[fc] Send xfer_window_changed() when FCP link is established

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/include/ipxe/fc.h

@@ -455,6 +455,13 @@ struct fc_ulp_user {
 	struct fc_ulp *ulp;
 	/** List of users */
 	struct list_head list;
+	/** Containing object reference count, or NULL */
+	struct refcnt *refcnt;
+	/** Examine link state
+	 *
+	 * @v user		Fibre Channel upper-layer-protocol user
+	 */
+	void ( * examine ) ( struct fc_ulp_user *user );
 };
 
 /**
@@ -479,6 +486,43 @@ fc_ulp_put ( struct fc_ulp *ulp ) {
 	ref_put ( &ulp->refcnt );
 }
 
+/**
+ * Get reference to Fibre Channel upper-layer protocol user
+ *
+ * @v user		Fibre Channel upper-layer protocol user
+ * @ret user		Fibre Channel upper-layer protocol user
+ */
+static inline __attribute__ (( always_inline )) struct fc_ulp_user *
+fc_ulp_user_get ( struct fc_ulp_user *user ) {
+	ref_get ( user->refcnt );
+	return user;
+}
+
+/**
+ * Drop reference to Fibre Channel upper-layer protocol user
+ *
+ * @v user		Fibre Channel upper-layer protocol user
+ */
+static inline __attribute__ (( always_inline )) void
+fc_ulp_user_put ( struct fc_ulp_user *user ) {
+	ref_put ( user->refcnt );
+}
+
+/**
+ * Initialise Fibre Channel upper-layer protocol user
+ *
+ * @v user		Fibre Channel upper-layer protocol user
+ * @v examine		Examine link state method
+ * @v refcnt		Containing object reference count, or NULL
+ */
+static inline __attribute__ (( always_inline )) void
+fc_ulp_user_init ( struct fc_ulp_user *user,
+		   void ( * examine ) ( struct fc_ulp_user *user ),
+		   struct refcnt *refcnt ) {
+	user->examine = examine;
+	user->refcnt = refcnt;
+}
+
 extern struct fc_ulp * fc_ulp_get_wwn_type ( const struct fc_name *port_wwn,
 					     unsigned int type );
 extern struct fc_ulp *

src/net/fc.c

@@ -1651,6 +1651,8 @@ void fc_ulp_detach ( struct fc_ulp_user *user ) {
  */
 int fc_ulp_login ( struct fc_ulp *ulp, const void *param, size_t param_len,
 		   int originated ) {
+	struct fc_ulp_user *user;
+	struct fc_ulp_user *tmp;
 
 	/* Perform implicit logout if logged in and service parameters differ */
 	if ( fc_link_ok ( &ulp->link ) &&
@@ -1659,6 +1661,22 @@ int fc_ulp_login ( struct fc_ulp *ulp, const void *param, size_t param_len,
 		fc_ulp_logout ( ulp, 0 );
 	}
 
+	/* Work around a bug in some versions of the Linux Fibre
+	 * Channel stack, which fail to fully initialise image pairs
+	 * established via a PRLI originated by the Linux stack
+	 * itself.
+	 */
+	if ( originated )
+		ulp->flags |= FC_ULP_ORIGINATED_LOGIN_OK;
+	if ( ! ( ulp->flags & FC_ULP_ORIGINATED_LOGIN_OK ) ) {
+		DBGC ( ulp, "FCULP %s/%02x sending extra PRLI to work around "
+		       "Linux bug\n",
+		       fc_ntoa ( &ulp->peer->port_wwn ), ulp->type );
+		fc_link_stop ( &ulp->link );
+		fc_link_start ( &ulp->link );
+		return 0;
+	}
+
 	/* Log in, if applicable */
 	if ( ! fc_link_ok ( &ulp->link ) ) {
 
@@ -1685,18 +1703,11 @@ int fc_ulp_login ( struct fc_ulp *ulp, const void *param, size_t param_len,
 	/* Record login */
 	fc_link_up ( &ulp->link );
 
