[SCSI] libfc: Add local port point-to-multipoint flag

For VN_port to VN_port mode, the transport sets the port_id and
there's no lport FLOGI.  This is similar to FC loop mode.

Add a point_to_multipoint flag that indicates the local port is in
point-to-multipoint mode.  This skips FLOGI and discovery.
It also skips resetting the port_id on resets other than link down.

Add function fc_lport_set_local_id() that sets the local port_id.
This is called by libfcoe on behalf of the low-level driver
to set the port_id when the link comes up.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 35 insertions, 1 deletions

diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c
index 79c9e3ccd341..f7bff2cad4ee 100644
--- a/drivers/scsi/libfc/fc_lport.c
+++ b/drivers/scsi/libfc/fc_lport.c
@@ -755,6 +755,34 @@ static void fc_lport_set_port_id(struct fc_lport *lport, u32 port_id,
 }
 
 /**
+ * fc_lport_set_port_id() - set the local port Port ID for point-to-multipoint
+ * @lport: The local port which will have its Port ID set.
+ * @port_id: The new port ID.
+ *
+ * Called by the lower-level driver when transport sets the local port_id.
+ * This is used in VN_port to VN_port mode for FCoE, and causes FLOGI and
+ * discovery to be skipped.
+ */
+void fc_lport_set_local_id(struct fc_lport *lport, u32 port_id)
+{
+        mutex_lock(&lport->lp_mutex);
+
+        fc_lport_set_port_id(lport, port_id, NULL);
+
+        switch (lport->state) {
+        case LPORT_ST_RESET:
+        case LPORT_ST_FLOGI:
+                if (port_id)
+                        fc_lport_enter_ready(lport);
+                break;
+        default:
+                break;
+        }
+        mutex_unlock(&lport->lp_mutex);
+}
+EXPORT_SYMBOL(fc_lport_set_local_id);
+
+/**
  * fc_lport_recv_flogi_req() - Receive a FLOGI request
  * @sp_in: The sequence the FLOGI is on
  * @rx_fp: The FLOGI frame
@@ -954,7 +982,7 @@ static void fc_lport_reset_locked(struct fc_lport *lport)
         lport->tt.exch_mgr_reset(lport, 0, 0);
         fc_host_fabric_name(lport->host) = 0;
 
-        if (lport->port_id)
+        if (lport->port_id && (!lport->point_to_multipoint || !lport->link_up))
                 fc_lport_set_port_id(lport, 0, NULL);
 }
 
@@ -1536,6 +1564,12 @@ void fc_lport_enter_flogi(struct fc_lport *lport)
 
         fc_lport_state_enter(lport, LPORT_ST_FLOGI);
 
+        if (lport->point_to_multipoint) {
+                if (lport->port_id)
+                        fc_lport_enter_ready(lport);
+                return;
+        }
+
         fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
         if (!fp)
                 return fc_lport_error(lport, fp);