include/target/target_core

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This source file includes following definitions.
target_reverse_dma_direction
#ifndef TARGET_CORE_FABRIC_H
#define TARGET_CORE_FABRIC_H

struct target_core_fabric_ops {
        struct configfs_subsystem *tf_subsys;
        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 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 *);
        void (*release_cmd)(struct se_cmd *);
        void (*put_session)(struct se_session *);
        /*
         * Called with spin_lock_bh(struct se_portal_group->session_lock held.
         */
        int (*shutdown_session)(struct se_session *);
        void (*close_session)(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 *);
        void (*queue_tm_rsp)(struct se_cmd *);
        void (*aborted_task)(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 *);
};

struct se_session *transport_init_session(enum target_prot_op);
int transport_alloc_session_tags(struct se_session *, unsigned int,
                unsigned int);
struct se_session *transport_init_session_tags(unsigned int, unsigned int,
                enum target_prot_op);
void    __transport_register_session(struct se_portal_group *,
                struct se_node_acl *, struct se_session *, void *);
void    transport_register_session(struct se_portal_group *,
                struct se_node_acl *, struct se_session *, void *);
void    target_get_session(struct se_session *);
void    target_put_session(struct se_session *);
void    transport_free_session(struct se_session *);
void    target_put_nacl(struct se_node_acl *);
void    transport_deregister_session_configfs(struct se_session *);
void    transport_deregister_session(struct se_session *);


void    transport_init_se_cmd(struct se_cmd *, struct target_core_fabric_ops *,
                struct se_session *, u32, int, int, unsigned char *);
sense_reason_t transport_lookup_cmd_lun(struct se_cmd *, u32);
sense_reason_t target_setup_cmd_from_cdb(struct se_cmd *, unsigned char *);
int     target_submit_cmd_map_sgls(struct se_cmd *, struct se_session *,
                unsigned char *, unsigned char *, u32, u32, int, int, int,
                struct scatterlist *, u32, struct scatterlist *, u32,
                struct scatterlist *, u32);
int     target_submit_cmd(struct se_cmd *, struct se_session *, unsigned char *,
                unsigned char *, u32, u32, int, int, int);
int     target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
                unsigned char *sense, u32 unpacked_lun,
                void *fabric_tmr_ptr, unsigned char tm_type,
                gfp_t, unsigned int, int);
int     transport_handle_cdb_direct(struct se_cmd *);
sense_reason_t  transport_generic_new_cmd(struct se_cmd *);

void    target_execute_cmd(struct se_cmd *cmd);

int     transport_generic_free_cmd(struct se_cmd *, int);

bool    transport_wait_for_tasks(struct se_cmd *);
int     transport_check_aborted_status(struct se_cmd *, int);
int     transport_send_check_condition_and_sense(struct se_cmd *,
                sense_reason_t, int);
int     target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
int     target_put_sess_cmd(struct se_session *, struct se_cmd *);
void    target_sess_cmd_list_set_waiting(struct se_session *);
void    target_wait_for_sess_cmds(struct se_session *);

int     core_alua_check_nonop_delay(struct se_cmd *);

int     core_tmr_alloc_req(struct se_cmd *, void *, u8, gfp_t);
void    core_tmr_release_req(struct se_tmr_req *);
int     transport_generic_handle_tmr(struct se_cmd *);
void    transport_generic_request_failure(struct se_cmd *, sense_reason_t);
void    __target_execute_cmd(struct se_cmd *);
int     transport_lookup_tmr_lun(struct se_cmd *, u32);

struct se_node_acl *core_tpg_get_initiator_node_acl(struct se_portal_group *tpg,
                unsigned char *);
struct se_node_acl *core_tpg_check_initiator_node_acl(struct se_portal_group *,
                unsigned char *);
void    core_tpg_clear_object_luns(struct se_portal_group *);
struct se_node_acl *core_tpg_add_initiator_node_acl(struct se_portal_group *,
                struct se_node_acl *, const char *, u32);
int     core_tpg_del_initiator_node_acl(struct se_portal_group *,
                struct se_node_acl *, int);
int     core_tpg_set_initiator_node_queue_depth(struct se_portal_group *,
                unsigned char *, u32, int);
int     core_tpg_set_initiator_node_tag(struct se_portal_group *,
                struct se_node_acl *, const char *);
int     core_tpg_register(struct target_core_fabric_ops *, struct se_wwn *,
                struct se_portal_group *, void *, int);
int     core_tpg_deregister(struct se_portal_group *);

/* SAS helpers */
u8      sas_get_fabric_proto_ident(struct se_portal_group *);
u32     sas_get_pr_transport_id(struct se_portal_group *, struct se_node_acl *,
                struct t10_pr_registration *, int *, unsigned char *);
u32     sas_get_pr_transport_id_len(struct se_portal_group *, struct se_node_acl *,
                struct t10_pr_registration *, int *);
char    *sas_parse_pr_out_transport_id(struct se_portal_group *, const char *,
                u32 *, char **);

/* FC helpers */
u8      fc_get_fabric_proto_ident(struct se_portal_group *);
u32     fc_get_pr_transport_id(struct se_portal_group *, struct se_node_acl *,
                struct t10_pr_registration *, int *, unsigned char *);
u32     fc_get_pr_transport_id_len(struct se_portal_group *, struct se_node_acl *,
                struct t10_pr_registration *, int *);
char    *fc_parse_pr_out_transport_id(struct se_portal_group *, const char *,
                u32 *, char **);

/* iSCSI helpers */
u8      iscsi_get_fabric_proto_ident(struct se_portal_group *);
u32     iscsi_get_pr_transport_id(struct se_portal_group *, struct se_node_acl *,
                struct t10_pr_registration *, int *, unsigned char *);
u32     iscsi_get_pr_transport_id_len(struct se_portal_group *, struct se_node_acl *,
                struct t10_pr_registration *, int *);
char    *iscsi_parse_pr_out_transport_id(struct se_portal_group *, const char *,
                u32 *, char **);

/*
 * The LIO target core uses DMA_TO_DEVICE to mean that data is going
 * to the target (eg handling a WRITE) and DMA_FROM_DEVICE to mean
 * that data is coming from the target (eg handling a READ).  However,
 * this is just the opposite of what we have to tell the DMA mapping
 * layer -- eg when handling a READ, the HBA will have to DMA the data
 * out of memory so it can send it to the initiator, which means we
 * need to use DMA_TO_DEVICE when we map the data.
 */
static inline enum dma_data_direction
target_reverse_dma_direction(struct se_cmd *se_cmd)
{
        if (se_cmd->se_cmd_flags & SCF_BIDI)
                return DMA_BIDIRECTIONAL;

        switch (se_cmd->data_direction) {
        case DMA_TO_DEVICE:
                return DMA_FROM_DEVICE;
        case DMA_FROM_DEVICE:
                return DMA_TO_DEVICE;
        case DMA_NONE:
        default:
                return DMA_NONE;
        }
}

#endif /* TARGET_CORE_FABRICH */
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root/include/target/target_core_fabric.h

DEFINITIONS
