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[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>
This commit is contained in:
Felix Beck 2010-07-16 15:37:42 +02:00 committed by James Bottomley
parent dcc18f48a2
commit ef3eb71d8b
10 changed files with 189 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/s390/scsi/zfcp_dbf.c
View File

@ -155,6 +155,8 @@ void _zfcp_dbf_hba_fsf_response(const char *tag2, int level,
if (scsi_cmnd) {
response->u.fcp.cmnd = (unsigned long)scsi_cmnd;
response->u.fcp.serial = scsi_cmnd->serial_number;
response->u.fcp.data_dir =
qtcb->bottom.io.data_direction;
}
break;
@ -326,6 +328,7 @@ static void zfcp_dbf_hba_view_response(char **p,
case FSF_QTCB_FCP_CMND:
if (r->fsf_req_status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT)
break;
zfcp_dbf_out(p, "data_direction", "0x%04x", r->u.fcp.data_dir);
zfcp_dbf_out(p, "scsi_cmnd", "0x%0Lx", r->u.fcp.cmnd);
zfcp_dbf_out(p, "scsi_serial", "0x%016Lx", r->u.fcp.serial);
*p += sprintf(*p, "\n");

1
drivers/s390/scsi/zfcp_dbf.h
View File

@ -111,6 +111,7 @@ struct zfcp_dbf_hba_record_response {
struct {
u64 cmnd;
u64 serial;
u32 data_dir;
} fcp;
struct {
u64 wwpn;

2
drivers/s390/scsi/zfcp_ext.h
View File

@ -164,6 +164,8 @@ extern void zfcp_scsi_schedule_rport_block(struct zfcp_port *);
extern void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *);
extern void zfcp_scsi_scan(struct zfcp_unit *);
extern void zfcp_scsi_scan_work(struct work_struct *);
extern void zfcp_scsi_set_prot(struct zfcp_adapter *);
extern void zfcp_scsi_dif_sense_error(struct scsi_cmnd *, int);
/* zfcp_sysfs.c */
extern struct attribute_group zfcp_sysfs_unit_attrs;

3
drivers/s390/scsi/zfcp_fc.h
View File

@ -220,6 +220,9 @@ void zfcp_fc_scsi_to_fcp(struct fcp_cmnd *fcp, struct scsi_cmnd *scsi)
memcpy(fcp->fc_cdb, scsi->cmnd, scsi->cmd_len);
fcp->fc_dl = scsi_bufflen(scsi);
if (scsi_get_prot_type(scsi) == SCSI_PROT_DIF_TYPE1)
fcp->fc_dl += fcp->fc_dl / scsi->device->sector_size * 8;
}
/**

