[SCSI] fc_transport: Add an API to allow an LLD to create vports

There's already a fc_vport_termintate() call exported by
the transport.  This patch adds a symmetric call to the API to allow
an NPIV-capable LLD to instantiate vports sans user intervention.

Additional comments/updates:

   Re: scsi_fc_transport.txt
     Add a function prototype for fc_vport_terminate similar to what's
     done for fc_vport_create

   Re: fc_vport_create
     I recommend we pass the channel number in fc_vport_create rather
     than fixing it at zero.

     Also, ids->vport_type should be set to FC_PORTTYPE_NPIV prior to
     calling fc_vport_create. The comment is also meaningless.

Added-by and
Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/Documentation/scsi/scsi_fc_transport.txt b/Documentation/scsi/scsi_fc_transport.txt
index 75143f0c23b6..38d324d62b25 100644
--- a/Documentation/scsi/scsi_fc_transport.txt
+++ b/Documentation/scsi/scsi_fc_transport.txt
@@ -436,6 +436,42 @@ Other:
     was updated to remove all vports for the fc_host as well.
 
 
+Transport supplied functions
+----------------------------
+
+The following functions are supplied by the FC-transport for use by LLDs.
+
+   fc_vport_create - create a vport
+   fc_vport_terminate - detach and remove a vport
+
+Details:
+
+/**
+ * fc_vport_create - Admin App or LLDD requests creation of a vport
+ * @shost:     scsi host the virtual port is connected to.
+ * @ids:       The world wide names, FC4 port roles, etc for
+ *              the virtual port.
+ *
+ * Notes:
+ *     This routine assumes no locks are held on entry.
+ */
+struct fc_vport *
+fc_vport_create(struct Scsi_Host *shost, struct fc_vport_identifiers *ids)
+
+/**
+ * fc_vport_terminate - Admin App or LLDD requests termination of a vport
+ * @vport:      fc_vport to be terminated
+ *
+ * Calls the LLDD vport_delete() function, then deallocates and removes
+ * the vport from the shost and object tree.
+ *
+ * Notes:
+ *      This routine assumes no locks are held on entry.
+ */
+int
+fc_vport_terminate(struct fc_vport *vport)
+
+
 Credits
 =======
 The following people have contributed to this document: