[SCSI] libfc: add hook to notify providers of local port changes
When an SCST provider is registered, it needs to know what
local ports are available for configuration as targets.
Add a notifier chain that is invoked when any local port
that is added or deleted.
Maintain a global list of local ports and add an
interator function that calls a given function for
every existing local port. This is used when first
loading a provider.
Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/libfc/fc_libfc.c b/drivers/scsi/libfc/fc_libfc.c
index ae3abef..5e40dab 100644
--- a/drivers/scsi/libfc/fc_libfc.c
+++ b/drivers/scsi/libfc/fc_libfc.c
@@ -36,6 +36,10 @@
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.
@@ -228,6 +232,17 @@
}
EXPORT_SYMBOL(fc_fill_reply_hdr);
+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
@@ -270,3 +285,29 @@
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);
+}
diff --git a/drivers/scsi/libfc/fc_libfc.h b/drivers/scsi/libfc/fc_libfc.h
index 205de28..8496f70 100644
--- a/drivers/scsi/libfc/fc_libfc.h
+++ b/drivers/scsi/libfc/fc_libfc.h
@@ -123,6 +123,8 @@
* Internal libfc functions
*/
const char *fc_els_resp_type(struct fc_frame *);
+extern void fc_fc4_add_lport(struct fc_lport *);
+extern void fc_fc4_del_lport(struct fc_lport *);
/*
* Copies a buffer into an sg list
diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c
index e2cd087..e0ef814 100644
--- a/drivers/scsi/libfc/fc_lport.c
+++ b/drivers/scsi/libfc/fc_lport.c
@@ -633,6 +633,7 @@
lport->tt.fcp_abort_io(lport);
lport->tt.disc_stop_final(lport);
lport->tt.exch_mgr_reset(lport, 0, 0);
+ fc_fc4_del_lport(lport);
return 0;
}
EXPORT_SYMBOL(fc_lport_destroy);
@@ -1633,6 +1634,7 @@
fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT;
if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT)
fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT;
+ fc_fc4_add_lport(lport);
return 0;
}