![Nicholas Bellinger](/assets/img/avatar_default.png)
This patch adds the initial pieces of generic active I/O shutdown logic. This is intended to be a 'opt-in' feature for fabric modules that includes the following functions to provide a mechinism for fabric modules to track se_cmd via se_session->sess_cmd_list: *) target_get_sess_cmd() - Add se_cmd to sess->sess_cmd_list, called from fabric module incoming I/O path. *) target_put_sess_cmd() - Check for completion or drop se_cmd from ->sess_cmd_list *) target_splice_sess_cmd_list() - Splice active I/O list from ->sess_cmd_list to ->sess_wait_list, can called with HW fabric lock held. *) target_wait_for_sess_cmds() - Walk ->sess_wait_list waiting on individual ->cmd_wait_comp. Optional transport_wait_for_tasks() call. target_splice_sess_cmd_list() is allowed to be called under HW fabric lock, and performs the splice into se_sess->sess_wait_list and set se_cmd->cmd_wait_set. Then target_wait_for_sess_cmds() walks the list waiting for individual target_put_sess_cmd() fabric callbacks to complete. It also adds TFO->check_release_cmd() to split the completion and memory release calls, where a fabric module uses target_put_sess_cmd() to check for I/O completion during session shutdown. This is currently pushed out into fabric modules as current fabric code may sleep here waiting for TFO->check_stop_free() to complete in main response path, and because target_wait_for_sess_cmds() calling TFO->release_cmd() to free fabric descriptor memory directly. Cc: Christoph Hellwig <hch@lst.de> Cc: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
106 lines
4.1 KiB
C
106 lines
4.1 KiB
C
/* Defined in target_core_configfs.h */
|
|
struct target_fabric_configfs;
|
|
|
|
struct target_core_fabric_ops {
|
|
struct configfs_subsystem *tf_subsys;
|
|
/*
|
|
* Optional to signal struct se_task->task_sg[] padding entries
|
|
* for scatterlist chaining using transport_do_task_sg_link(),
|
|
* disabled by default
|
|
*/
|
|
bool task_sg_chaining;
|
|
char *(*get_fabric_name)(void);
|
|
u8 (*get_fabric_proto_ident)(struct se_portal_group *);
|
|
char *(*tpg_get_wwn)(struct se_portal_group *);
|
|
u16 (*tpg_get_tag)(struct se_portal_group *);
|
|
u32 (*tpg_get_default_depth)(struct se_portal_group *);
|
|
u32 (*tpg_get_pr_transport_id)(struct se_portal_group *,
|
|
struct se_node_acl *,
|
|
struct t10_pr_registration *, int *,
|
|
unsigned char *);
|
|
u32 (*tpg_get_pr_transport_id_len)(struct se_portal_group *,
|
|
struct se_node_acl *,
|
|
struct t10_pr_registration *, int *);
|
|
char *(*tpg_parse_pr_out_transport_id)(struct se_portal_group *,
|
|
const char *, u32 *, char **);
|
|
int (*tpg_check_demo_mode)(struct se_portal_group *);
|
|
int (*tpg_check_demo_mode_cache)(struct se_portal_group *);
|
|
int (*tpg_check_demo_mode_write_protect)(struct se_portal_group *);
|
|
int (*tpg_check_prod_mode_write_protect)(struct se_portal_group *);
|
|
/*
|
|
* Optionally used by fabrics to allow demo-mode login, but not
|
|
* expose any TPG LUNs, and return 'not connected' in standard
|
|
* inquiry response
|
|
*/
|
|
int (*tpg_check_demo_mode_login_only)(struct se_portal_group *);
|
|
struct se_node_acl *(*tpg_alloc_fabric_acl)(
|
|
struct se_portal_group *);
|
|
void (*tpg_release_fabric_acl)(struct se_portal_group *,
|
|
struct se_node_acl *);
|
|
u32 (*tpg_get_inst_index)(struct se_portal_group *);
|
|
/*
|
|
* Optional function pointer for TCM to perform command map
|
|
* from TCM processing thread context, for those struct se_cmd
|
|
* initially allocated in interrupt context.
|
|
*/
|
|
int (*new_cmd_map)(struct se_cmd *);
|
|
/*
|
|
* Optional to release struct se_cmd and fabric dependent allocated
|
|
* I/O descriptor in transport_cmd_check_stop().
|
|
*
|
|
* Returning 1 will signal a descriptor has been released.
|
|
* Returning 0 will signal a descriptor has not been released.
|
|
*/
|
|
int (*check_stop_free)(struct se_cmd *);
|
|
/*
|
|
* Optional check for active I/O shutdown
|
|
*/
|
|
int (*check_release_cmd)(struct se_cmd *);
|
|
void (*release_cmd)(struct se_cmd *);
|
|
/*
|
|
* Called with spin_lock_bh(struct se_portal_group->session_lock held.
|
|
*/
|
|
int (*shutdown_session)(struct se_session *);
|
|
void (*close_session)(struct se_session *);
|
|
void (*stop_session)(struct se_session *, int, int);
|
|
void (*fall_back_to_erl0)(struct se_session *);
|
|
int (*sess_logged_in)(struct se_session *);
|
|
u32 (*sess_get_index)(struct se_session *);
|
|
/*
|
|
* Used only for SCSI fabrics that contain multi-value TransportIDs
|
|
* (like iSCSI). All other SCSI fabrics should set this to NULL.
|
|
*/
|
|
u32 (*sess_get_initiator_sid)(struct se_session *,
|
|
unsigned char *, u32);
|
|
int (*write_pending)(struct se_cmd *);
|
|
int (*write_pending_status)(struct se_cmd *);
|
|
void (*set_default_node_attributes)(struct se_node_acl *);
|
|
u32 (*get_task_tag)(struct se_cmd *);
|
|
int (*get_cmd_state)(struct se_cmd *);
|
|
int (*queue_data_in)(struct se_cmd *);
|
|
int (*queue_status)(struct se_cmd *);
|
|
int (*queue_tm_rsp)(struct se_cmd *);
|
|
u16 (*set_fabric_sense_len)(struct se_cmd *, u32);
|
|
u16 (*get_fabric_sense_len)(void);
|
|
int (*is_state_remove)(struct se_cmd *);
|
|
/*
|
|
* fabric module calls for target_core_fabric_configfs.c
|
|
*/
|
|
struct se_wwn *(*fabric_make_wwn)(struct target_fabric_configfs *,
|
|
struct config_group *, const char *);
|
|
void (*fabric_drop_wwn)(struct se_wwn *);
|
|
struct se_portal_group *(*fabric_make_tpg)(struct se_wwn *,
|
|
struct config_group *, const char *);
|
|
void (*fabric_drop_tpg)(struct se_portal_group *);
|
|
int (*fabric_post_link)(struct se_portal_group *,
|
|
struct se_lun *);
|
|
void (*fabric_pre_unlink)(struct se_portal_group *,
|
|
struct se_lun *);
|
|
struct se_tpg_np *(*fabric_make_np)(struct se_portal_group *,
|
|
struct config_group *, const char *);
|
|
void (*fabric_drop_np)(struct se_tpg_np *);
|
|
struct se_node_acl *(*fabric_make_nodeacl)(struct se_portal_group *,
|
|
struct config_group *, const char *);
|
|
void (*fabric_drop_nodeacl)(struct se_node_acl *);
|
|
};
|