[SCSI] mpt2sas: Enable TLR for SSP TAPE drives (Added SAS Transport APIs)

If TLR is supported for end device, MPT2SAS driver will enable the TLR
bit in the SCSI_IO for every request. If there is a response with
MPI2_SCSITASKMGMT_RSP_INVALID_FRAME, the driver will turn off the TLR
logic.

[jejb: updated to new transport class TLR API]
Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Reviewed-by: Eric Moore <Eric.moore@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index ca984cb..344a22a 100644 (file)
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -1309,7 +1309,6 @@ _scsih_slave_alloc(struct scsi_device *sdev)
        struct MPT2SAS_DEVICE *sas_device_priv_data;
        struct scsi_target *starget;
        struct _raid_device *raid_device;
-       struct _sas_device *sas_device;
        unsigned long flags;
 
        sas_device_priv_data = kzalloc(sizeof(struct scsi_device), GFP_KERNEL);
@@ -1336,21 +1335,8 @@ _scsih_slave_alloc(struct scsi_device *sdev)
                if (raid_device)
                        raid_device->sdev = sdev; /* raid is single lun */
                spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
-       } else {
-               /* set TLR bit for SSP devices */
-               if (!(ioc->facts.IOCCapabilities &
-                    MPI2_IOCFACTS_CAPABILITY_TLR))
-                       goto out;
-               spin_lock_irqsave(&ioc->sas_device_lock, flags);
-               sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
-                  sas_device_priv_data->sas_target->sas_address);
-               spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
-               if (sas_device && sas_device->device_info &
-                   MPI2_SAS_DEVICE_INFO_SSP_TARGET)
-                       sas_device_priv_data->flags |= MPT_DEVICE_TLR_ON;
        }
 
- out:
        return 0;
 }
 
@@ -1617,6 +1603,32 @@ _scsih_get_volume_capabilities(struct MPT2SAS_ADAPTER *ioc,
 }
 
 /**
+ * _scsih_enable_tlr - setting TLR flags
+ * @ioc: per adapter object
+ * @sdev: scsi device struct
+ *
+ * Enabling Transaction Layer Retries for tape devices when
+ * vpd page 0x90 is present
+ *
+ */
+static void
+_scsih_enable_tlr(struct MPT2SAS_ADAPTER *ioc, struct scsi_device *sdev)
+{
+       /* only for TAPE */
+       if (sdev->type != TYPE_TAPE)
+               return;
+
+       if (!(ioc->facts.IOCCapabilities & MPI2_IOCFACTS_CAPABILITY_TLR))
+               return;
+
+       sas_enable_tlr(sdev);
+       sdev_printk(KERN_INFO, sdev, "TLR %s\n",
+           sas_is_tlr_enabled(sdev) ? "Enabled" : "Disabled");
+       return;
+
+}
+
+/**
  * _scsih_slave_configure - device configure routine.
  * @sdev: scsi device struct
  *
@@ -1761,8 +1773,10 @@ _scsih_slave_configure(struct scsi_device *sdev)
 
        _scsih_change_queue_depth(sdev, qdepth, SCSI_QDEPTH_DEFAULT);
 
-       if (ssp_target)
+       if (ssp_target) {
                sas_read_port_mode_page(sdev);
+               _scsih_enable_tlr(ioc, sdev);
+       }
        return 0;
 }
 
@@ -3049,7 +3063,7 @@ _scsih_qcmd(struct scsi_cmnd *scmd, void (*done)(struct scsi_cmnd *))
        } else
                mpi_control |= MPI2_SCSIIO_CONTROL_SIMPLEQ;
 
-       if ((sas_device_priv_data->flags & MPT_DEVICE_TLR_ON))
+       if (sas_is_tlr_enabled(scmd->device))
                mpi_control |= MPI2_SCSIIO_CONTROL_TLR_ON;
 
        smid = mpt2sas_base_get_smid_scsiio(ioc, ioc->scsi_io_cb_idx, scmd);
@@ -3438,10 +3452,11 @@ _scsih_io_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
                    le32_to_cpu(mpi_reply->ResponseInfo) & 0xFF;
        if (!sas_device_priv_data->tlr_snoop_check) {
                sas_device_priv_data->tlr_snoop_check++;
-               if ((sas_device_priv_data->flags & MPT_DEVICE_TLR_ON) &&
-                   response_code == MPI2_SCSITASKMGMT_RSP_INVALID_FRAME)
-                       sas_device_priv_data->flags &=
-                           ~MPT_DEVICE_TLR_ON;
+               if (sas_is_tlr_enabled(scmd->device) &&
+                   response_code == MPI2_SCSITASKMGMT_RSP_INVALID_FRAME) {
+                       sas_disable_tlr(scmd->device);
+                       sdev_printk(KERN_INFO, scmd->device, "TLR disabled\n");
+               }
        }
 
        xfer_cnt = le32_to_cpu(mpi_reply->TransferCount);