diff options
| author | Felix Beck <felix.beck@de.ibm.com> | 2010-07-16 15:37:42 +0200 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2010-07-28 09:48:56 -0500 |
| commit | ef3eb71d8ba4fd9d48c5f9310bc9d90ca00323b4 (patch) | |
| tree | 9903cbae6c03184687c51b4be926572913cda93f /drivers/s390/scsi/zfcp_scsi.c | |
| parent | dcc18f48a2f1a44c5e8848f30d0cf53a8066c62a (diff) | |
[SCSI] zfcp: Introduce experimental support for DIF/DIX
Introduce support for DIF/DIX in zfcp: Report the capabilities for the
Scsi_host, map the protection data when issuing I/O requests and
handle the new error codes. Also add the fsf data_direction field to
the hba trace, it is useful information for debugging in that area.
This is an EXPERIMENTAL feature for now.
Signed-off-by: Felix Beck <felix.beck@de.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/s390/scsi/zfcp_scsi.c')
| -rw-r--r-- | drivers/s390/scsi/zfcp_scsi.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c index eb471a1723cd..cb000c9833bb 100644 --- a/drivers/s390/scsi/zfcp_scsi.c +++ b/drivers/s390/scsi/zfcp_scsi.c @@ -12,6 +12,7 @@ #include <linux/types.h> #include <linux/slab.h> #include <scsi/fc/fc_fcp.h> +#include <scsi/scsi_eh.h> #include <asm/atomic.h> #include "zfcp_ext.h" #include "zfcp_dbf.h" @@ -22,6 +23,13 @@ static unsigned int default_depth = 32; module_param_named(queue_depth, default_depth, uint, 0600); MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices"); +static bool enable_dif; + +#ifdef CONFIG_ZFCP_DIF +module_param_named(dif, enable_dif, bool, 0600); +MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support"); +#endif + static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason) { @@ -652,6 +660,51 @@ void zfcp_scsi_scan_work(struct work_struct *work) put_device(&unit->dev); } +/** + * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host + * @adapter: The adapter where to configure DIF/DIX for the SCSI host + */ +void zfcp_scsi_set_prot(struct zfcp_adapter *adapter) +{ + unsigned int mask = 0; + unsigned int data_div; + struct Scsi_Host *shost = adapter->scsi_host; + + data_div = atomic_read(&adapter->status) & + ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED; + + if (enable_dif && + adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1) + mask |= SHOST_DIF_TYPE1_PROTECTION; + + if (enable_dif && data_div && + adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) { + mask |= SHOST_DIX_TYPE1_PROTECTION; + scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); + shost->sg_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2; + shost->max_sectors = ZFCP_QDIO_MAX_SBALES_PER_REQ * 8 / 2; + } + + scsi_host_set_prot(shost, mask); +} + +/** + * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error + * @scmd: The SCSI command to report the error for + * @ascq: The ASCQ to put in the sense buffer + * + * See the error handling in sd_done for the sense codes used here. + * Set DID_SOFT_ERROR to retry the request, if possible. + */ +void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq) +{ + scsi_build_sense_buffer(1, scmd->sense_buffer, + ILLEGAL_REQUEST, 0x10, ascq); + set_driver_byte(scmd, DRIVER_SENSE); + scmd->result |= SAM_STAT_CHECK_CONDITION; + set_host_byte(scmd, DID_SOFT_ERROR); +} + struct fc_function_template zfcp_transport_functions = { .show_starget_port_id = 1, .show_starget_port_name = 1, |