From: Martin Schwidefsky <schwidefsky@de.ibm.com>
From: Heiko Carstens <heiko.carstens@de.ibm.com>
From: Andreas Herrmann <aherrman@de.ibm.com>
From: Maxim Shchetynin <maxim@de.ibm.com>
zfcp host adapter changes:
- Exploit FC transport class and autoselect SCSI_FC_ATTRS for zfcp.
- Fix acl download to zfcp controller.
- Change message loglevels to make zfcp less noisy.
- Don't wait for SBAL to finish for command aborts after a timeout
and for logical unit or target resets.
- Force reopen of port if link test failed.
- Fix race between qdio_shutdown and do_QDIO.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/arch/s390/defconfig | 2
25-akpm/drivers/s390/scsi/zfcp_aux.c | 13 +++--
25-akpm/drivers/s390/scsi/zfcp_def.h | 20 ++++---
25-akpm/drivers/s390/scsi/zfcp_erp.c | 87 ++++++++++++++--------------------
25-akpm/drivers/s390/scsi/zfcp_ext.h | 4 +
25-akpm/drivers/s390/scsi/zfcp_fsf.c | 23 ++++++--
25-akpm/drivers/s390/scsi/zfcp_scsi.c | 51 +++++++++++++++++--
25-akpm/drivers/scsi/Kconfig | 1
8 files changed, 123 insertions(+), 78 deletions(-)
diff -puN arch/s390/defconfig~s390-zfcp-host-adapter arch/s390/defconfig
--- 25/arch/s390/defconfig~s390-zfcp-host-adapter 2004-06-30 10:16:51.254967896 -0700
+++ 25-akpm/arch/s390/defconfig 2004-06-30 10:16:51.285963184 -0700
@@ -124,7 +124,7 @@ CONFIG_SCSI_LOGGING=y
# SCSI Transport Attributes
#
# CONFIG_SCSI_SPI_ATTRS is not set
-# CONFIG_SCSI_FC_ATTRS is not set
+CONFIG_SCSI_FC_ATTRS=y
#
# SCSI low-level drivers
diff -puN drivers/s390/scsi/zfcp_aux.c~s390-zfcp-host-adapter drivers/s390/scsi/zfcp_aux.c
--- 25/drivers/s390/scsi/zfcp_aux.c~s390-zfcp-host-adapter 2004-06-30 10:16:51.255967744 -0700
+++ 25-akpm/drivers/s390/scsi/zfcp_aux.c 2004-06-30 10:16:51.287962880 -0700
@@ -29,7 +29,7 @@
*/
/* this drivers version (do not edit !!! generated and updated by cvs) */
-#define ZFCP_AUX_REVISION "$Revision: 1.108 $"
+#define ZFCP_AUX_REVISION "$Revision: 1.114 $"
#include "zfcp_ext.h"
@@ -310,6 +310,10 @@ zfcp_module_init(void)
/* initialize adapters to be removed list head */
INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
+ zfcp_transport_template = fc_attach_transport(&zfcp_transport_functions);
+ if (!zfcp_transport_template)
+ return -ENODEV;
+
#ifdef CONFIG_S390_SUPPORT
retval = register_ioctl32_conversion(zfcp_ioctl_trans.cmd,
zfcp_ioctl_trans.handler);
@@ -414,7 +418,7 @@ zfcp_cfdc_dev_ioctl(struct inode *inode,
retval = -ENOMEM;
goto out;
}
- sg_list->count = 0;
+ memset(sg_list, 0, sizeof(*sg_list));
if (command != ZFCP_CFDC_IOC) {
ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
@@ -599,6 +603,7 @@ zfcp_sg_list_alloc(struct zfcp_sg_list *
sg_list->sg = kmalloc(sg_list->count * sizeof(struct scatterlist),
GFP_KERNEL);
if (sg_list->sg == NULL) {
+ sg_list->count = 0;
retval = -ENOMEM;
goto out;
}
@@ -635,11 +640,13 @@ zfcp_sg_list_free(struct zfcp_sg_list *s
unsigned int i;
int retval = 0;
- BUG_ON((sg_list->sg == NULL) || (sg_list == NULL));
+ BUG_ON(sg_list == NULL);
for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
__free_pages(sg->page, 0);
+ kfree(sg_list->sg);
+
return retval;
}
diff -puN drivers/s390/scsi/zfcp_def.h~s390-zfcp-host-adapter drivers/s390/scsi/zfcp_def.h
--- 25/drivers/s390/scsi/zfcp_def.h~s390-zfcp-host-adapter 2004-06-30 10:16:51.257967440 -0700
+++ 25-akpm/drivers/s390/scsi/zfcp_def.h 2004-06-30 10:16:51.288962728 -0700
@@ -33,7 +33,7 @@
#define ZFCP_DEF_H
/* this drivers version (do not edit !!! generated and updated by cvs) */
