[linux-2.6-block.git] / include / target / target_core_fabric.h

#ifndef TARGET_CORE_FABRIC_H
#define TARGET_CORE_FABRIC_H

struct target_core_fabric_ops {
	struct module *module;
	const char *name;
	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 *);
	/*
	 * Optionally used as a configfs tunable to determine when
	 * target-core should signal the PROTECT=1 feature bit for
	 * backends that don't support T10-PI, so that either fabric
	 * HW offload or target-core emulation performs the associated
	 * WRITE_STRIP and READ_INSERT operations.
	 */
	int (*tpg_check_prot_fabric_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 configfs_attribute **tfc_discovery_attrs;
	struct configfs_attribute **tfc_wwn_attrs;
	struct configfs_attribute **tfc_tpg_base_attrs;
	struct configfs_attribute **tfc_tpg_np_base_attrs;
	struct configfs_attribute **tfc_tpg_attrib_attrs;
	struct configfs_attribute **tfc_tpg_auth_attrs;
	struct configfs_attribute **tfc_tpg_param_attrs;
	struct configfs_attribute **tfc_tpg_nacl_base_attrs;
	struct configfs_attribute **tfc_tpg_nacl_attrib_attrs;
	struct configfs_attribute **tfc_tpg_nacl_auth_attrs;
	struct configfs_attribute **tfc_tpg_nacl_param_attrs;
};

int target_register_template(const struct target_core_fabric_ops *fo);
void target_unregister_template(const struct target_core_fabric_ops *fo);

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 *);
ssize_t	target_show_dynamic_sessions(struct se_portal_group *, char *);
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 *,
		const 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(const 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 */
Commit	Line	Data
c4795fb2 CH	1	#ifndef TARGET_CORE_FABRIC_H
c4795fb2 CH	2	#define TARGET_CORE_FABRIC_H
c66ac9db NB	3
c66ac9db NB	4	struct target_core_fabric_ops {
9ac8928e CH	5	struct module *module;
9ac8928e CH	6	const char *name;
c66ac9db	7	struct configfs_subsystem *tf_subsys;
c66ac9db NB	8	char (get_fabric_name)(void);
	9	u8 (get_fabric_proto_ident)(struct se_portal_group );
	10	char (tpg_get_wwn)(struct se_portal_group *);
	11	u16 (tpg_get_tag)(struct se_portal_group );
	12	u32 (tpg_get_default_depth)(struct se_portal_group );
	13	u32 (tpg_get_pr_transport_id)(struct se_portal_group ,
	14	struct se_node_acl *,
	15	struct t10_pr_registration , int ,
	16	unsigned char *);
	17	u32 (tpg_get_pr_transport_id_len)(struct se_portal_group ,
	18	struct se_node_acl *,
	19	struct t10_pr_registration , int );
	20	char (tpg_parse_pr_out_transport_id)(struct se_portal_group *,
	21	const char , u32 , char **);
	22	int (tpg_check_demo_mode)(struct se_portal_group );
	23	int (tpg_check_demo_mode_cache)(struct se_portal_group );
	24	int (tpg_check_demo_mode_write_protect)(struct se_portal_group );
	25	int (tpg_check_prod_mode_write_protect)(struct se_portal_group );
052605c6 NB	26	/*
	27	* Optionally used by fabrics to allow demo-mode login, but not
	28	* expose any TPG LUNs, and return 'not connected' in standard
	29	* inquiry response
	30	*/
	31	int (tpg_check_demo_mode_login_only)(struct se_portal_group );
38b57f82 NB	32	/*
	33	* Optionally used as a configfs tunable to determine when
	34	* target-core should signal the PROTECT=1 feature bit for
	35	* backends that don't support T10-PI, so that either fabric
	36	* HW offload or target-core emulation performs the associated
	37	* WRITE_STRIP and READ_INSERT operations.
