[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];
};

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

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);
}

static int zfcp_scan_get_nameserver(struct zfcp_adapter *adapter)
{
	int ret;

	if (!adapter->nameserver_port)
		return -EINTR;

	if (!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
			       &adapter->nameserver_port->status)) {
		ret = zfcp_erp_port_reopen(adapter->nameserver_port, 0, 148,
					   NULL);
		if (ret)
			return ret;
		zfcp_erp_wait(adapter);
		zfcp_port_put(adapter->nameserver_port);
	}
	return !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
				  &adapter->nameserver_port->status);
}

static void zfcp_gpn_ft_handler(unsigned long _done)
{
	complete((struct completion *)_done);
}

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 completion done;
	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->port = adapter->nameserver_port;
	ct->handler = zfcp_gpn_ft_handler;
	ct->handler_data = (unsigned long)&done;
	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(&done);
	ret = zfcp_fsf_send_ct(ct, NULL, NULL);
	if (!ret)
		wait_for_completion(&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 == adapter->nameserver_port)
		return;
	if ((port->supported_classes != 0) || (port->units != 0)) {
		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->port->adapter;
	struct zfcp_port *port, *tmp;
	u32 d_id;
	int ret = 0, x;

	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; x++) {
		if (x % (ZFCP_GPN_FT_ENTRIES + 1))
			acc++;
		else
			acc = sg_virt(++sg);

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

		/* skip the adapter's port and known remote ports */
		if (acc->wwpn == fc_host_port_name(adapter->scsi_host) ||
		     zfcp_get_port_by_did(adapter, d_id))
			continue;

		port = zfcp_port_enqueue(adapter, acc->wwpn,
					 ZFCP_STATUS_PORT_DID_DID |
					 ZFCP_STATUS_COMMON_NOESC, d_id);
		if (port)
			zfcp_erp_port_reopen(port, 0, 149, NULL);
		else
			ret = -ENOMEM;
		if (acc->control & 0x80) /* last entry */
			break;
	}

	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;

	zfcp_erp_wait(adapter); /* wait until adapter is finished with ERP */
	if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT)
		return 0;

	ret = zfcp_scan_get_nameserver(adapter);
	if (ret)
		return ret;

	gpn_ft = zfcp_alloc_sg_env();
	if (!gpn_ft)
		return -ENOMEM;

	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);

