struct zfcp_adapter *adapter = port->adapter;
	396
	397	adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
	398	if (!adisc)
	399	return -ENOMEM;
	400
	401	adisc->els.req = &adisc->req;
	402	adisc->els.resp = &adisc->resp;
	403	sg_init_one(adisc->els.req, &adisc->ls_adisc,
	404	sizeof(struct zfcp_ls_adisc));
	405	sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
44cc76f2	406	sizeof(struct zfcp_ls_adisc));
24073b47 CS	407
	408	adisc->els.req_count = 1;
	409	adisc->els.resp_count = 1;
	410	adisc->els.adapter = adapter;
	411	adisc->els.port = port;
	412	adisc->els.d_id = port->d_id;
	413	adisc->els.handler = zfcp_fc_adisc_handler;
	414	adisc->els.handler_data = (unsigned long) adisc;
	415	adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;
	416
	417	/* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
	418	without FC-AL-2 capability, so we don't set it */
	419	adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
	420	adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
	421	adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);
	422
	423	return zfcp_fsf_send_els(&adisc->els);
	424	}
	425
	426	/**
	427	* zfcp_test_link - lightweight link test procedure
	428	* @port: port to be tested
	429	*
	430	* Test status of a link to a remote port using the ELS command ADISC.
	431	* If there is a problem with the remote port, error recovery steps
	432	* will be triggered.
	433	*/
	434	void zfcp_test_link(struct zfcp_port *port)
	435	{
	436	int retval;
	437
	438	zfcp_port_get(port);
	439	retval = zfcp_fc_adisc(port);
9528539c	440	if (retval == 0)
24073b47 CS	441	return;
	442
	443	/* send of ADISC was not possible */
	444	zfcp_port_put(port);
9528539c SS	445	if (retval != -EBUSY)
9528539c SS	446	zfcp_erp_port_forced_reopen(port, 0, 65, NULL);
24073b47	447	}
cc8c2829	448
cc8c2829 SS	449	static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft)
	450	{
	451	struct scatterlist *sg = &gpn_ft->sg_req;
	452
	453	kfree(sg_virt(sg)); /* free request buffer */
	454	zfcp_sg_free_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS);
	455
	456	kfree(gpn_ft);
	457	}
	458
	459	static struct zfcp_gpn_ft *zfcp_alloc_sg_env(void)
	460	{
	461	struct zfcp_gpn_ft *gpn_ft;
	462	struct ct_iu_gpn_ft_req *req;
	463
	464	gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
	465	if (!gpn_ft)
	466	return NULL;
	467
	468	req = kzalloc(sizeof(struct ct_iu_gpn_ft_req), GFP_KERNEL);
	469	if (!req) {
	470	kfree(gpn_ft);
	471	gpn_ft = NULL;
	472	goto out;
	473	}
	474	sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));
	475
	476	if (zfcp_sg_setup_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS)) {
	477	zfcp_free_sg_env(gpn_ft);
	478	gpn_ft = NULL;
	479	}
	480	out:
	481	return gpn_ft;
	482	}
	483
	484
	485	static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft,
	486	struct zfcp_adapter *adapter)
	487	{
	488	struct zfcp_send_ct *ct = &gpn_ft->ct;
	489	struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
5ab944f9	490	struct zfcp_fc_ns_handler_data compl_rec;
cc8c2829 SS	491	int ret;
	492
	493	/* prepare CT IU for GPN_FT */
	494	req->header.revision = ZFCP_CT_REVISION;
	495	req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
