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[SCSI] zfcp: Introduce experimental support for DIF/DIX

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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
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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