	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
24073b47 CS	42	static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
	43	struct fcp_rscn_element *elem)
	44	{
	45	unsigned long flags;
	46	struct zfcp_port *port;
	47
	48	read_lock_irqsave(&zfcp_data.config_lock, flags);
	49	list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) {
	50	if (atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
	51	continue;
	52	/* FIXME: ZFCP_STATUS_PORT_DID_DID check is racy */
	53	if (!atomic_test_mask(ZFCP_STATUS_PORT_DID_DID, &port->status))
	54	/* Try to connect to unused ports anyway. */
	55	zfcp_erp_port_reopen(port,
	56	ZFCP_STATUS_COMMON_ERP_FAILED,
	57	82, fsf_req);
	58	else if ((port->d_id & range) == (elem->nport_did & range))
	59	/* Check connection status for connected ports */
	60	zfcp_test_link(port);
	61	}
	62	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
	63	}
	64
	65	static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
	66	{
	67	struct fsf_status_read_buffer status_buffer = (void )fsf_req->data;
	68	struct fcp_rscn_head *fcp_rscn_head;
	69	struct fcp_rscn_element *fcp_rscn_element;
	70	u16 i;
	71	u16 no_entries;
	72	u32 range_mask;
	73
	74	fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
	75	fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
	76
	77	/* see FC-FS */
	78	no_entries = fcp_rscn_head->payload_len /
	79	sizeof(struct fcp_rscn_element);
	80
	81	for (i = 1; i < no_entries; i++) {
	82	/* skip head and start with 1st element */
	83	fcp_rscn_element++;
	84	switch (fcp_rscn_element->addr_format) {
	85	case ZFCP_PORT_ADDRESS:
	86	range_mask = ZFCP_PORTS_RANGE_PORT;
	87	break;
	88	case ZFCP_AREA_ADDRESS:
	89	range_mask = ZFCP_PORTS_RANGE_AREA;
	90	break;
	91	case ZFCP_DOMAIN_ADDRESS:
	92	range_mask = ZFCP_PORTS_RANGE_DOMAIN;
	93	break;
	94	case ZFCP_FABRIC_ADDRESS:
	95	range_mask = ZFCP_PORTS_RANGE_FABRIC;
	96	break;
	97	default:
	98	continue;
	99	}
	100	_zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
	101	}
cc8c2829	102	schedule_work(&fsf_req->adapter->scan_work);
24073b47 CS	103	}
	104
	105	static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, wwn_t wwpn)
	106	{
	107	struct zfcp_adapter *adapter = req->adapter;
	108	struct zfcp_port *port;
	109	unsigned long flags;
	110
	111	read_lock_irqsave(&zfcp_data.config_lock, flags);
	112	list_for_each_entry(port, &adapter->port_list_head, list)
	113	if (port->wwpn == wwpn)
	114	break;
	115	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
	116
	117	if (port && (port->wwpn == wwpn))
	118	zfcp_erp_port_forced_reopen(port, 0, 83, req);
	119	}
	120
	121	static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
	122	{
	123	struct fsf_status_read_buffer *status_buffer =
	124	(struct fsf_status_read_buffer *)req->data;
	125	struct fsf_plogi *els_plogi =
	126	(struct fsf_plogi *) status_buffer->payload;
	127
	128	zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
	129	}
	130
	131	static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
	132	{
	133	struct fsf_status_read_buffer *status_buffer =
	134	(struct fsf_status_read_buffer *)req->data;
	135	struct fcp_logo els_logo = (struct fcp_logo ) status_buffer->payload;
	136
	137	zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
	138	}
	139
	140	/**
	141	* zfcp_fc_incoming_els - handle incoming ELS
	142	* @fsf_req - request which contains incoming ELS
	143	*/
	144	void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
	145	{
	146	struct fsf_status_read_buffer *status_buffer =
	147	(struct fsf_status_read_buffer *) fsf_req->data;
	148	unsigned int els_type = status_buffer->payload[0];
	149
	150	zfcp_san_dbf_event_incoming_els(fsf_req);
	151	if (els_type == LS_PLOGI)
	152	zfcp_fc_incoming_plogi(fsf_req);
	153	else if (els_type == LS_LOGO)
	154	zfcp_fc_incoming_logo(fsf_req);
	155	else if (els_type == LS_RSCN)
	156	zfcp_fc_incoming_rscn(fsf_req);
	157	}
	158
	159	static void zfcp_ns_gid_pn_handler(unsigned long data)
	160	{
