Commit 8faecddb authored by Chris Leech's avatar Chris Leech Committed by James Bottomley
Browse files

[SCSI] libfc: vport link handling and fc_vport state managment 



NPIV vports are managed in libfc by changing their virtual link state
when the parent N_Ports internal state changes.  The vport link is only
online when the N_Port is in a ready state (logged into the fabric).

vport_state is updated as needed in this patch as well, currently the states
LINKDOWN, INITIALIZING, ACTIVE, DSIABLED, and NO_FABRIC_SUPP are used.

This also changes the fc_host port_state handling to differentiate between
LINKDOWN and OFFLINE.

Signed-off-by: default avatarChris Leech <christopher.leech@intel.com>
Signed-off-by: default avatarRobert Love <robert.w.love@intel.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
parent 174e1ebf

drivers/scsi/libfc/fc_lport.c

+57 −15
Original line number Diff line number Diff line
@@ -224,11 +224,19 @@ void fc_get_host_port_state(struct Scsi_Host *shost) 
{

	struct fc_lport *lp = shost_priv(shost);



	if (lp->link_up)

		fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;

	mutex_lock(&lp->lp_mutex);

	if (!lp->link_up)

		fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;

	else

		switch (lp->state) {

		case LPORT_ST_READY:

			fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;

			break;

		default:

			fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;

		}

	mutex_unlock(&lp->lp_mutex);

}

EXPORT_SYMBOL(fc_get_host_port_state);



void fc_get_host_speed(struct Scsi_Host *shost)
@@ -493,40 +501,62 @@ int fc_fabric_login(struct fc_lport *lport) 
EXPORT_SYMBOL(fc_fabric_login);



/**

 * fc_linkup() - Handler for transport linkup events

 * __fc_linkup() - Handler for transport linkup events

 * @lport: The lport whose link is up

 *

 * Locking: must be called with the lp_mutex held

 */

void fc_linkup(struct fc_lport *lport)

void __fc_linkup(struct fc_lport *lport)

{

	printk(KERN_INFO "libfc: Link up on port (%6x)\n",

	       fc_host_port_id(lport->host));



	mutex_lock(&lport->lp_mutex);

	if (!lport->link_up) {

		lport->link_up = 1;



		if (lport->state == LPORT_ST_RESET)

			fc_lport_enter_flogi(lport);

	}

}



/**

 * fc_linkup() - Handler for transport linkup events

 * @lport: The lport whose link is up

 */

void fc_linkup(struct fc_lport *lport)

{

	printk(KERN_INFO "libfc: Link up on port (%6x)\n",

	       fc_host_port_id(lport->host));



	mutex_lock(&lport->lp_mutex);

	__fc_linkup(lport);

	mutex_unlock(&lport->lp_mutex);

}

EXPORT_SYMBOL(fc_linkup);



/**

 * fc_linkdown() - Handler for transport linkdown events

 * __fc_linkdown() - Handler for transport linkdown events

 * @lport: The lport whose link is down

 *

 * Locking: must be called with the lp_mutex held

 */

void fc_linkdown(struct fc_lport *lport)

void __fc_linkdown(struct fc_lport *lport)

{

	mutex_lock(&lport->lp_mutex);

	printk(KERN_INFO "libfc: Link down on port (%6x)\n",

	       fc_host_port_id(lport->host));



	if (lport->link_up) {

		lport->link_up = 0;

		fc_lport_enter_reset(lport);

		lport->tt.fcp_cleanup(lport);

	}

}



/**

 * fc_linkdown() - Handler for transport linkdown events

 * @lport: The lport whose link is down

 */

void fc_linkdown(struct fc_lport *lport)

{

	printk(KERN_INFO "libfc: Link down on port (%6x)\n",

	       fc_host_port_id(lport->host));



	mutex_lock(&lport->lp_mutex);

	__fc_linkdown(lport);

	mutex_unlock(&lport->lp_mutex);

}

EXPORT_SYMBOL(fc_linkdown);
@@ -654,6 +684,9 @@ static void fc_lport_enter_ready(struct fc_lport *lport) 
		     fc_lport_state(lport));



	fc_lport_state_enter(lport, LPORT_ST_READY);

	if (lport->vport)

		fc_vport_set_state(lport->vport, FC_VPORT_ACTIVE);

	fc_vports_linkchange(lport);



	if (!lport->ptp_rp)

		lport->tt.disc_start(fc_lport_disc_callback, lport);
@@ -868,7 +901,14 @@ static void fc_lport_enter_reset(struct fc_lport *lport) 
	FC_LPORT_DBG(lport, "Entered RESET state from %s state\n",

		     fc_lport_state(lport));



	if (lport->vport) {

		if (lport->link_up)

			fc_vport_set_state(lport->vport, FC_VPORT_INITIALIZING);

		else

			fc_vport_set_state(lport->vport, FC_VPORT_LINKDOWN);

