/*
* zfcp device driver
*
* Fibre Channel related functions for the zfcp device driver.
*
* Copyright IBM Corporation 2008
*/
#include "zfcp_ext.h"
static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
struct fcp_rscn_element *elem)
{
unsigned long flags;
struct zfcp_port *port;
read_lock_irqsave(&zfcp_data.config_lock, flags);
list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) {
if (atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
continue;
/* FIXME: ZFCP_STATUS_PORT_DID_DID check is racy */
if (!atomic_test_mask(ZFCP_STATUS_PORT_DID_DID, &port->status))
/* Try to connect to unused ports anyway. */
zfcp_erp_port_reopen(port,
ZFCP_STATUS_COMMON_ERP_FAILED,
82, fsf_req);
else if ((port->d_id & range) == (elem->nport_did & range))
/* Check connection status for connected ports */
zfcp_test_link(port);
}
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
}
static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
{
struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
struct fcp_rscn_head *fcp_rscn_head;
struct fcp_rscn_element *fcp_rscn_element;
u16 i;
u16 no_entries;
u32 range_mask;
fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
/* see FC-FS */
no_entries = fcp_rscn_head->payload_len /
sizeof(struct fcp_rscn_element);
for (i = 1; i < no_entries; i++) {
/* skip head and start with 1st element */
fcp_rscn_element++;
switch (fcp_rscn_element->addr_format) {
case ZFCP_PORT_ADDRESS:
range_mask = ZFCP_PORTS_RANGE_PORT;
break;
case ZFCP_AREA_ADDRESS:
range_mask = ZFCP_PORTS_RANGE_AREA;
break;
case ZFCP_DOMAIN_ADDRESS:
range_mask = ZFCP_PORTS_RANGE_DOMAIN;
break;
case ZFCP_FABRIC_ADDRESS:
range_mask = ZFCP_PORTS_RANGE_FABRIC;
break;
default:
continue;
}
_zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
}
}
static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, wwn_t wwpn)
{
struct zfcp_adapter *adapter = req->adapter;
struct zfcp_port *port;
unsigned long flags;
read_lock_irqsave(&zfcp_data.config_lock, flags);
list_for_each_entry(port, &adapter->port_list_head, list)
if (port->wwpn == wwpn)
break;
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
if (port && (port->wwpn == wwpn))
zfcp_erp_port_forced_reopen(port, 0, 83, req);
}
static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
{
struct fsf_status_read_buffer *status_buffer =
(struct fsf_status_read_buffer *)req->data;
struct fsf_plogi *els_plogi =
(struct fsf_plogi *) status_buffer->payload;
zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
}
static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
{
struct fsf_status_read_buffer *status_buffer =
(struct fsf_status_read_buffer *)req->data;
struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
}
/**
* zfcp_fc_incoming_els - handle incoming ELS
* @fsf_req - request which contains incoming ELS
*/
void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
{
struct fsf_status_read_buffer *status_buffer =
(struct fsf_status_read_buffer *) fsf_req->data;
unsigned int els_type = status_buffer->payload[0];
zfcp_san_dbf_event_incoming_els(fsf_req);
if (els_type == LS_PLOGI)
zfcp_fc_incoming_plogi(fsf_req);
else if (els_type == LS_LOGO)
zfcp_fc_incoming_logo(fsf_req);
else if (els_type == LS_RSCN)
zfcp_fc_incoming_rscn(fsf_req);
}
static void zfcp_ns_gid_pn_handler(unsigned long data)
{
struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data;
struct zfcp_send_ct *ct = &gid_pn->ct;
struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
struct zfcp_port *port = gid_pn->port;
if (ct->status)
goto out;
if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT) {
atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
goto out;
}
/* paranoia */
if (ct_iu_req->wwpn != port->wwpn)
goto out;
/* looks like a valid d_id */
port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
out:
mempool_free(gid_pn, port->adapter->pool.data_gid_pn);
}
/**
* zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
* @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
* return: -ENOMEM on error, 0 otherwise