	161	struct zfcp_gid_pn_data gid_pn = (struct zfcp_gid_pn_data ) data;
	162	struct zfcp_send_ct *ct = &gid_pn->ct;
	163	struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
	164	struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
	165	struct zfcp_port *port = gid_pn->port;
	166
167	if (ct->status)
168	goto out;
169	if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT) {
170	atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
171	goto out;
172	}
173	/* paranoia */
174	if (ct_iu_req->wwpn != port->wwpn)
175	goto out;
176	/* looks like a valid d_id */
177	port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
178	atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
179	out:
180	mempool_free(gid_pn, port->adapter->pool.data_gid_pn);
181	}
182
183	/**
184	* zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
185	* @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
186	* return: -ENOMEM on error, 0 otherwise
187	*/
188	int zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
189	{
190	int ret;
191	struct zfcp_gid_pn_data *gid_pn;
192	struct zfcp_adapter *adapter = erp_action->adapter;
193
194	gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC);
195	if (!gid_pn)
196	return -ENOMEM;
197
198	memset(gid_pn, 0, sizeof(*gid_pn));
199
200	/* setup parameters for send generic command */
201	gid_pn->port = erp_action->port;
202	gid_pn->ct.port = adapter->nameserver_port;
203	gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
204	gid_pn->ct.handler_data = (unsigned long) gid_pn;
205	gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
206	gid_pn->ct.req = &gid_pn->req;
207	gid_pn->ct.resp = &gid_pn->resp;
208	gid_pn->ct.req_count = 1;
209	gid_pn->ct.resp_count = 1;
210	sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
211	sizeof(struct ct_iu_gid_pn_req));
212	sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
213	sizeof(struct ct_iu_gid_pn_resp));
214
215	/* setup nameserver request */
216	gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
217	gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
218	gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
219	gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
220	gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
221	gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_MAX_SIZE;
222	gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;
223
224	ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
225	erp_action);
226	if (ret)
227	mempool_free(gid_pn, adapter->pool.data_gid_pn);
228	return ret;
229	}
230
231	/**
232	* zfcp_fc_plogi_evaluate - evaluate PLOGI playload
233	* @port: zfcp_port structure
234	* @plogi: plogi payload
235	*
236	* Evaluate PLOGI playload and copy important fields into zfcp_port structure
237	*/
238	void zfcp_fc_plogi_evaluate(struct zfcp_port port, struct fsf_plogi plogi)
239	{
240	port->maxframe_size = plogi->serv_param.common_serv_param[7] \|
241	((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
242	if (plogi->serv_param.class1_serv_param[0] & 0x80)
243	port->supported_classes \|= FC_COS_CLASS1;
244	if (plogi->serv_param.class2_serv_param[0] & 0x80)
245	port->supported_classes \|= FC_COS_CLASS2;
246	if (plogi->serv_param.class3_serv_param[0] & 0x80)
247	port->supported_classes \|= FC_COS_CLASS3;
248	if (plogi->serv_param.class4_serv_param[0] & 0x80)
249	port->supported_classes \|= FC_COS_CLASS4;
250	}
251
252	struct zfcp_els_adisc {
253	struct zfcp_send_els els;
254	struct scatterlist req;
255	struct scatterlist resp;
256	struct zfcp_ls_adisc ls_adisc;
257	struct zfcp_ls_adisc_acc ls_adisc_acc;
258	};
259
260	static void zfcp_fc_adisc_handler(unsigned long data)
261	{
262	struct zfcp_els_adisc adisc = (struct zfcp_els_adisc ) data;
263	struct zfcp_port *port = adisc->els.port;
264	struct zfcp_ls_adisc_acc *ls_adisc = &adisc->ls_adisc_acc;
265
266	if (!adisc->els.status) {
267	/* request rejected or timed out */
268	zfcp_erp_port_forced_reopen(port, 0, 63, NULL);
269	goto out;
270	}
271