-#define ZFCP_DEF_REVISION "$Revision: 1.73 $"
+#define ZFCP_DEF_REVISION "$Revision: 1.75 $"
/*************************** INCLUDES *****************************************/
@@ -47,6 +47,8 @@
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_fc.h>
#include "../../fc4/fc.h"
#include "zfcp_fsf.h"
#include <asm/ccwdev.h>
@@ -509,14 +511,14 @@ struct zfcp_ls_rnid_acc {
/* all log-level defaults are combined to generate initial log-level */
#define ZFCP_LOG_LEVEL_DEFAULTS \
- (ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_INFO, ZFCP_LOG_AREA_OTHER) | \
- ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_INFO, ZFCP_LOG_AREA_SCSI) | \
- ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_INFO, ZFCP_LOG_AREA_FSF) | \
- ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_INFO, ZFCP_LOG_AREA_CONFIG) | \
- ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_INFO, ZFCP_LOG_AREA_CIO) | \
- ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_INFO, ZFCP_LOG_AREA_QDIO) | \
- ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_INFO, ZFCP_LOG_AREA_ERP) | \
- ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_INFO, ZFCP_LOG_AREA_FC))
+ (ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_OTHER) | \
+ ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_SCSI) | \
+ ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_FSF) | \
+ ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_CONFIG) | \
+ ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_CIO) | \
+ ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_QDIO) | \
+ ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_ERP) | \
+ ZFCP_SET_LOG_NIBBLE(ZFCP_LOG_LEVEL_NORMAL, ZFCP_LOG_AREA_FC))
/* check whether we have the right level for logging */
#define ZFCP_LOG_CHECK(level) \
diff -puN drivers/s390/scsi/zfcp_erp.c~s390-zfcp-host-adapter drivers/s390/scsi/zfcp_erp.c
--- 25/drivers/s390/scsi/zfcp_erp.c~s390-zfcp-host-adapter 2004-06-30 10:16:51.259967136 -0700
+++ 25-akpm/drivers/s390/scsi/zfcp_erp.c 2004-06-30 10:16:51.291962272 -0700
@@ -31,7 +31,7 @@
#define ZFCP_LOG_AREA ZFCP_LOG_AREA_ERP
/* this drivers version (do not edit !!! generated and updated by cvs) */
-#define ZFCP_ERP_REVISION "$Revision: 1.54 $"
+#define ZFCP_ERP_REVISION "$Revision: 1.56 $"
#include "zfcp_ext.h"
@@ -435,8 +435,20 @@ zfcp_els_handler(unsigned long data)
u8 req_code, resp_code;
int retval = 0;
- if (send_els->status != 0)
+ if (send_els->status != 0) {
+ ZFCP_LOG_NORMAL("ELS request timed out, physical port reopen "
+ "of port 0x%016Lx on adapter %s failed\n",
+ port->wwpn, zfcp_get_busid_by_port(port));
+ debug_text_event(port->adapter->erp_dbf, 3, "forcreop");
+ retval = zfcp_erp_port_forced_reopen(port, 0);
+ if (retval != 0) {
+ ZFCP_LOG_NORMAL("reopen of remote port 0x%016Lx "
+ "on adapter %s failed\n", port->wwpn,
+ zfcp_get_busid_by_port(port));
+ retval = -EPERM;
+ }
goto skip_fsfstatus;
+ }
req = (void*)((page_to_pfn(send_els->req->page) << PAGE_SHIFT) + send_els->req->offset);
resp = (void*)((page_to_pfn(send_els->resp->page) << PAGE_SHIFT) + send_els->resp->offset);
@@ -2286,7 +2298,6 @@ zfcp_erp_adapter_strategy_open_qdio(stru
int i;
volatile struct qdio_buffer_element *sbale;
struct zfcp_adapter *adapter = erp_action->adapter;
- int retval_cleanup = 0;
if (atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
ZFCP_LOG_NORMAL("bug: second attempt to set up QDIO on "
