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

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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>
This commit is contained in:
Kashyap, Desai 2009-12-16 18:56:28 +05:30 committed by James Bottomley
parent f4af3c1411
commit 84f0b04a0e
1 changed files with 35 additions and 20 deletions
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55
drivers/scsi/mpt2sas/mpt2sas_scsih.c
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@ -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;
}
@ -1616,6 +1602,32 @@ _scsih_get_volume_capabilities(struct MPT2SAS_ADAPTER *ioc,
kfree(vol_pg0);
}
/**
* _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);