[SCSI] zfcp: Allow midlayer to scan for LUNs when running in NPIV mode

Enable the LUN scanning mechanism in the SCSI midlayer:
- Do not set the disable_target_scan bit in the FC transport class.
- Set max_lun to 0xFFFFFFFF to allow the midlayer scan to include
  the two-level hierachical LUNs (like 0x40XX40XX00000000, but in SCSI
  midlayer LUN format).
- Set max_id to a high value to allow triggering the SCSI device
  rescan from sysfs.

When running in NPIV mode, zfcp accepts all LUNs in slave_attach. When
running in non-NPIV mode, the list of zfcp_unit structs determines
which SCSI devices are allowed on the current system.

Reviewed-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
index bc7217b88989..1e8d0cc7e1df 100644
--- a/drivers/s390/scsi/zfcp_scsi.c
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -143,7 +143,8 @@ static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
         if (unit)
                 put_device(&unit->dev);
-        else {
+
+        if (!unit && !(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) {
                 put_device(&port->dev);
                 return -ENXIO;
         }
@@ -309,8 +310,8 @@ int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
         }
 
         /* tell the SCSI stack some characteristics of this adapter */
-        adapter->scsi_host->max_id = 1;
-        adapter->scsi_host->max_lun = 1;
+        adapter->scsi_host->max_id = 511;
+        adapter->scsi_host->max_lun = 0xFFFFFFFF;
         adapter->scsi_host->max_channel = 0;
         adapter->scsi_host->unique_id = dev_id.devno;
         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
@@ -687,7 +688,6 @@ struct fc_function_template zfcp_transport_functions = {
         .show_host_port_type = 1,
         .show_host_speed = 1,
         .show_host_port_id = 1,
-        .disable_target_scan = 1,
         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 };