@@ -2301,7 +2312,7 @@ zfcp_erp_adapter_strategy_open_qdio(stru
zfcp_get_busid_by_adapter(adapter));
goto failed_qdio_establish;
}
- ZFCP_LOG_DEBUG("queues established\n");
+ debug_text_event(adapter->erp_dbf, 3, "qdio_est");
if (qdio_activate(adapter->ccw_device, 0) != 0) {
ZFCP_LOG_INFO("error: activation of QDIO queues failed "
@@ -2309,7 +2320,7 @@ zfcp_erp_adapter_strategy_open_qdio(stru
zfcp_get_busid_by_adapter(adapter));
goto failed_qdio_activate;
}
- ZFCP_LOG_DEBUG("queues activated\n");
+ debug_text_event(adapter->erp_dbf, 3, "qdio_act");
/*
* put buffers into response queue,
@@ -2357,19 +2368,15 @@ zfcp_erp_adapter_strategy_open_qdio(stru
/* NOP */
failed_qdio_activate:
- /* DEBUG */
- //__ZFCP_WAIT_EVENT_TIMEOUT(timeout, 0);
- /* cleanup queues previously established */
- retval_cleanup = qdio_shutdown(adapter->ccw_device,
- QDIO_FLAG_CLEANUP_USING_CLEAR);
- if (retval_cleanup) {
- ZFCP_LOG_NORMAL("bug: shutdown of QDIO queues failed "
- "(retval=%d)\n", retval_cleanup);
+ debug_text_event(adapter->erp_dbf, 3, "qdio_down1a");
+ while (qdio_shutdown(adapter->ccw_device,
+ QDIO_FLAG_CLEANUP_USING_CLEAR) == -EINPROGRESS) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(HZ);
}
+ debug_text_event(adapter->erp_dbf, 3, "qdio_down1b");
failed_qdio_establish:
- atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
-
failed_sanity:
retval = ZFCP_ERP_FAILED;
@@ -2401,42 +2408,22 @@ zfcp_erp_adapter_strategy_close_qdio(str
goto out;
}
- /* cleanup queues previously established */
-
/*
- * MUST NOT LOCK - qdio_cleanup might call schedule
- * FIXME: need another way to make cleanup safe
+ * Get queue_lock and clear QDIOUP flag. Thus it's guaranteed that
+ * do_QDIO won't be called while qdio_shutdown is in progress.
*/
- /* Note:
- * We need the request_queue lock here, otherwise there exists the
- * following race:
- *
- * queuecommand calls create_fcp_commmand_task...calls req_create,
- * gets sbal x to x+y - meanwhile adapter reopen is called, completes
- * - req_send calls do_QDIO for sbal x to x+y, i.e. wrong indices.
- *
- * with lock:
- * queuecommand calls create_fcp_commmand_task...calls req_create,
- * gets sbal x to x+y - meanwhile adapter reopen is called, waits
- * - req_send calls do_QDIO for sbal x to x+y, i.e. wrong indices
- * but do_QDIO fails as adapter_reopen is still waiting for the lock
- * OR
- * queuecommand calls create_fcp_commmand_task...calls req_create
- * - meanwhile adapter reopen is called...completes,
- * - gets sbal 0 to 0+y, - req_send calls do_QDIO for sbal 0 to 0+y,
- * i.e. correct indices...though an fcp command is called before
- * exchange config data...that should be fine, however
- */
- if (qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR)) {
- /*
- * FIXME(design):
- * What went wrong? What to do best? Proper retval?
- */
- ZFCP_LOG_NORMAL("bug: shutdown of QDIO queues failed on "
- "adapter %s\n",
- zfcp_get_busid_by_adapter(adapter));
- } else
- ZFCP_LOG_DEBUG("queues cleaned up\n");
+
+ write_lock_irq(&adapter->request_queue.queue_lock);
+ atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
+ write_unlock_irq(&adapter->request_queue.queue_lock);
+
+ debug_text_event(adapter->erp_dbf, 3, "qdio_down2a");
+ while (qdio_shutdown(adapter->ccw_device,
+ QDIO_FLAG_CLEANUP_USING_CLEAR) == -EINPROGRESS) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(HZ);
+ }
+ debug_text_event(adapter->erp_dbf, 3, "qdio_down2b");
/*
* First we had to stop QDIO operation.
