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242ec14551
Suppose more than one non-NPIV FCP device is active on the same channel.
Send I/O to storage and have some of the pending I/O run into a SCSI
command timeout, e.g. due to bit errors on the fibre. Now the error
situation stops. However, we saw FCP requests continue to timeout in the
channel. The abort will be successful, but the subsequent TUR fails.
Scsi_eh starts. The LUN reset fails. The target reset fails. The host
reset only did an FCP device recovery. However, for non-NPIV FCP devices,
this does not close and reopen ports on the SAN-side if other non-NPIV FCP
device(s) share the same open ports.
In order to resolve the continuing FCP request timeouts, we need to
explicitly close and reopen ports on the SAN-side.
This was missing since the beginning of zfcp in v2.6.0 history commit
ea127f975424 ("[PATCH] s390 (7/7): zfcp host adapter.").
Note: The FSF requests for forced port reopen could run into FSF request
timeouts due to other reasons. This would trigger an internal FCP device
recovery. Pending forced port reopen recoveries would get dismissed. So
some ports might not get fully reopened during this host reset handler.
However, subsequent I/O would trigger the above described escalation and
eventually all ports would be forced reopen to resolve any continuing FCP
request timeouts due to earlier bit errors.
Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: <stable@vger.kernel.org> #3.0+
Reviewed-by: Jens Remus <jremus@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
181 lines
8.6 KiB
C
181 lines
8.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* zfcp device driver
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*
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* External function declarations.
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*
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* Copyright IBM Corp. 2002, 2018
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*/
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#ifndef ZFCP_EXT_H
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#define ZFCP_EXT_H
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#include <linux/types.h>
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#include <scsi/fc/fc_els.h>
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#include "zfcp_def.h"
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#include "zfcp_fc.h"
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/* zfcp_aux.c */
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extern struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *, u64);
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extern struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *);
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extern struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *, u64, u32,
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u32);
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extern void zfcp_sg_free_table(struct scatterlist *, int);
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extern int zfcp_sg_setup_table(struct scatterlist *, int);
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extern void zfcp_adapter_release(struct kref *);
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extern void zfcp_adapter_unregister(struct zfcp_adapter *);
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/* zfcp_ccw.c */
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extern struct ccw_driver zfcp_ccw_driver;
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extern struct zfcp_adapter *zfcp_ccw_adapter_by_cdev(struct ccw_device *);
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extern void zfcp_ccw_adapter_put(struct zfcp_adapter *);
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/* zfcp_dbf.c */
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extern int zfcp_dbf_adapter_register(struct zfcp_adapter *);
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extern void zfcp_dbf_adapter_unregister(struct zfcp_adapter *);
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extern void zfcp_dbf_rec_trig(char *, struct zfcp_adapter *,
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struct zfcp_port *, struct scsi_device *, u8, u8);
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extern void zfcp_dbf_rec_trig_lock(char *tag, struct zfcp_adapter *adapter,
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struct zfcp_port *port,
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struct scsi_device *sdev, u8 want, u8 need);
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extern void zfcp_dbf_rec_run(char *, struct zfcp_erp_action *);
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extern void zfcp_dbf_rec_run_lvl(int level, char *tag,
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struct zfcp_erp_action *erp);
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extern void zfcp_dbf_rec_run_wka(char *, struct zfcp_fc_wka_port *, u64);
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extern void zfcp_dbf_hba_fsf_uss(char *, struct zfcp_fsf_req *);
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extern void zfcp_dbf_hba_fsf_res(char *, int, struct zfcp_fsf_req *);
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extern void zfcp_dbf_hba_bit_err(char *, struct zfcp_fsf_req *);
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extern void zfcp_dbf_hba_def_err(struct zfcp_adapter *, u64, u16, void **);
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extern void zfcp_dbf_hba_basic(char *, struct zfcp_adapter *);
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extern void zfcp_dbf_san_req(char *, struct zfcp_fsf_req *, u32);
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extern void zfcp_dbf_san_res(char *, struct zfcp_fsf_req *);
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extern void zfcp_dbf_san_in_els(char *, struct zfcp_fsf_req *);
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extern void zfcp_dbf_scsi_common(char *tag, int level, struct scsi_device *sdev,
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struct scsi_cmnd *sc,
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struct zfcp_fsf_req *fsf);