272	if (!port->wwnn)
273	port->wwnn = ls_adisc->wwnn;
274
275	if (port->wwpn != ls_adisc->wwpn)
276	zfcp_erp_port_reopen(port, 0, 64, NULL);
277
278	out:
279	zfcp_port_put(port);
280	kfree(adisc);
281	}
282
283	static int zfcp_fc_adisc(struct zfcp_port *port)
284	{
285	struct zfcp_els_adisc *adisc;
286	struct zfcp_adapter *adapter = port->adapter;
287
288	adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
289	if (!adisc)
290	return -ENOMEM;
291
292	adisc->els.req = &adisc->req;
293	adisc->els.resp = &adisc->resp;
294	sg_init_one(adisc->els.req, &adisc->ls_adisc,
295	sizeof(struct zfcp_ls_adisc));
296	sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
297	sizeof(struct zfcp_ls_adisc_acc));
298
299	adisc->els.req_count = 1;
300	adisc->els.resp_count = 1;
301	adisc->els.adapter = adapter;
302	adisc->els.port = port;
303	adisc->els.d_id = port->d_id;
304	adisc->els.handler = zfcp_fc_adisc_handler;
305	adisc->els.handler_data = (unsigned long) adisc;
306	adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;
307
308	/* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
309	without FC-AL-2 capability, so we don't set it */
310	adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
311	adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
312	adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);
313
314	return zfcp_fsf_send_els(&adisc->els);
315	}
316
317	/**
318	* zfcp_test_link - lightweight link test procedure
319	* @port: port to be tested
320	*
321	* Test status of a link to a remote port using the ELS command ADISC.
322	* If there is a problem with the remote port, error recovery steps
323	* will be triggered.
324	*/
325	void zfcp_test_link(struct zfcp_port *port)
326	{
327	int retval;
328
329	zfcp_port_get(port);
330	retval = zfcp_fc_adisc(port);
331	if (retval == 0 \|\| retval == -EBUSY)
332	return;
333
334	/* send of ADISC was not possible */
335	zfcp_port_put(port);
336	zfcp_erp_port_forced_reopen(port, 0, 65, NULL);
337	}
cc8c2829 SS	338
	339	static int zfcp_scan_get_nameserver(struct zfcp_adapter *adapter)
	340	{
	341	int ret;
	342
	343	if (!adapter->nameserver_port)
	344	return -EINTR;
	345
	346	if (!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
	347	&adapter->nameserver_port->status)) {
	348	ret = zfcp_erp_port_reopen(adapter->nameserver_port, 0, 148,
	349	NULL);
	350	if (ret)
	351	return ret;
	352	zfcp_erp_wait(adapter);
	353	zfcp_port_put(adapter->nameserver_port);
	354	}
	355	return !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
	356	&adapter->nameserver_port->status);
	357	}
	358
	359	static void zfcp_gpn_ft_handler(unsigned long _done)
	360	{
	361	complete((struct completion *)_done);
	362	}
	363
	364	static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft)
	365	{
	366	struct scatterlist *sg = &gpn_ft->sg_req;
	367
	368	kfree(sg_virt(sg)); /* free request buffer */
	369	zfcp_sg_free_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS);
	370
	371	kfree(gpn_ft);
	372	}
	373
	374	static struct zfcp_gpn_ft *zfcp_alloc_sg_env(void)
	375	{
	376	struct zfcp_gpn_ft *gpn_ft;
	377	struct ct_iu_gpn_ft_req *req;
	378
	379	gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
	380	if (!gpn_ft)
	381	return NULL;
	382
	383	req = kzalloc(sizeof(struct ct_iu_gpn_ft_req), GFP_KERNEL);
	384	if (!req) {
	385	kfree(gpn_ft);
	386	gpn_ft = NULL;
	387	goto out;
	388	}
	389	sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));
	390
	391	if (zfcp_sg_setup_table(gpn_ft->sg_resp, ZFCP_GPN_FT_BUFFERS)) {
	392	zfcp_free_sg_env(gpn_ft);
	393	gpn_ft = NULL;
	394	}
	395	out:
	396	return gpn_ft;
	397	}
	398
	399
	400	static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft,
	401	struct zfcp_adapter *adapter)
402	{
403	struct zfcp_send_ct *ct = &gpn_ft->ct;
404	struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
405	struct completion done;
406	int ret;
407
408	/* prepare CT IU for GPN_FT */
409	req->header.revision = ZFCP_CT_REVISION;
