150 lines
5.0 KiB
C
150 lines
5.0 KiB
C
#ifndef SCSI_TRANSPORT_SRP_H
|
|
#define SCSI_TRANSPORT_SRP_H
|
|
|
|
#include <linux/transport_class.h>
|
|
#include <linux/types.h>
|
|
#include <linux/mutex.h>
|
|
|
|
#define SRP_RPORT_ROLE_INITIATOR 0
|
|
#define SRP_RPORT_ROLE_TARGET 1
|
|
|
|
struct srp_rport_identifiers {
|
|
u8 port_id[16];
|
|
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: Port is being removed.
|
|
*/
|
|
enum srp_rport_state {
|
|
SRP_RPORT_RUNNING,
|
|
SRP_RPORT_BLOCKED,
|
|
SRP_RPORT_FAIL_FAST,
|
|
SRP_RPORT_LOST,
|
|
};
|
|
|
|
/**
|
|
* struct srp_rport - SRP initiator or target port
|
|
*
|
|
* Fields that are relevant for SRP initiator and SRP target drivers:
|
|
* @dev: Device associated with this rport.
|
|
* @port_id: 16-byte port identifier.
|
|
* @roles: Role of this port - initiator or target.
|
|
*
|
|
* Fields that are only relevant for SRP initiator drivers:
|
|
* @lld_data: LLD private data.
|
|
* @mutex: Protects against concurrent rport reconnect /
|
|
* fast_io_fail / dev_loss_tmo activity.
|
|
* @state: rport state.
|
|
* @reconnect_delay: Reconnect delay in seconds.
|
|
* @failed_reconnects: Number of failed reconnect attempts.
|
|
* @reconnect_work: Work structure used for scheduling reconnect attempts.
|
|
* @fast_io_fail_tmo: Fast I/O fail timeout in seconds.
|
|
* @dev_loss_tmo: Device loss timeout in seconds.
|
|
* @fast_io_fail_work: Work structure used for scheduling fast I/O fail work.
|
|
* @dev_loss_work: Work structure used for scheduling device loss work.
|
|
*/
|
|
struct srp_rport {
|
|
/* for initiator and target drivers */
|
|
|
|
struct device dev;
|
|
|
|
u8 port_id[16];
|
|
u8 roles;
|
|
|
|
/* for initiator drivers */
|
|
|
|
void *lld_data;
|
|
|
|
struct mutex mutex;
|
|
enum srp_rport_state state;
|
|
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
|
|
*
|
|
* Fields that are only relevant for SRP initiator drivers:
|
|
* @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.
|
|
* @rport_delete: Callback function that deletes an rport.
|
|
*
|
|
* Fields that are only relevant for SRP target drivers:
|
|
* @tsk_mgmt_response: Callback function for sending a task management response.
|
|
* @it_nexus_response: Callback function for processing an IT nexus response.
|
|
*/
|
|
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);
|
|
int (* it_nexus_response)(struct Scsi_Host *, u64, int);
|
|
};
|
|
|
|
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 *);
|
|
extern void srp_stop_rport_timers(struct srp_rport *rport);
|
|
|
|
/**
|
|
* srp_chkready() - evaluate the transport layer state before I/O
|
|
* @rport: SRP target port pointer.
|
|
*
|
|
* 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
|