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extern void zfcp_dbf_scsi_eh(char *tag, struct zfcp_adapter *adapter,
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unsigned int scsi_id, int ret);
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/* zfcp_erp.c */
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extern void zfcp_erp_set_adapter_status(struct zfcp_adapter *, u32);
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extern void zfcp_erp_clear_adapter_status(struct zfcp_adapter *, u32);
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extern void zfcp_erp_port_forced_no_port_dbf(char *dbftag,
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struct zfcp_adapter *adapter,
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u64 port_name, u32 port_id);
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extern void zfcp_erp_adapter_reopen(struct zfcp_adapter *, int, char *);
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extern void zfcp_erp_adapter_shutdown(struct zfcp_adapter *, int, char *);
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extern void zfcp_erp_set_port_status(struct zfcp_port *, u32);
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extern void zfcp_erp_clear_port_status(struct zfcp_port *, u32);
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extern void zfcp_erp_port_reopen(struct zfcp_port *port, int clear,
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char *dbftag);
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extern void zfcp_erp_port_shutdown(struct zfcp_port *, int, char *);
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extern void zfcp_erp_port_forced_reopen(struct zfcp_port *, int, char *);
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extern void zfcp_erp_port_forced_reopen_all(struct zfcp_adapter *adapter,
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int clear, char *dbftag);
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extern void zfcp_erp_set_lun_status(struct scsi_device *, u32);
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extern void zfcp_erp_clear_lun_status(struct scsi_device *, u32);
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extern void zfcp_erp_lun_reopen(struct scsi_device *, int, char *);
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extern void zfcp_erp_lun_shutdown(struct scsi_device *, int, char *);
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extern void zfcp_erp_lun_shutdown_wait(struct scsi_device *, char *);
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extern int zfcp_erp_thread_setup(struct zfcp_adapter *);
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extern void zfcp_erp_thread_kill(struct zfcp_adapter *);
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extern void zfcp_erp_wait(struct zfcp_adapter *);
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extern void zfcp_erp_notify(struct zfcp_erp_action *, unsigned long);
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extern void zfcp_erp_timeout_handler(struct timer_list *t);
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extern void zfcp_erp_adapter_reset_sync(struct zfcp_adapter *adapter,
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char *dbftag);
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/* zfcp_fc.c */
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extern struct kmem_cache *zfcp_fc_req_cache;
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extern void zfcp_fc_enqueue_event(struct zfcp_adapter *,
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enum fc_host_event_code event_code, u32);
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extern void zfcp_fc_post_event(struct work_struct *);
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extern void zfcp_fc_scan_ports(struct work_struct *);
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extern void zfcp_fc_incoming_els(struct zfcp_fsf_req *);
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extern void zfcp_fc_port_did_lookup(struct work_struct *);
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extern void zfcp_fc_trigger_did_lookup(struct zfcp_port *);
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extern void zfcp_fc_plogi_evaluate(struct zfcp_port *, struct fc_els_flogi *);
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extern void zfcp_fc_test_link(struct zfcp_port *);
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extern void zfcp_fc_link_test_work(struct work_struct *);
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extern void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *);
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extern int zfcp_fc_gs_setup(struct zfcp_adapter *);
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extern void zfcp_fc_gs_destroy(struct zfcp_adapter *);
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extern int zfcp_fc_exec_bsg_job(struct bsg_job *);
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extern int zfcp_fc_timeout_bsg_job(struct bsg_job *);
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extern void zfcp_fc_sym_name_update(struct work_struct *);
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extern unsigned int zfcp_fc_port_scan_backoff(void);
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extern void zfcp_fc_conditional_port_scan(struct zfcp_adapter *);
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extern void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *);
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/* zfcp_fsf.c */
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extern struct kmem_cache *zfcp_fsf_qtcb_cache;
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extern int zfcp_fsf_open_port(struct zfcp_erp_action *);
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extern int zfcp_fsf_open_wka_port(struct zfcp_fc_wka_port *);
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extern int zfcp_fsf_close_wka_port(struct zfcp_fc_wka_port *);
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extern int zfcp_fsf_close_port(struct zfcp_erp_action *);
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extern int zfcp_fsf_close_physical_port(struct zfcp_erp_action *);