	496	req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
	497	req->header.options = ZFCP_CT_SYNCHRONOUS;
	498	req->header.cmd_rsp_code = ZFCP_CT_GPN_FT;
	499	req->header.max_res_size = (sizeof(struct gpn_ft_resp_acc) *
	500	(ZFCP_GPN_FT_MAX_ENTRIES - 1)) >> 2;
	501	req->flags = 0;
	502	req->domain_id_scope = 0;
	503	req->area_id_scope = 0;
	504	req->fc4_type = ZFCP_CT_SCSI_FCP;
	505
	506	/* prepare zfcp_send_ct */
5ab944f9 SS	507	ct->wka_port = &adapter->nsp;
	508	ct->handler = zfcp_fc_ns_handler;
	509	ct->handler_data = (unsigned long)&compl_rec;
cc8c2829 SS	510	ct->timeout = 10;
	511	ct->req = &gpn_ft->sg_req;
	512	ct->resp = gpn_ft->sg_resp;
	513	ct->req_count = 1;
	514	ct->resp_count = ZFCP_GPN_FT_BUFFERS;
	515
5ab944f9 SS	516	init_completion(&compl_rec.done);
5ab944f9 SS	517	compl_rec.handler = NULL;
cc8c2829 SS	518	ret = zfcp_fsf_send_ct(ct, NULL, NULL);
cc8c2829 SS	519	if (!ret)
5ab944f9	520	wait_for_completion(&compl_rec.done);
cc8c2829 SS	521	return ret;
	522	}
	523
	524	static void zfcp_validate_port(struct zfcp_port *port)
	525	{
	526	struct zfcp_adapter *adapter = port->adapter;
	527
	528	atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
	529
0406289e CS	530	if ((port->supported_classes != 0) \|\|
0406289e CS	531	!list_empty(&port->unit_list_head)) {
cc8c2829 SS	532	zfcp_port_put(port);
	533	return;
	534	}
	535	zfcp_erp_port_shutdown(port, 0, 151, NULL);
	536	zfcp_erp_wait(adapter);
	537	zfcp_port_put(port);
	538	zfcp_port_dequeue(port);
	539	}
	540
	541	static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft)
	542	{
	543	struct zfcp_send_ct *ct = &gpn_ft->ct;
	544	struct scatterlist *sg = gpn_ft->sg_resp;
	545	struct ct_hdr *hdr = sg_virt(sg);
	546	struct gpn_ft_resp_acc *acc = sg_virt(sg);
5ab944f9	547	struct zfcp_adapter *adapter = ct->wka_port->adapter;
cc8c2829 SS	548	struct zfcp_port port, tmp;
cc8c2829 SS	549	u32 d_id;
47f7bba5	550	int ret = 0, x, last = 0;
cc8c2829 SS	551
	552	if (ct->status)
	553	return -EIO;
	554
	555	if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) {
	556	if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD)
	557	return -EAGAIN; /* might be a temporary condition */
	558	return -EIO;
	559	}
	560
	561	if (hdr->max_res_size)
	562	return -E2BIG;
	563
	564	down(&zfcp_data.config_sema);
	565
	566	/* first entry is the header */
47f7bba5	567	for (x = 1; x < ZFCP_GPN_FT_MAX_ENTRIES && !last; x++) {
cc8c2829 SS	568	if (x % (ZFCP_GPN_FT_ENTRIES + 1))
	569	acc++;
	570	else
	571	acc = sg_virt(++sg);
	572
47f7bba5	573	last = acc->control & 0x80;
cc8c2829 SS	574	d_id = acc->port_id[0] << 16 \| acc->port_id[1] << 8 \|
	575	acc->port_id[2];
	576
5ab944f9 SS	577	/* don't attach ports with a well known address */
	578	if ((d_id & ZFCP_DID_WKA) == ZFCP_DID_WKA)
	579	continue;
cc8c2829	580	/* skip the adapter's port and known remote ports */
9528539c	581	if (acc->wwpn == fc_host_port_name(adapter->scsi_host))
cc8c2829	582	continue;
9528539c SS	583	port = zfcp_get_port_by_wwpn(adapter, acc->wwpn);
	584	if (port) {
	585	zfcp_port_get(port);
	586	continue;
	587	}
cc8c2829 SS	588
cc8c2829 SS	589	port = zfcp_port_enqueue(adapter, acc->wwpn,
cc8c2829	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	}