109
drivers/s390/scsi/zfcp_fsf.c
View File

@ -526,6 +526,8 @@ static int zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *req)
return -EIO;
}
zfcp_scsi_set_prot(adapter);
return 0;
}
@ -988,6 +990,7 @@ static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
bytes = zfcp_qdio_sbals_from_sg(adapter->qdio, &req->qdio_req, sg_req);
if (bytes <= 0)
return -EIO;
zfcp_qdio_set_sbale_last(adapter->qdio, &req->qdio_req);
req->qtcb->bottom.support.req_buf_length = bytes;
zfcp_qdio_skip_to_last_sbale(&req->qdio_req);
@ -996,6 +999,7 @@ static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
req->qtcb->bottom.support.resp_buf_length = bytes;
if (bytes <= 0)
return -EIO;
zfcp_qdio_set_sbale_last(adapter->qdio, &req->qdio_req);
return 0;
}
@ -2038,9 +2042,13 @@ static void zfcp_fsf_req_trace(struct zfcp_fsf_req *req, struct scsi_cmnd *scsi)
blktrc.fabric_lat = lat_in->fabric_lat * ticks;
switch (req->qtcb->bottom.io.data_direction) {
case FSF_DATADIR_DIF_READ_STRIP:
case FSF_DATADIR_DIF_READ_CONVERT:
case FSF_DATADIR_READ:
lat = &unit->latencies.read;
break;
case FSF_DATADIR_DIF_WRITE_INSERT:
case FSF_DATADIR_DIF_WRITE_CONVERT:
case FSF_DATADIR_WRITE:
lat = &unit->latencies.write;
break;
@ -2081,6 +2089,21 @@ static void zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *req)
goto skip_fsfstatus;
}
switch (req->qtcb->header.fsf_status) {
case FSF_INCONSISTENT_PROT_DATA:
case FSF_INVALID_PROT_PARM:
set_host_byte(scpnt, DID_ERROR);
goto skip_fsfstatus;
case FSF_BLOCK_GUARD_CHECK_FAILURE:
zfcp_scsi_dif_sense_error(scpnt, 0x1);
goto skip_fsfstatus;
case FSF_APP_TAG_CHECK_FAILURE:
zfcp_scsi_dif_sense_error(scpnt, 0x2);
goto skip_fsfstatus;
case FSF_REF_TAG_CHECK_FAILURE:
zfcp_scsi_dif_sense_error(scpnt, 0x3);
goto skip_fsfstatus;
}
fcp_rsp = (struct fcp_resp_with_ext *) &req->qtcb->bottom.io.fcp_rsp;
zfcp_fc_eval_fcp_rsp(fcp_rsp, scpnt);
@ -2190,6 +2213,44 @@ static void zfcp_fsf_send_fcp_command_handler(struct zfcp_fsf_req *req)
}
}
static int zfcp_fsf_set_data_dir(struct scsi_cmnd *scsi_cmnd, u32 *data_dir)
{
switch (scsi_get_prot_op(scsi_cmnd)) {
case SCSI_PROT_NORMAL:
switch (scsi_cmnd->sc_data_direction) {
case DMA_NONE:
*data_dir = FSF_DATADIR_CMND;
break;
case DMA_FROM_DEVICE:
*data_dir = FSF_DATADIR_READ;
break;
case DMA_TO_DEVICE:
*data_dir = FSF_DATADIR_WRITE;
break;
case DMA_BIDIRECTIONAL:
return -EINVAL;
}
break;
case SCSI_PROT_READ_STRIP:
*data_dir = FSF_DATADIR_DIF_READ_STRIP;
break;
case SCSI_PROT_WRITE_INSERT:
*data_dir = FSF_DATADIR_DIF_WRITE_INSERT;
break;
case SCSI_PROT_READ_PASS:
*data_dir = FSF_DATADIR_DIF_READ_CONVERT;
break;
case SCSI_PROT_WRITE_PASS:
*data_dir = FSF_DATADIR_DIF_WRITE_CONVERT;
break;
default:
return -EINVAL;
}
return 0;
}
/**
* zfcp_fsf_send_fcp_command_task - initiate an FCP command (for a SCSI command)
* @unit: unit where command is sent to
@ -2201,9 +2262,10 @@ int zfcp_fsf_send_fcp_command_task(struct zfcp_unit *unit,
struct zfcp_fsf_req *req;
struct fcp_cmnd *fcp_cmnd;
unsigned int sbtype = SBAL_FLAGS0_TYPE_READ;
int real_bytes, retval = -EIO;
int real_bytes, retval = -EIO, dix_bytes = 0;
struct zfcp_adapter *adapter = unit->port->adapter;
struct zfcp_qdio *qdio = adapter->qdio;
struct fsf_qtcb_bottom_io *io;
if (unlikely(!(atomic_read(&unit->status) &
ZFCP_STATUS_COMMON_UNBLOCKED)))
@ -2226,46 +2288,46 @@ int zfcp_fsf_send_fcp_command_task(struct zfcp_unit *unit,
goto out;
}
scsi_cmnd->host_scribble = (unsigned char *) req->req_id;
io = &req->qtcb->bottom.io;
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
req->unit = unit;
req->data = scsi_cmnd;
req->handler = zfcp_fsf_send_fcp_command_handler;
req->qtcb->header.lun_handle = unit->handle;
req->qtcb->header.port_handle = unit->port->handle;
req->qtcb->bottom.io.service_class = FSF_CLASS_3;
req->qtcb->bottom.io.fcp_cmnd_length = FCP_CMND_LEN;
io->service_class = FSF_CLASS_3;
io->fcp_cmnd_length = FCP_CMND_LEN;
scsi_cmnd->host_scribble = (unsigned char *) req->req_id;
/*
* set depending on data direction:
* data direction bits in SBALE (SB Type)
* data direction bits in QTCB
*/
switch (scsi_cmnd->sc_data_direction) {
case DMA_NONE:
req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
break;
case DMA_FROM_DEVICE:
req->qtcb->bottom.io.data_direction = FSF_DATADIR_READ;
break;
case DMA_TO_DEVICE:
req->qtcb->bottom.io.data_direction = FSF_DATADIR_WRITE;
break;
case DMA_BIDIRECTIONAL:
goto failed_scsi_cmnd;
if (scsi_get_prot_op(scsi_cmnd) != SCSI_PROT_NORMAL) {
io->data_block_length = scsi_cmnd->device->sector_size;
io->ref_tag_value = scsi_get_lba(scsi_cmnd) & 0xFFFFFFFF;
}
zfcp_fsf_set_data_dir(scsi_cmnd, &io->data_direction);
get_device(&unit->dev);
fcp_cmnd = (struct fcp_cmnd *) &req->qtcb->bottom.io.fcp_cmnd;
zfcp_fc_scsi_to_fcp(fcp_cmnd, scsi_cmnd);
if (scsi_prot_sg_count(scsi_cmnd)) {
zfcp_qdio_set_data_div(qdio, &req->qdio_req,
scsi_prot_sg_count(scsi_cmnd));
dix_bytes = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req,
scsi_prot_sglist(scsi_cmnd));
io->prot_data_length = dix_bytes;
}
real_bytes = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req,
scsi_sglist(scsi_cmnd));
if (unlikely(real_bytes < 0))
if (unlikely(real_bytes < 0) || unlikely(dix_bytes < 0))
goto failed_scsi_cmnd;
zfcp_qdio_set_sbale_last(adapter->qdio, &req->qdio_req);
retval = zfcp_fsf_req_send(req);
if (unlikely(retval))
goto failed_scsi_cmnd;
@ -2389,6 +2451,7 @@ struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
zfcp_fsf_req_free(req);
goto out;
}
zfcp_qdio_set_sbale_last(adapter->qdio, &req->qdio_req);
zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
retval = zfcp_fsf_req_send(req);