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extern int zfcp_fsf_open_lun(struct zfcp_erp_action *);
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extern int zfcp_fsf_close_lun(struct zfcp_erp_action *);
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extern int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *);
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extern int zfcp_fsf_exchange_config_data_sync(struct zfcp_qdio *,
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struct fsf_qtcb_bottom_config *);
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extern int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *);
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extern int zfcp_fsf_exchange_port_data_sync(struct zfcp_qdio *,
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struct fsf_qtcb_bottom_port *);
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extern void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *);
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extern int zfcp_fsf_status_read(struct zfcp_qdio *);
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extern int zfcp_status_read_refill(struct zfcp_adapter *adapter);
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extern int zfcp_fsf_send_ct(struct zfcp_fc_wka_port *, struct zfcp_fsf_ct_els *,
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mempool_t *, unsigned int);
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extern int zfcp_fsf_send_els(struct zfcp_adapter *, u32,
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struct zfcp_fsf_ct_els *, unsigned int);
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extern int zfcp_fsf_fcp_cmnd(struct scsi_cmnd *);
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extern void zfcp_fsf_req_free(struct zfcp_fsf_req *);
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extern struct zfcp_fsf_req *zfcp_fsf_fcp_task_mgmt(struct scsi_device *sdev,
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u8 tm_flags);
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extern struct zfcp_fsf_req *zfcp_fsf_abort_fcp_cmnd(struct scsi_cmnd *);
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extern void zfcp_fsf_reqid_check(struct zfcp_qdio *, int);
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/* zfcp_qdio.c */
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extern int zfcp_qdio_setup(struct zfcp_adapter *);
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extern void zfcp_qdio_destroy(struct zfcp_qdio *);
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extern int zfcp_qdio_sbal_get(struct zfcp_qdio *);
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extern int zfcp_qdio_send(struct zfcp_qdio *, struct zfcp_qdio_req *);
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extern int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *, struct zfcp_qdio_req *,
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struct scatterlist *);
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extern int zfcp_qdio_open(struct zfcp_qdio *);
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extern void zfcp_qdio_close(struct zfcp_qdio *);
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extern void zfcp_qdio_siosl(struct zfcp_adapter *);
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/* zfcp_scsi.c */
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extern bool zfcp_experimental_dix;
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extern struct scsi_transport_template *zfcp_scsi_transport_template;
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extern int zfcp_scsi_adapter_register(struct zfcp_adapter *);
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extern void zfcp_scsi_adapter_unregister(struct zfcp_adapter *);
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extern struct fc_function_template zfcp_transport_functions;
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extern void zfcp_scsi_rport_work(struct work_struct *);
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extern void zfcp_scsi_schedule_rport_register(struct zfcp_port *);
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extern void zfcp_scsi_schedule_rport_block(struct zfcp_port *);
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extern void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *);
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extern void zfcp_scsi_set_prot(struct zfcp_adapter *);
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extern void zfcp_scsi_dif_sense_error(struct scsi_cmnd *, int);
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/* zfcp_sysfs.c */
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extern const struct attribute_group *zfcp_unit_attr_groups[];
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extern struct attribute_group zfcp_sysfs_adapter_attrs;
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extern const struct attribute_group *zfcp_port_attr_groups[];
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extern struct mutex zfcp_sysfs_port_units_mutex;
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extern struct device_attribute *zfcp_sysfs_sdev_attrs[];
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extern struct device_attribute *zfcp_sysfs_shost_attrs[];
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/* zfcp_unit.c */
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extern int zfcp_unit_add(struct zfcp_port *, u64);
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extern int zfcp_unit_remove(struct zfcp_port *, u64);
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extern struct zfcp_unit *zfcp_unit_find(struct zfcp_port *, u64);
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extern struct scsi_device *zfcp_unit_sdev(struct zfcp_unit *unit);
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extern void zfcp_unit_scsi_scan(struct zfcp_unit *);
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extern void zfcp_unit_queue_scsi_scan(struct zfcp_port *);
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extern unsigned int zfcp_unit_sdev_status(struct zfcp_unit *);
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#endif /* ZFCP_EXT_H */
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