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path: root/drivers/scsi/libfc/fc_libfc.c
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Diffstat (limited to 'drivers/scsi/libfc/fc_libfc.c')
-rw-r--r--drivers/scsi/libfc/fc_libfc.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/drivers/scsi/libfc/fc_libfc.c b/drivers/scsi/libfc/fc_libfc.c
index 6a48c28..b773512 100644
--- a/drivers/scsi/libfc/fc_libfc.c
+++ b/drivers/scsi/libfc/fc_libfc.c
@@ -35,6 +35,27 @@ unsigned int fc_debug_logging;
module_param_named(debug_logging, fc_debug_logging, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
+DEFINE_MUTEX(fc_prov_mutex);
+static LIST_HEAD(fc_local_ports);
+struct blocking_notifier_head fc_lport_notifier_head =
+ BLOCKING_NOTIFIER_INIT(fc_lport_notifier_head);
+EXPORT_SYMBOL(fc_lport_notifier_head);
+
+/*
+ * Providers which primarily send requests and PRLIs.
+ */
+struct fc4_prov *fc_active_prov[FC_FC4_PROV_SIZE] = {
+ [0] = &fc_rport_t0_prov,
+ [FC_TYPE_FCP] = &fc_rport_fcp_init,
+};
+
+/*
+ * Providers which receive requests.
+ */
+struct fc4_prov *fc_passive_prov[FC_FC4_PROV_SIZE] = {
+ [FC_TYPE_ELS] = &fc_lport_els_prov,
+};
+
/**
* libfc_init() - Initialize libfc.ko
*/
@@ -210,3 +231,102 @@ void fc_fill_reply_hdr(struct fc_frame *fp, const struct fc_frame *in_fp,
fc_fill_hdr(fp, in_fp, r_ctl, FC_FCTL_RESP, 0, parm_offset);
}
EXPORT_SYMBOL(fc_fill_reply_hdr);
+
+/**
+ * fc_fc4_conf_lport_params() - Modify "service_params" of specified lport
+ * if there is service provider (target provider) registered with libfc
+ * for specified "fc_ft_type"
+ * @lport: Local port which service_params needs to be modified
+ * @type: FC-4 type, such as FC_TYPE_FCP
+ */
+void fc_fc4_conf_lport_params(struct fc_lport *lport, enum fc_fh_type type)
+{
+ struct fc4_prov *prov_entry;
+ BUG_ON(type >= FC_FC4_PROV_SIZE);
+ BUG_ON(!lport);
+ prov_entry = fc_passive_prov[type];
+ if (type == FC_TYPE_FCP) {
+ if (prov_entry && prov_entry->recv)
+ lport->service_params |= FCP_SPPF_TARG_FCN;
+ }
+}
+
+void fc_lport_iterate(void (*notify)(struct fc_lport *, void *), void *arg)
+{
+ struct fc_lport *lport;
+
+ mutex_lock(&fc_prov_mutex);
+ list_for_each_entry(lport, &fc_local_ports, lport_list)
+ notify(lport, arg);
+ mutex_unlock(&fc_prov_mutex);
+}
+EXPORT_SYMBOL(fc_lport_iterate);
+
+/**
+ * fc_fc4_register_provider() - register FC-4 upper-level provider.
+ * @type: FC-4 type, such as FC_TYPE_FCP
+ * @prov: structure describing provider including ops vector.
+ *
+ * Returns 0 on success, negative error otherwise.
+ */
+int fc_fc4_register_provider(enum fc_fh_type type, struct fc4_prov *prov)
+{
+ struct fc4_prov **prov_entry;
+ int ret = 0;
+
+ if (type >= FC_FC4_PROV_SIZE)
+ return -EINVAL;
+ mutex_lock(&fc_prov_mutex);
+ prov_entry = (prov->recv ? fc_passive_prov : fc_active_prov) + type;
+ if (*prov_entry)
+ ret = -EBUSY;
+ else
+ *prov_entry = prov;
+ mutex_unlock(&fc_prov_mutex);
+ return ret;
+}
+EXPORT_SYMBOL(fc_fc4_register_provider);
+
+/**
+ * fc_fc4_deregister_provider() - deregister FC-4 upper-level provider.
+ * @type: FC-4 type, such as FC_TYPE_FCP
+ * @prov: structure describing provider including ops vector.
+ */
+void fc_fc4_deregister_provider(enum fc_fh_type type, struct fc4_prov *prov)
+{
+ BUG_ON(type >= FC_FC4_PROV_SIZE);
+ mutex_lock(&fc_prov_mutex);
+ if (prov->recv)
+ rcu_assign_pointer(fc_passive_prov[type], NULL);
+ else
+ rcu_assign_pointer(fc_active_prov[type], NULL);
+ mutex_unlock(&fc_prov_mutex);
+ synchronize_rcu();
+}
+EXPORT_SYMBOL(fc_fc4_deregister_provider);
+
+/**
+ * fc_fc4_add_lport() - add new local port to list and run notifiers.
+ * @lport: The new local port.
+ */
+void fc_fc4_add_lport(struct fc_lport *lport)
+{
+ mutex_lock(&fc_prov_mutex);
+ list_add_tail(&lport->lport_list, &fc_local_ports);
+ blocking_notifier_call_chain(&fc_lport_notifier_head,
+ FC_LPORT_EV_ADD, lport);
+ mutex_unlock(&fc_prov_mutex);
+}
+
+/**
+ * fc_fc4_del_lport() - remove local port from list and run notifiers.
+ * @lport: The new local port.
+ */
+void fc_fc4_del_lport(struct fc_lport *lport)
+{
+ mutex_lock(&fc_prov_mutex);
+ list_del(&lport->lport_list);
+ blocking_notifier_call_chain(&fc_lport_notifier_head,
+ FC_LPORT_EV_DEL, lport);
+ mutex_unlock(&fc_prov_mutex);
+}