*/
int zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
{
int ret;
struct zfcp_gid_pn_data *gid_pn;
struct zfcp_adapter *adapter = erp_action->adapter;
gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC);
if (!gid_pn)
return -ENOMEM;
memset(gid_pn, 0, sizeof(*gid_pn));
/* setup parameters for send generic command */
gid_pn->port = erp_action->port;
gid_pn->ct.port = adapter->nameserver_port;
gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
gid_pn->ct.handler_data = (unsigned long) gid_pn;
gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
gid_pn->ct.req = &gid_pn->req;
gid_pn->ct.resp = &gid_pn->resp;
gid_pn->ct.req_count = 1;
gid_pn->ct.resp_count = 1;
sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
sizeof(struct ct_iu_gid_pn_req));
sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
sizeof(struct ct_iu_gid_pn_resp));
/* setup nameserver request */
gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_MAX_SIZE;
gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;
ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
erp_action);
if (ret)
mempool_free(gid_pn, adapter->pool.data_gid_pn);
return ret;
}
/**
* zfcp_fc_plogi_evaluate - evaluate PLOGI playload
* @port: zfcp_port structure
* @plogi: plogi payload
*
* Evaluate PLOGI playload and copy important fields into zfcp_port structure
*/
void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
{
port->maxframe_size = plogi->serv_param.common_serv_param[7] |
((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
if (plogi->serv_param.class1_serv_param[0] & 0x80)
port->supported_classes |= FC_COS_CLASS1;
if (plogi->serv_param.class2_serv_param[0] & 0x80)
port->supported_classes |= FC_COS_CLASS2;
if (plogi->serv_param.class3_serv_param[0] & 0x80)
port->supported_classes |= FC_COS_CLASS3;
if (plogi->serv_param.class4_serv_param[0] & 0x80)
port->supported_classes |= FC_COS_CLASS4;
}
struct zfcp_els_adisc {
struct zfcp_send_els els;
struct scatterlist req;
struct scatterlist resp;
struct zfcp_ls_adisc ls_adisc;
struct zfcp_ls_adisc_acc ls_adisc_acc;
};
static void zfcp_fc_adisc_handler(unsigned long data)
{
struct zfcp_els_adisc *adisc = (struct zfcp_els_adisc *) data;
struct zfcp_port *port = adisc->els.port;
struct zfcp_ls_adisc_acc *ls_adisc = &adisc->ls_adisc_acc;
if (!adisc->els.status) {
/* request rejected or timed out */
zfcp_erp_port_forced_reopen(port, 0, 63, NULL);
goto out;
}
if (!port->wwnn)
port->wwnn = ls_adisc->wwnn;
if (port->wwpn != ls_adisc->wwpn)
zfcp_erp_port_reopen(port, 0, 64, NULL);
out:
zfcp_port_put(port);
kfree(adisc);
}
static int zfcp_fc_adisc(struct zfcp_port *port)
{
struct zfcp_els_adisc *adisc;
struct zfcp_adapter *adapter = port->adapter;
adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
if (!adisc)
return -ENOMEM;
adisc->els.req = &adisc->req;
adisc->els.resp = &adisc->resp;
sg_init_one(adisc->els.req, &adisc->ls_adisc,
sizeof(struct zfcp_ls_adisc));
sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
sizeof(struct zfcp_ls_adisc_acc));
adisc->els.req_count = 1;
adisc->els.resp_count = 1;
adisc->els.adapter = adapter;
adisc->els.port = port;
adisc->els.d_id = port->d_id;
adisc->els.handler = zfcp_fc_adisc_handler;
adisc->els.handler_data = (unsigned long) adisc;
adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;
/* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
without FC-AL-2 capability, so we don't set it */
adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);
return zfcp_fsf_send_els(&adisc->els);
}
/**
* zfcp_test_link - lightweight link test procedure
* @port: port to be tested
*
* Test status of a link to a remote port using the ELS command ADISC.
* If there is a problem with the remote port, error recovery steps
* will be triggered.
*/
void zfcp_test_link(struct zfcp_port *port)
{
int retval;
zfcp_port_get(port);
retval = zfcp_fc_adisc(port);
if (retval == 0 || retval == -EBUSY)
return;
/* send of ADISC was not possible */
zfcp_port_put(port);
zfcp_erp_port_forced_reopen(port, 0, 65, NULL);
}