	}

	fc_lport_state_enter(lport, LPORT_ST_RESET);

	fc_vports_linkchange(lport);

	fc_lport_reset_locked(lport);

	if (lport->link_up)

		fc_lport_enter_flogi(lport);
@@ -887,6 +927,7 @@ static void fc_lport_enter_disabled(struct fc_lport *lport) 
		     fc_lport_state(lport));



	fc_lport_state_enter(lport, LPORT_ST_DISABLED);

	fc_vports_linkchange(lport);

	fc_lport_reset_locked(lport);

}
@@ -1333,6 +1374,7 @@ static void fc_lport_enter_logo(struct fc_lport *lport) 
		     fc_lport_state(lport));



	fc_lport_state_enter(lport, LPORT_ST_LOGO);

	fc_vports_linkchange(lport);



	fp = fc_frame_alloc(lport, sizeof(*logo));

	if (!fp) {

drivers/scsi/libfc/fc_npiv.c

+75 −0
Original line number Diff line number Diff line
@@ -84,3 +84,78 @@ struct fc_lport *fc_vport_id_lookup(struct fc_lport *n_port, u32 port_id) 
	return lport;

}



/*

 * When setting the link state of vports during an lport state change, it's

 * necessary to hold the lp_mutex of both the N_Port and the VN_Port.

 * This tells the lockdep engine to treat the nested locking of the VN_Port

 * as a different lock class.

 */

enum libfc_lport_mutex_class {

	LPORT_MUTEX_NORMAL = 0,

	LPORT_MUTEX_VN_PORT = 1,

};



/**

 * __fc_vport_setlink() - update link and status on a VN_Port

 * @n_port: parent N_Port

 * @vn_port: VN_Port to update

 *

 * Locking: must be called with both the N_Port and VN_Port lp_mutex held

 */

static void __fc_vport_setlink(struct fc_lport *n_port,

			       struct fc_lport *vn_port)

{

	struct fc_vport *vport = vn_port->vport;



	if (vn_port->state == LPORT_ST_DISABLED)

		return;



	if (n_port->state == LPORT_ST_READY) {

		if (n_port->npiv_enabled) {

			fc_vport_set_state(vport, FC_VPORT_INITIALIZING);

			__fc_linkup(vn_port);

		} else {

			fc_vport_set_state(vport, FC_VPORT_NO_FABRIC_SUPP);

			__fc_linkdown(vn_port);

		}

	} else {

		fc_vport_set_state(vport, FC_VPORT_LINKDOWN);

		__fc_linkdown(vn_port);

	}

}



/**

 * fc_vport_setlink() - update link and status on a VN_Port

 * @vn_port: virtual port to update

 */

void fc_vport_setlink(struct fc_lport *vn_port)

{

	struct fc_vport *vport = vn_port->vport;

	struct Scsi_Host *shost = vport_to_shost(vport);

	struct fc_lport *n_port = shost_priv(shost);



	mutex_lock(&n_port->lp_mutex);

	mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT);

	__fc_vport_setlink(n_port, vn_port);

	mutex_unlock(&vn_port->lp_mutex);

	mutex_unlock(&n_port->lp_mutex);

}

EXPORT_SYMBOL(fc_vport_setlink);



/**

 * fc_vports_linkchange() - change the link state of all vports

 * @n_port: Parent N_Port that has changed state

 *

 * Locking: called with the n_port lp_mutex held

 */

void fc_vports_linkchange(struct fc_lport *n_port)

{

	struct fc_lport *vn_port;



	list_for_each_entry(vn_port, &n_port->vports, list) {

		mutex_lock_nested(&vn_port->lp_mutex, LPORT_MUTEX_VN_PORT);

		__fc_vport_setlink(n_port, vn_port);

		mutex_unlock(&vn_port->lp_mutex);

	}

}

include/scsi/libfc.h

+8 −0
Original line number Diff line number Diff line
@@ -788,11 +788,13 @@ int fc_fabric_login(struct fc_lport *lp); 
/*

 * The link is up for the given local port.

 */

void __fc_linkup(struct fc_lport *);

void fc_linkup(struct fc_lport *);



/*

 * Link is down for the given local port.

 */

void __fc_linkdown(struct fc_lport *);

void fc_linkdown(struct fc_lport *);



/*
@@ -820,6 +822,12 @@ struct fc_lport *libfc_vport_create(struct fc_vport *vport, int privsize); 
 */

struct fc_lport *fc_vport_id_lookup(struct fc_lport *n_port, u32 port_id);



/*

 * NPIV VN_Port link state management

 */

void fc_vport_setlink(struct fc_lport *vn_port);

void fc_vports_linkchange(struct fc_lport *n_port);



/*

 * REMOTE PORT LAYER

 *****************************/

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