	38	*/
	39	int (tpg_check_prot_fabric_only)(struct se_portal_group );
c66ac9db NB	40	struct se_node_acl (tpg_alloc_fabric_acl)(
	41	struct se_portal_group *);
	42	void (tpg_release_fabric_acl)(struct se_portal_group ,
	43	struct se_node_acl *);
	44	u32 (tpg_get_inst_index)(struct se_portal_group );
c66ac9db NB	45	/*
c66ac9db NB	46	* Optional to release struct se_cmd and fabric dependent allocated
88dd9e26 NB	47	* I/O descriptor in transport_cmd_check_stop().
	48	*
	49	* Returning 1 will signal a descriptor has been released.
	50	* Returning 0 will signal a descriptor has not been released.
c66ac9db	51	*/
88dd9e26	52	int (check_stop_free)(struct se_cmd );
35462975	53	void (release_cmd)(struct se_cmd );
4149268e	54	void (put_session)(struct se_session );
c66ac9db NB	55	/*
	56	* Called with spin_lock_bh(struct se_portal_group->session_lock held.
	57	*/
	58	int (shutdown_session)(struct se_session );
	59	void (close_session)(struct se_session );
c66ac9db NB	60	u32 (sess_get_index)(struct se_session );
	61	/*
	62	* Used only for SCSI fabrics that contain multi-value TransportIDs
	63	* (like iSCSI). All other SCSI fabrics should set this to NULL.
	64	*/
	65	u32 (sess_get_initiator_sid)(struct se_session ,
	66	unsigned char *, u32);
	67	int (write_pending)(struct se_cmd );
	68	int (write_pending_status)(struct se_cmd );
	69	void (set_default_node_attributes)(struct se_node_acl );
	70	u32 (get_task_tag)(struct se_cmd );
	71	int (get_cmd_state)(struct se_cmd );
c66ac9db NB	72	int (queue_data_in)(struct se_cmd );
c66ac9db NB	73	int (queue_status)(struct se_cmd );
b79fafac	74	void (queue_tm_rsp)(struct se_cmd );
131e6abc	75	void (aborted_task)(struct se_cmd );
c66ac9db NB	76	/*
	77	* fabric module calls for target_core_fabric_configfs.c
	78	*/
	79	struct se_wwn (fabric_make_wwn)(struct target_fabric_configfs *,
	80	struct config_group , const char );
	81	void (fabric_drop_wwn)(struct se_wwn );
	82	struct se_portal_group (fabric_make_tpg)(struct se_wwn *,
	83	struct config_group , const char );
	84	void (fabric_drop_tpg)(struct se_portal_group );
	85	int (fabric_post_link)(struct se_portal_group ,
	86	struct se_lun *);
	87	void (fabric_pre_unlink)(struct se_portal_group ,
	88	struct se_lun *);
	89	struct se_tpg_np (fabric_make_np)(struct se_portal_group *,
	90	struct config_group , const char );
	91	void (fabric_drop_np)(struct se_tpg_np );
	92	struct se_node_acl (fabric_make_nodeacl)(struct se_portal_group *,
	93	struct config_group , const char );
	94	void (fabric_drop_nodeacl)(struct se_node_acl );
9ac8928e CH	95
	96	struct configfs_attribute **tfc_discovery_attrs;
	97	struct configfs_attribute **tfc_wwn_attrs;
	98	struct configfs_attribute **tfc_tpg_base_attrs;
	99	struct configfs_attribute **tfc_tpg_np_base_attrs;
	100	struct configfs_attribute **tfc_tpg_attrib_attrs;
	101	struct configfs_attribute **tfc_tpg_auth_attrs;
	102	struct configfs_attribute **tfc_tpg_param_attrs;
	103	struct configfs_attribute **tfc_tpg_nacl_base_attrs;
	104	struct configfs_attribute **tfc_tpg_nacl_attrib_attrs;
	105	struct configfs_attribute **tfc_tpg_nacl_auth_attrs;
	106	struct configfs_attribute **tfc_tpg_nacl_param_attrs;
c66ac9db	107	};
c4795fb2	108
9ac8928e CH	109	int target_register_template(const struct target_core_fabric_ops *fo);
	110	void target_unregister_template(const struct target_core_fabric_ops *fo);