@@ -2459,8 +2446,6 @@ zfcp_erp_adapter_strategy_close_qdio(str
adapter->request_queue.free_index = 0;
atomic_set(&adapter->request_queue.free_count, 0);
adapter->request_queue.distance_from_int = 0;
-
- atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
out:
return retval;
}
diff -puN drivers/s390/scsi/zfcp_ext.h~s390-zfcp-host-adapter drivers/s390/scsi/zfcp_ext.h
--- 25/drivers/s390/scsi/zfcp_ext.h~s390-zfcp-host-adapter 2004-06-30 10:16:51.261966832 -0700
+++ 25-akpm/drivers/s390/scsi/zfcp_ext.h 2004-06-30 10:16:51.292962120 -0700
@@ -31,7 +31,7 @@
#ifndef ZFCP_EXT_H
#define ZFCP_EXT_H
/* this drivers version (do not edit !!! generated and updated by cvs) */
-#define ZFCP_EXT_REVISION "$Revision: 1.50 $"
+#define ZFCP_EXT_REVISION "$Revision: 1.51 $"
#include "zfcp_def.h"
@@ -136,6 +136,8 @@ extern int zfcp_scsi_command_async(struc
struct scsi_cmnd *scsi_cmnd);
extern int zfcp_scsi_command_sync(struct zfcp_unit *unit,
struct scsi_cmnd *scsi_cmnd);
+extern struct scsi_transport_template *zfcp_transport_template;
+extern struct fc_function_template zfcp_transport_functions;
/******************************** ERP ****************************************/
extern void zfcp_erp_modify_adapter_status(struct zfcp_adapter *, u32, int);
diff -puN drivers/s390/scsi/zfcp_fsf.c~s390-zfcp-host-adapter drivers/s390/scsi/zfcp_fsf.c
--- 25/drivers/s390/scsi/zfcp_fsf.c~s390-zfcp-host-adapter 2004-06-30 10:16:51.263966528 -0700
+++ 25-akpm/drivers/s390/scsi/zfcp_fsf.c 2004-06-30 10:16:51.296961512 -0700
@@ -29,7 +29,7 @@
*/
/* this drivers version (do not edit !!! generated and updated by cvs) */
-#define ZFCP_FSF_C_REVISION "$Revision: 1.47 $"
+#define ZFCP_FSF_C_REVISION "$Revision: 1.49 $"
#include "zfcp_ext.h"
@@ -3997,15 +3997,14 @@ zfcp_fsf_send_fcp_command_task_handler(s
scpnt->result |= fcp_rsp_iu->scsi_status;
if (unlikely(fcp_rsp_iu->scsi_status)) {
/* DEBUG */
- ZFCP_LOG_NORMAL("status for SCSI Command:\n");
- ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
+ ZFCP_LOG_DEBUG("status for SCSI Command:\n");
+ ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
scpnt->cmnd, scpnt->cmd_len);
-
- ZFCP_LOG_NORMAL("SCSI status code 0x%x\n",
+ ZFCP_LOG_DEBUG("SCSI status code 0x%x\n",
fcp_rsp_iu->scsi_status);
- ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
+ ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
(void *) fcp_rsp_iu, sizeof (struct fcp_rsp_iu));
- ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
+ ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
zfcp_get_fcp_sns_info_ptr(fcp_rsp_iu),
fcp_rsp_iu->fcp_sns_len);
}
@@ -4782,6 +4781,16 @@ zfcp_fsf_req_create(struct zfcp_adapter
goto failed_sbals;
}
+ /*
+ * We hold queue_lock here. Check if QDIOUP is set and let request fail
+ * if it is not set (see also *_open_qdio and *_close_qdio).
+ */
+
+ if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
+ write_unlock_irqrestore(&req_queue->queue_lock, *lock_flags);
+ goto failed_sbals;
+ }
+
fsf_req->adapter = adapter; /* pointer to "parent" adapter */
fsf_req->fsf_command = fsf_cmd;
fsf_req->sbal_number = 1;
diff -puN drivers/s390/scsi/zfcp_scsi.c~s390-zfcp-host-adapter drivers/s390/scsi/zfcp_scsi.c
--- 25/drivers/s390/scsi/zfcp_scsi.c~s390-zfcp-host-adapter 2004-06-30 10:16:51.265966224 -0700
+++ 25-akpm/drivers/s390/scsi/zfcp_scsi.c 2004-06-30 10:16:51.297961360 -0700
@@ -31,7 +31,7 @@
#define ZFCP_LOG_AREA ZFCP_LOG_AREA_SCSI
/* this drivers version (do not edit !!! generated and updated by cvs) */
-#define ZFCP_SCSI_REVISION "$Revision: 1.62 $"
+#define ZFCP_SCSI_REVISION "$Revision: 1.65 $"
#include "zfcp_ext.h"
@@ -51,6 +51,8 @@ static struct zfcp_unit *zfcp_unit_looku
static struct device_attribute *zfcp_sysfs_sdev_attrs[];
+struct scsi_transport_template *zfcp_transport_template;
+
struct zfcp_data zfcp_data = {
.scsi_host_template = {
name: ZFCP_NAME,
@@ -508,8 +510,7 @@ zfcp_scsi_eh_abort_handler(struct scsi_c
ZFCP_LOG_DEBUG("unit 0x%016Lx (%p)\n", unit->fcp_lun, unit);
/*
- * The 'Abort FCP Command' routine may block (call schedule)
- * because it may wait for a free SBAL.