410	req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
411	req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
412	req->header.options = ZFCP_CT_SYNCHRONOUS;
413	req->header.cmd_rsp_code = ZFCP_CT_GPN_FT;
414	req->header.max_res_size = (sizeof(struct gpn_ft_resp_acc) *
415	(ZFCP_GPN_FT_MAX_ENTRIES - 1)) >> 2;
416	req->flags = 0;
417	req->domain_id_scope = 0;
418	req->area_id_scope = 0;
419	req->fc4_type = ZFCP_CT_SCSI_FCP;
420
421	/* prepare zfcp_send_ct */
422	ct->port = adapter->nameserver_port;
423	ct->handler = zfcp_gpn_ft_handler;
424	ct->handler_data = (unsigned long)&done;
425	ct->timeout = 10;
426	ct->req = &gpn_ft->sg_req;
427	ct->resp = gpn_ft->sg_resp;
428	ct->req_count = 1;
429	ct->resp_count = ZFCP_GPN_FT_BUFFERS;
430
431	init_completion(&done);
432	ret = zfcp_fsf_send_ct(ct, NULL, NULL);
433	if (!ret)
434	wait_for_completion(&done);
435	return ret;
436	}
437
438	static void zfcp_validate_port(struct zfcp_port *port)
439	{
440	struct zfcp_adapter *adapter = port->adapter;
441
442	atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
443
444	if (port == adapter->nameserver_port)
445	return;
446	if ((port->supported_classes != 0) \|\| (port->units != 0)) {
447	zfcp_port_put(port);
448	return;
449	}
450	zfcp_erp_port_shutdown(port, 0, 151, NULL);
451	zfcp_erp_wait(adapter);
452	zfcp_port_put(port);
453	zfcp_port_dequeue(port);
454	}
455
456	static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft)
457	{
458	struct zfcp_send_ct *ct = &gpn_ft->ct;
459	struct scatterlist *sg = gpn_ft->sg_resp;
460	struct ct_hdr *hdr = sg_virt(sg);
461	struct gpn_ft_resp_acc *acc = sg_virt(sg);
462	struct zfcp_adapter *adapter = ct->port->adapter;
463	struct zfcp_port port, tmp;
464	u32 d_id;
465	int ret = 0, x;
466
467	if (ct->status)
468	return -EIO;
469
470	if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) {
471	if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD)
472	return -EAGAIN; /* might be a temporary condition */
473	return -EIO;
474	}
475
476	if (hdr->max_res_size)
477	return -E2BIG;
478
479	down(&zfcp_data.config_sema);
480
481	/* first entry is the header */
482	for (x = 1; x < ZFCP_GPN_FT_MAX_ENTRIES; x++) {
483	if (x % (ZFCP_GPN_FT_ENTRIES + 1))
484	acc++;
485	else
486	acc = sg_virt(++sg);
487
488	d_id = acc->port_id[0] << 16 \| acc->port_id[1] << 8 \|
489	acc->port_id[2];
490
491	/* skip the adapter's port and known remote ports */
492	if (acc->wwpn == fc_host_port_name(adapter->scsi_host) \|\|
493	zfcp_get_port_by_did(adapter, d_id))
494	continue;
495
496	port = zfcp_port_enqueue(adapter, acc->wwpn,
497	ZFCP_STATUS_PORT_DID_DID \|
498	ZFCP_STATUS_COMMON_NOESC, d_id);
499	if (port)
500	zfcp_erp_port_reopen(port, 0, 149, NULL);
501	else
502	ret = -ENOMEM;
503	if (acc->control & 0x80) /* last entry */
504	break;
505	}
506
507	zfcp_erp_wait(adapter);
508	list_for_each_entry_safe(port, tmp, &adapter->port_list_head, list)
509	zfcp_validate_port(port);
510	up(&zfcp_data.config_sema);
511	return ret;
512	}
513
514	/**
515	* zfcp_scan_ports - scan remote ports and attach new ports
516	* @adapter: pointer to struct zfcp_adapter
517	*/
518	int zfcp_scan_ports(struct zfcp_adapter *adapter)
519	{
520	int ret, i;
521	struct zfcp_gpn_ft *gpn_ft;
522
c57a39a4	523	zfcp_erp_wait(adapter); /* wait until adapter is finished with ERP */
cc8c2829 SS	524	if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT)
	525	return 0;
	526
	527	ret = zfcp_scan_get_nameserver(adapter);
	528	if (ret)
	529	return ret;
	530
	531	gpn_ft = zfcp_alloc_sg_env();
	532	if (!gpn_ft)
	533	return -ENOMEM;
	534
	535	for (i = 0; i < 3; i++) {
	536	ret = zfcp_scan_issue_gpn_ft(gpn_ft, adapter);
	537	if (!ret) {
	538	ret = zfcp_scan_eval_gpn_ft(gpn_ft);
	539	if (ret == -EAGAIN)
	540	ssleep(1);
	541	else
	542	break;
	543	}
	544	}
	545	zfcp_free_sg_env(gpn_ft);
	546
	547	return ret;
	548	}
	549
	550
	551	void _zfcp_scan_ports_later(struct work_struct *work)
	552	{
	553	zfcp_scan_ports(container_of(work, struct zfcp_adapter, scan_work));
	554	}