	111
e70beee7	112	struct se_session *transport_init_session(enum target_prot_op);
c0add7fd NB	113	int transport_alloc_session_tags(struct se_session *, unsigned int,
c0add7fd NB	114	unsigned int);
e70beee7 NB	115	struct se_session *transport_init_session_tags(unsigned int, unsigned int,
e70beee7 NB	116	enum target_prot_op);
c4795fb2 CH	117	void __transport_register_session(struct se_portal_group *,
	118	struct se_node_acl , struct se_session , void *);
	119	void transport_register_session(struct se_portal_group *,
	120	struct se_node_acl , struct se_session , void *);
41ac82b6	121	void target_get_session(struct se_session *);
33933a0e	122	void target_put_session(struct se_session *);
f8e471f9	123	ssize_t target_show_dynamic_sessions(struct se_portal_group , char );
c4795fb2	124	void transport_free_session(struct se_session *);
afb999ff	125	void target_put_nacl(struct se_node_acl *);
c4795fb2 CH	126	void transport_deregister_session_configfs(struct se_session *);
	127	void transport_deregister_session(struct se_session *);
	128
	129
9ac8928e CH	130	void transport_init_se_cmd(struct se_cmd *,
9ac8928e CH	131	const struct target_core_fabric_ops *,
c4795fb2	132	struct se_session , u32, int, int, unsigned char );
de103c93 CH	133	sense_reason_t transport_lookup_cmd_lun(struct se_cmd *, u32);
de103c93 CH	134	sense_reason_t target_setup_cmd_from_cdb(struct se_cmd , unsigned char );
a026757f NB	135	int target_submit_cmd_map_sgls(struct se_cmd , struct se_session ,
a026757f NB	136	unsigned char , unsigned char , u32, u32, int, int, int,
def2b339 NB	137	struct scatterlist , u32, struct scatterlist , u32,
def2b339 NB	138	struct scatterlist *, u32);
d6dfc868	139	int target_submit_cmd(struct se_cmd , struct se_session , unsigned char *,
a6360785	140	unsigned char *, u32, u32, int, int, int);
c7042cae	141	int target_submit_tmr(struct se_cmd se_cmd, struct se_session se_sess,
ea98d7f9	142	unsigned char *sense, u32 unpacked_lun,
c0974f89 NB	143	void *fabric_tmr_ptr, unsigned char tm_type,
c0974f89 NB	144	gfp_t, unsigned int, int);
c4795fb2	145	int transport_handle_cdb_direct(struct se_cmd *);
de103c93	146	sense_reason_t transport_generic_new_cmd(struct se_cmd *);
c4795fb2	147
70baf0ab	148	void target_execute_cmd(struct se_cmd *cmd);
c4795fb2	149
d5ddad41	150	int transport_generic_free_cmd(struct se_cmd *, int);
c4795fb2 CH	151
	152	bool transport_wait_for_tasks(struct se_cmd *);
	153	int transport_check_aborted_status(struct se_cmd *, int);
de103c93 CH	154	int transport_send_check_condition_and_sense(struct se_cmd *,
de103c93 CH	155	sense_reason_t, int);
20361e69	156	int target_get_sess_cmd(struct se_session , struct se_cmd , bool);
c4795fb2	157	int target_put_sess_cmd(struct se_session , struct se_cmd );
1c7b13fe	158	void target_sess_cmd_list_set_waiting(struct se_session *);
be646c2d	159	void target_wait_for_sess_cmds(struct se_session *);
c4795fb2 CH	160
	161	int core_alua_check_nonop_delay(struct se_cmd *);
	162
c8e31f26	163	int core_tmr_alloc_req(struct se_cmd , void , u8, gfp_t);
c4795fb2 CH	164	void core_tmr_release_req(struct se_tmr_req *);
c4795fb2 CH	165	int transport_generic_handle_tmr(struct se_cmd *);
de103c93	166	void transport_generic_request_failure(struct se_cmd *, sense_reason_t);
76dde50e	167	void __target_execute_cmd(struct se_cmd *);
c4795fb2 CH	168	int transport_lookup_tmr_lun(struct se_cmd *, u32);
