scsi: scsi_transport_fc: Add dummy initiator role to rport

This patch allows scsi drivers that expose virturalized fibre channel
devices but that do not expose rports to successfully rescan the scsi
bus via echo "- - -" > /sys/class/scsi_host/hostX/scan.  Drivers can
create a pseudo rport and indicate FC_PORT_ROLE_FCP_DUMMY_INITIATOR as
the rport's role in fc_rport_identifiers. This insures that a valid
scsi_target_id is assigned to the newly created rport and it can meet
the requirements of fc_user_scan_tgt calling scsi_scan_target.

Signed-off-by: Cathy Avery <cavery@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 87b8f9d..d4cf32d 100644 (file)
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -289,9 +289,10 @@ static const struct {
        u32                     value;
        char                    *name;
 } fc_port_role_names[] = {
-       { FC_PORT_ROLE_FCP_TARGET,      "FCP Target" },
-       { FC_PORT_ROLE_FCP_INITIATOR,   "FCP Initiator" },
-       { FC_PORT_ROLE_IP_PORT,         "IP Port" },
+       { FC_PORT_ROLE_FCP_TARGET,              "FCP Target" },
+       { FC_PORT_ROLE_FCP_INITIATOR,           "FCP Initiator" },
+       { FC_PORT_ROLE_IP_PORT,                 "IP Port" },
+       { FC_PORT_ROLE_FCP_DUMMY_INITIATOR,     "FCP Dummy Initiator" },
 };
 fc_bitfield_name_search(port_roles, fc_port_role_names)
 
@@ -2628,7 +2629,8 @@ fc_remote_port_create(struct Scsi_Host *shost, int channel,
        spin_lock_irqsave(shost->host_lock, flags);
 
        rport->number = fc_host->next_rport_number++;
-       if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
+       if ((rport->roles & FC_PORT_ROLE_FCP_TARGET) ||
+           (rport->roles & FC_PORT_ROLE_FCP_DUMMY_INITIATOR))
                rport->scsi_target_id = fc_host->next_target_id++;
        else
                rport->scsi_target_id = -1;

diff --git a/include/scsi/scsi_transport_fc.h b/include/scsi/scsi_transport_fc.h
index b21b8aa..6e208bb 100644 (file)
--- a/include/scsi/scsi_transport_fc.h
+++ b/include/scsi/scsi_transport_fc.h
@@ -162,6 +162,7 @@ enum fc_tgtid_binding_type  {
 #define FC_PORT_ROLE_FCP_TARGET                        0x01
 #define FC_PORT_ROLE_FCP_INITIATOR             0x02
 #define FC_PORT_ROLE_IP_PORT                   0x04
+#define FC_PORT_ROLE_FCP_DUMMY_INITIATOR       0x08
 
 /* The following are for compatibility */
 #define FC_RPORT_ROLE_UNKNOWN                  FC_PORT_ROLE_UNKNOWN