-	/* Work around a bug in some versions of the Linux Fibre
-	 * Channel stack, which fail to fully initialise image pairs
-	 * established via a PRLI originated by the Linux stack
-	 * itself.
-	 */
-	if ( originated )
-		ulp->flags |= FC_ULP_ORIGINATED_LOGIN_OK;
-	if ( ! ( ulp->flags & FC_ULP_ORIGINATED_LOGIN_OK ) ) {
-		DBGC ( ulp, "FCULP %s/%02x sending extra PRLI to work around "
-		       "Linux bug\n",
-		       fc_ntoa ( &ulp->peer->port_wwn ), ulp->type );
-		fc_link_start ( &ulp->link );
+	/* Notify users of link state change */
+	list_for_each_entry_safe ( user, tmp, &ulp->users, list ) {
+		fc_ulp_user_get ( user );
+		user->examine ( user );
+		fc_ulp_user_put ( user );
 	}
 
 	return 0;
@@ -1709,6 +1720,8 @@ int fc_ulp_login ( struct fc_ulp *ulp, const void *param, size_t param_len,
  * @v rc		Reason for logout
  */
 void fc_ulp_logout ( struct fc_ulp *ulp, int rc ) {
+	struct fc_ulp_user *user;
+	struct fc_ulp_user *tmp;
 
 	DBGC ( ulp, "FCULP %s/%02x logged out: %s\n",
 	       fc_ntoa ( &ulp->peer->port_wwn ), ulp->type, strerror ( rc ) );
@@ -1726,6 +1739,13 @@ void fc_ulp_logout ( struct fc_ulp *ulp, int rc ) {
 	/* Record logout */
 	fc_link_err ( &ulp->link, rc );
 
+	/* Notify users of link state change */
+	list_for_each_entry_safe ( user, tmp, &ulp->users, list ) {
+		fc_ulp_user_get ( user );
+		user->examine ( user );
+		fc_ulp_user_put ( user );
+	}
+
 	/* Close ULP if there are no clients attached */
 	if ( list_empty ( &ulp->users ) )
 		fc_ulp_close ( ulp, rc );

src/net/fcp.c

@@ -920,6 +920,26 @@ static struct interface_operation fcpdev_scsi_op[] = {
 static struct interface_descriptor fcpdev_scsi_desc =
 	INTF_DESC ( struct fcp_device, scsi, fcpdev_scsi_op );
 
+/**
+ * Examine FCP ULP link state
+ *
+ * @v user		Fibre Channel upper-layer protocol user
+ */
+static void fcpdev_examine ( struct fc_ulp_user *user ) {
+	struct fcp_device *fcpdev =
+		container_of ( user, struct fcp_device, user );
+
+	if ( fc_link_ok ( &fcpdev->user.ulp->link ) ) {
+		DBGC ( fcpdev, "FCP %p link is up\n", fcpdev );
+	} else {
+		DBGC ( fcpdev, "FCP %p link is down: %s\n",
+		       fcpdev, strerror ( fcpdev->user.ulp->link.rc ) );
+	}
+
+	/* Notify SCSI layer of window change */
+	xfer_window_changed ( &fcpdev->scsi );
+}
+
 /**
  * Open FCP device
  *
@@ -950,10 +970,13 @@ static int fcpdev_open ( struct interface *parent, struct fc_name *wwn,
 	ref_init ( &fcpdev->refcnt, NULL );
 	intf_init ( &fcpdev->scsi, &fcpdev_scsi_desc, &fcpdev->refcnt );
 	INIT_LIST_HEAD ( &fcpdev->fcpcmds );
-	fc_ulp_attach ( ulp, &fcpdev->user );
+	fc_ulp_user_init ( &fcpdev->user, fcpdev_examine, &fcpdev->refcnt );
 
 	DBGC ( fcpdev, "FCP %p opened for %s\n", fcpdev, fc_ntoa ( wwn ) );
 
+	/* Attach to Fibre Channel ULP */
+	fc_ulp_attach ( ulp, &fcpdev->user );
+
 	/* Preserve parameters required for boot firmware table */
 	memcpy ( &fcpdev->wwn, wwn, sizeof ( fcpdev->wwn ) );
 	memcpy ( &fcpdev->lun, lun, sizeof ( fcpdev->lun ) );