+ * We block (call schedule)
* That's why we must release the lock and enable the
* interrupts before.
* On the other hand we do not need the lock anymore since
@@ -518,8 +519,7 @@ zfcp_scsi_eh_abort_handler(struct scsi_c
write_unlock_irqrestore(&adapter->abort_lock, flags);
/* call FSF routine which does the abort */
new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
- adapter,
- unit, ZFCP_WAIT_FOR_SBAL);
+ adapter, unit, 0);
ZFCP_LOG_DEBUG("new_fsf_req=%p\n", new_fsf_req);
if (!new_fsf_req) {
retval = FAILED;
@@ -657,7 +657,7 @@ zfcp_task_management_function(struct zfc
/* issue task management function */
fsf_req = zfcp_fsf_send_fcp_command_task_management
- (adapter, unit, tm_flags, ZFCP_WAIT_FOR_SBAL);
+ (adapter, unit, tm_flags, 0);
if (!fsf_req) {
ZFCP_LOG_INFO("error: creation of task management request "
"failed for unit 0x%016Lx on port 0x%016Lx on "
@@ -768,6 +768,7 @@ zfcp_adapter_scsi_register(struct zfcp_a
adapter->scsi_host->max_channel = 0;
adapter->scsi_host->unique_id = unique_id++; /* FIXME */
adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
+ adapter->scsi_host->transportt = zfcp_transport_template;
/*
* Reverse mapping of the host number to avoid race condition
*/
@@ -823,6 +824,44 @@ zfcp_fsf_start_scsi_er_timer(struct zfcp
add_timer(&adapter->scsi_er_timer);
}
+/*
+ * Support functions for FC transport class
+ */
+static void
+zfcp_get_port_id(struct scsi_device *sdev)
+{
+ struct zfcp_unit *unit;
+
+ unit = (struct zfcp_unit *) sdev->hostdata;
+ fc_port_id(sdev) = unit->port->d_id;
+}
+
+static void
+zfcp_get_port_name(struct scsi_device *sdev)
+{
+ struct zfcp_unit *unit;
+
+ unit = (struct zfcp_unit *) sdev->hostdata;
+ fc_port_name(sdev) = unit->port->wwpn;
+}
+
+static void
+zfcp_get_node_name(struct scsi_device *sdev)
+{
+ struct zfcp_unit *unit;
+
+ unit = (struct zfcp_unit *) sdev->hostdata;
+ fc_node_name(sdev) = unit->port->wwnn;
+}
+
+struct fc_function_template zfcp_transport_functions = {
+ .get_port_id = zfcp_get_port_id,
+ .get_port_name = zfcp_get_port_name,
+ .get_node_name = zfcp_get_node_name,
+ .show_port_id = 1,
+ .show_port_name = 1,
+ .show_node_name = 1,
+};
/**
* ZFCP_DEFINE_SCSI_ATTR
diff -puN drivers/scsi/Kconfig~s390-zfcp-host-adapter drivers/scsi/Kconfig
--- 25/drivers/scsi/Kconfig~s390-zfcp-host-adapter 2004-06-30 10:16:51.282963640 -0700
+++ 25-akpm/drivers/scsi/Kconfig 2004-06-30 10:16:51.299961056 -0700
@@ -1738,6 +1738,7 @@ config SCSI_SUNESP
config ZFCP
tristate "FCP host bus adapter driver for IBM eServer zSeries"
depends on ARCH_S390 && SCSI
+ select SCSI_FC_ATTRS
help
If you want to access SCSI devices attached to your IBM eServer
zSeries by means of Fibre Channel interfaces say Y.
_