From 70d53b046a6221e3ceb3bd8eaa807ef6a1c53762 Mon Sep 17 00:00:00 2001 From: Joe Eykholt Date: Fri, 28 Jan 2011 16:04:18 -0800 Subject: [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 Signed-off-by: Robert Love Signed-off-by: James Bottomley --- drivers/scsi/libfc/fc_libfc.c | 41 +++++++++++++++++++++++++++++++++++++++++ drivers/scsi/libfc/fc_libfc.h | 2 ++ drivers/scsi/libfc/fc_lport.c | 2 ++ 3 files changed, 45 insertions(+) (limited to 'drivers/scsi/libfc') diff --git a/drivers/scsi/libfc/fc_libfc.c b/drivers/scsi/libfc/fc_libfc.c index ae3abef6523e..5e40dab8f919 100644 --- a/drivers/scsi/libfc/fc_libfc.c +++ b/drivers/scsi/libfc/fc_libfc.c @@ -36,6 +36,10 @@ 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. @@ -228,6 +232,17 @@ void fc_fill_reply_hdr(struct fc_frame *fp, const struct fc_frame *in_fp, } 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 @@ void fc_fc4_deregister_provider(enum fc_fh_type type, struct fc4_prov *prov) 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 205de285e456..8496f7020b97 100644 --- a/drivers/scsi/libfc/fc_libfc.h +++ b/drivers/scsi/libfc/fc_libfc.h @@ -123,6 +123,8 @@ void fc_destroy_fcp(void); * 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 e2cd087e71b2..e0ef81426c33 100644 --- a/drivers/scsi/libfc/fc_lport.c +++ b/drivers/scsi/libfc/fc_lport.c @@ -633,6 +633,7 @@ int fc_lport_destroy(struct fc_lport *lport) 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 @@ int fc_lport_init(struct fc_lport *lport) 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; } -- cgit v1.2.3-55-g7522