c4795fb2 CH	169
b3fde035 TG	170	struct se_node_acl core_tpg_get_initiator_node_acl(struct se_portal_group tpg,
b3fde035 TG	171	unsigned char *);
c4795fb2 CH	172	struct se_node_acl core_tpg_check_initiator_node_acl(struct se_portal_group ,
	173	unsigned char *);
	174	void core_tpg_clear_object_luns(struct se_portal_group *);
	175	struct se_node_acl core_tpg_add_initiator_node_acl(struct se_portal_group ,
	176	struct se_node_acl , const char , u32);
	177	int core_tpg_del_initiator_node_acl(struct se_portal_group *,
	178	struct se_node_acl *, int);
	179	int core_tpg_set_initiator_node_queue_depth(struct se_portal_group *,
	180	unsigned char *, u32, int);
79e62fc3 AG	181	int core_tpg_set_initiator_node_tag(struct se_portal_group *,
79e62fc3 AG	182	struct se_node_acl , const char );
9ac8928e CH	183	int core_tpg_register(const struct target_core_fabric_ops *,
9ac8928e CH	184	struct se_wwn , struct se_portal_group , void *, int);
c4795fb2 CH	185	int core_tpg_deregister(struct se_portal_group *);
	186
	187	/* SAS helpers */
	188	u8 sas_get_fabric_proto_ident(struct se_portal_group *);
	189	u32 sas_get_pr_transport_id(struct se_portal_group , struct se_node_acl ,
	190	struct t10_pr_registration , int , unsigned char *);
	191	u32 sas_get_pr_transport_id_len(struct se_portal_group , struct se_node_acl ,
	192	struct t10_pr_registration , int );
	193	char sas_parse_pr_out_transport_id(struct se_portal_group , const char *,
	194	u32 , char *);
	195
	196	/* FC helpers */
	197	u8 fc_get_fabric_proto_ident(struct se_portal_group *);
	198	u32 fc_get_pr_transport_id(struct se_portal_group , struct se_node_acl ,
	199	struct t10_pr_registration , int , unsigned char *);
	200	u32 fc_get_pr_transport_id_len(struct se_portal_group , struct se_node_acl ,
	201	struct t10_pr_registration , int );
	202	char fc_parse_pr_out_transport_id(struct se_portal_group , const char *,
	203	u32 , char *);
	204
	205	/* iSCSI helpers */
	206	u8 iscsi_get_fabric_proto_ident(struct se_portal_group *);
	207	u32 iscsi_get_pr_transport_id(struct se_portal_group , struct se_node_acl ,
	208	struct t10_pr_registration , int , unsigned char *);
	209	u32 iscsi_get_pr_transport_id_len(struct se_portal_group , struct se_node_acl ,
	210	struct t10_pr_registration , int );
	211	char iscsi_parse_pr_out_transport_id(struct se_portal_group , const char *,
	212	u32 , char *);
	213
b3faa2e8 NB	214	/*
	215	* The LIO target core uses DMA_TO_DEVICE to mean that data is going
	216	* to the target (eg handling a WRITE) and DMA_FROM_DEVICE to mean
	217	* that data is coming from the target (eg handling a READ). However,
	218	* this is just the opposite of what we have to tell the DMA mapping
	219	* layer -- eg when handling a READ, the HBA will have to DMA the data
	220	* out of memory so it can send it to the initiator, which means we
	221	* need to use DMA_TO_DEVICE when we map the data.
	222	*/
	223	static inline enum dma_data_direction
	224	target_reverse_dma_direction(struct se_cmd *se_cmd)
	225	{
	226	if (se_cmd->se_cmd_flags & SCF_BIDI)
	227	return DMA_BIDIRECTIONAL;
	228
	229	switch (se_cmd->data_direction) {
	230	case DMA_TO_DEVICE:
	231	return DMA_FROM_DEVICE;
	232	case DMA_FROM_DEVICE:
	233	return DMA_TO_DEVICE;
	234	case DMA_NONE:
	235	default:
	236	return DMA_NONE;
	237	}
	238	}
	239
c4795fb2	240	#endif /* TARGET_CORE_FABRICH */