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Commit 70d53b04 authored by Joe Eykholt's avatar Joe Eykholt Committed by James Bottomley
Browse files

[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: default avatarJoe Eykholt <jeykholt@cisco.com>
Signed-off-by: default avatarRobert Love <robert.w.love@intel.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
parent baf9fdf0

drivers/scsi/libfc/fc_libfc.c

+41 −0
Original line number Diff line number Diff line
@@ -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);

}

drivers/scsi/libfc/fc_libfc.h

+2 −0
Original line number Diff line number Diff line
@@ -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

drivers/scsi/libfc/fc_lport.c

+2 −0
Original line number Diff line number Diff line
@@ -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;

}

include/scsi/libfc.h

+13 −1
Original line number Diff line number Diff line
@@ -763,6 +763,15 @@ struct fc_disc { 
			      enum fc_disc_event);

};



/*

 * Local port notifier and events.

 */

extern struct blocking_notifier_head fc_lport_notifier_head;

enum fc_lport_event {

	FC_LPORT_EV_ADD,

	FC_LPORT_EV_DEL,

};



/**

 * struct fc_lport - Local port

 * @host:                  The SCSI host associated with a local port
@@ -803,9 +812,10 @@ struct fc_disc { 
 * @lso_max:               The maximum large offload send size

 * @fcts:                  FC-4 type mask

 * @lp_mutex:              Mutex to protect the local port

 * @list:                  Handle for list of local ports

 * @list:                  Linkage on list of vport peers

 * @retry_work:            Handle to local port for delayed retry context

 * @prov:		   Pointers available for use by passive FC-4 providers

 * @lport_list:            Linkage on module-wide list of local ports

 */

struct fc_lport {

	/* Associations */
@@ -862,6 +872,7 @@ struct fc_lport { 
	struct list_head               list;

	struct delayed_work	       retry_work;

	void			       *prov[FC_FC4_PROV_SIZE];

	struct list_head               lport_list;

};



/**
@@ -1016,6 +1027,7 @@ struct fc_lport *libfc_vport_create(struct fc_vport *, int privsize); 
struct fc_lport *fc_vport_id_lookup(struct fc_lport *, u32 port_id);

int fc_lport_bsg_request(struct fc_bsg_job *);

void fc_lport_set_local_id(struct fc_lport *, u32 port_id);

void fc_lport_iterate(void (*func)(struct fc_lport *, void *), void *);



/*

 * REMOTE PORT LAYER