24
drivers/s390/scsi/zfcp_fsf.h
View File

@ -80,11 +80,15 @@
#define FSF_REQUEST_SIZE_TOO_LARGE 0x00000061
#define FSF_RESPONSE_SIZE_TOO_LARGE 0x00000062
#define FSF_SBAL_MISMATCH 0x00000063
#define FSF_INCONSISTENT_PROT_DATA 0x00000070
#define FSF_INVALID_PROT_PARM 0x00000071
#define FSF_BLOCK_GUARD_CHECK_FAILURE 0x00000081
#define FSF_APP_TAG_CHECK_FAILURE 0x00000082
#define FSF_REF_TAG_CHECK_FAILURE 0x00000083
#define FSF_ADAPTER_STATUS_AVAILABLE 0x000000AD
#define FSF_UNKNOWN_COMMAND 0x000000E2
#define FSF_UNKNOWN_OP_SUBTYPE 0x000000E3
#define FSF_INVALID_COMMAND_OPTION 0x000000E5
/* #define FSF_ERROR 0x000000FF */
#define FSF_PROT_STATUS_QUAL_SIZE 16
#define FSF_STATUS_QUALIFIER_SIZE 16
@ -147,6 +151,13 @@
#define FSF_DATADIR_WRITE 0x00000001
#define FSF_DATADIR_READ 0x00000002
#define FSF_DATADIR_CMND 0x00000004
#define FSF_DATADIR_DIF_WRITE_INSERT 0x00000009
#define FSF_DATADIR_DIF_READ_STRIP 0x0000000a
#define FSF_DATADIR_DIF_WRITE_CONVERT 0x0000000b
#define FSF_DATADIR_DIF_READ_CONVERT 0X0000000c
/* data protection control flags */
#define FSF_APP_TAG_CHECK_ENABLE 0x10
/* fc service class */
#define FSF_CLASS_3 0x00000003
@ -162,6 +173,8 @@
#define FSF_FEATURE_ELS_CT_CHAINED_SBALS 0x00000020
#define FSF_FEATURE_UPDATE_ALERT 0x00000100
#define FSF_FEATURE_MEASUREMENT_DATA 0x00000200
#define FSF_FEATURE_DIF_PROT_TYPE1 0x00010000
#define FSF_FEATURE_DIX_PROT_TCPIP 0x00020000
/* host connection features */
#define FSF_FEATURE_NPIV_MODE 0x00000001
@ -316,9 +329,14 @@ struct fsf_qtcb_header {
struct fsf_qtcb_bottom_io {
u32 data_direction;
u32 service_class;
u8 res1[8];
u8 res1;
u8 data_prot_flags;
u16 app_tag_value;
u32 ref_tag_value;
u32 fcp_cmnd_length;
u8 res2[12];
u32 data_block_length;
u32 prot_data_length;
u8 res2[4];
u8 fcp_cmnd[FSF_FCP_CMND_SIZE];
u8 fcp_rsp[FSF_FCP_RSP_SIZE];
u8 res3[64];

4
drivers/s390/scsi/zfcp_qdio.c
View File

@ -193,10 +193,6 @@ int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
bytes += sg->length;
}
/* assume that no other SBALEs are to follow in the same SBAL */
sbale = zfcp_qdio_sbale_curr(qdio, q_req);
sbale->flags |= SBAL_FLAGS_LAST_ENTRY;
return bytes;
}

16
drivers/s390/scsi/zfcp_qdio.h
View File

@ -215,4 +215,20 @@ void zfcp_qdio_sbal_limit(struct zfcp_qdio *qdio,
QDIO_MAX_BUFFERS_PER_Q;
}
/**
* zfcp_qdio_set_data_div - set data division count
* @qdio: pointer to struct zfcp_qdio
* @q_req: The current zfcp_qdio_req
* @count: The data division count
*/
static inline
void zfcp_qdio_set_data_div(struct zfcp_qdio *qdio,
struct zfcp_qdio_req *q_req, u32 count)
{
struct qdio_buffer_element *sbale;
sbale = &qdio->req_q[q_req->sbal_first]->element[0];
sbale->length = count;
}
#endif /* ZFCP_QDIO_H */

53
drivers/s390/scsi/zfcp_scsi.c
View File

@ -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,

4
drivers/scsi/Kconfig
View File

@ -1847,6 +1847,10 @@ config ZFCP
called zfcp. If you want to compile it as a module, say M here
and read <file:Documentation/kbuild/modules.txt>.
config ZFCP_DIF
tristate "T10 DIF/DIX support for the zfcp driver (EXPERIMENTAL)"
depends on ZFCP && EXPERIMENTAL
config SCSI_PMCRAID
tristate "PMC SIERRA Linux MaxRAID adapter support"
depends on PCI && SCSI