diff options
Diffstat (limited to 'include/scsi')
| -rw-r--r-- | include/scsi/scsi_transport_srp.h | 83 |
1 files changed, 81 insertions, 2 deletions
diff --git a/include/scsi/scsi_transport_srp.h b/include/scsi/scsi_transport_srp.h index ff0f04ac91aa..4ebf6913b7b2 100644 --- a/include/scsi/scsi_transport_srp.h +++ b/include/scsi/scsi_transport_srp.h @@ -13,6 +13,27 @@ struct srp_rport_identifiers { u8 roles; }; +/** + * enum srp_rport_state - SRP transport layer state + * @SRP_RPORT_RUNNING: Transport layer operational. + * @SRP_RPORT_BLOCKED: Transport layer not operational; fast I/O fail timer + * is running and I/O has been blocked. + * @SRP_RPORT_FAIL_FAST: Fast I/O fail timer has expired; fail I/O fast. + * @SRP_RPORT_LOST: Device loss timer has expired; port is being removed. + */ +enum srp_rport_state { + SRP_RPORT_RUNNING, + SRP_RPORT_BLOCKED, + SRP_RPORT_FAIL_FAST, + SRP_RPORT_LOST, +}; + +/** + * struct srp_rport + * @lld_data: LLD private data. + * @mutex: Protects against concurrent rport reconnect / fast_io_fail / + * dev_loss_tmo activity. + */ struct srp_rport { /* for initiator and target drivers */ @@ -23,11 +44,43 @@ struct srp_rport { /* for initiator drivers */ - void *lld_data; /* LLD private data */ + void *lld_data; + + struct mutex mutex; + enum srp_rport_state state; + bool deleted; + int reconnect_delay; + int failed_reconnects; + struct delayed_work reconnect_work; + int fast_io_fail_tmo; + int dev_loss_tmo; + struct delayed_work fast_io_fail_work; + struct delayed_work dev_loss_work; }; +/** + * struct srp_function_template + * @has_rport_state: Whether or not to create the state, fast_io_fail_tmo and + * dev_loss_tmo sysfs attribute for an rport. + * @reset_timer_if_blocked: Whether or srp_timed_out() should reset the command + * timer if the device on which it has been queued is blocked. + * @reconnect_delay: If not NULL, points to the default reconnect_delay value. + * @fast_io_fail_tmo: If not NULL, points to the default fast_io_fail_tmo value. + * @dev_loss_tmo: If not NULL, points to the default dev_loss_tmo value. + * @reconnect: Callback function for reconnecting to the target. See also + * srp_reconnect_rport(). + * @terminate_rport_io: Callback function for terminating all outstanding I/O + * requests for an rport. + */ struct srp_function_template { /* for initiator drivers */ + bool has_rport_state; + bool reset_timer_if_blocked; + int *reconnect_delay; + int *fast_io_fail_tmo; + int *dev_loss_tmo; + int (*reconnect)(struct srp_rport *rport); + void (*terminate_rport_io)(struct srp_rport *rport); void (*rport_delete)(struct srp_rport *rport); /* for target drivers */ int (* tsk_mgmt_response)(struct Scsi_Host *, u64, u64, int); @@ -38,10 +91,36 @@ extern struct scsi_transport_template * srp_attach_transport(struct srp_function_template *); extern void srp_release_transport(struct scsi_transport_template *); +extern void srp_rport_get(struct srp_rport *rport); +extern void srp_rport_put(struct srp_rport *rport); extern struct srp_rport *srp_rport_add(struct Scsi_Host *, struct srp_rport_identifiers *); extern void srp_rport_del(struct srp_rport *); - +extern int srp_tmo_valid(int reconnect_delay, int fast_io_fail_tmo, + int dev_loss_tmo); +extern int srp_reconnect_rport(struct srp_rport *rport); +extern void srp_start_tl_fail_timers(struct srp_rport *rport); extern void srp_remove_host(struct Scsi_Host *); +/** + * srp_chkready() - evaluate the transport layer state before I/O + * + * Returns a SCSI result code that can be returned by the LLD queuecommand() + * implementation. The role of this function is similar to that of + * fc_remote_port_chkready(). + */ +static inline int srp_chkready(struct srp_rport *rport) +{ + switch (rport->state) { + case SRP_RPORT_RUNNING: + case SRP_RPORT_BLOCKED: + default: + return 0; + case SRP_RPORT_FAIL_FAST: + return DID_TRANSPORT_FAILFAST << 16; + case SRP_RPORT_LOST: + return DID_NO_CONNECT << 16; + } +} + #endif |