[linux-2.6-block.git] / drivers / target / tcm_fc / tcm_fc.h

/*
 * Copyright (c) 2010 Cisco Systems, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */
#ifndef __TCM_FC_H__
#define __TCM_FC_H__

#define FT_VERSION "0.4"

#define FT_NAMELEN 32		/* length of ASCII WWPNs including pad */
#define FT_TPG_NAMELEN 32	/* max length of TPG name */
#define FT_LUN_NAMELEN 32	/* max length of LUN name */
#define TCM_FC_DEFAULT_TAGS 512	/* tags used for per-session preallocation */

struct ft_transport_id {
	__u8	format;
	__u8	__resvd1[7];
	__u8	wwpn[8];
	__u8	__resvd2[8];
} __attribute__((__packed__));

/*
 * Session (remote port).
 */
struct ft_sess {
	u32 port_id;			/* for hash lookup use only */
	u32 params;
	u16 max_frame;			/* maximum frame size */
	u64 port_name;			/* port name for transport ID */
	struct ft_tport *tport;
	struct se_session *se_sess;
	struct hlist_node hash;		/* linkage in ft_sess_hash table */
	struct rcu_head rcu;
	struct kref kref;		/* ref for hash and outstanding I/Os */
};

/*
 * Hash table of sessions per local port.
 * Hash lookup by remote port FC_ID.
 */
#define	FT_SESS_HASH_BITS	6
#define	FT_SESS_HASH_SIZE	(1 << FT_SESS_HASH_BITS)

/*
 * Per local port data.
 * This is created only after a TPG exists that allows target function
 * for the local port.  If the TPG exists, this is allocated when
 * we're notified that the local port has been created, or when
 * the first PRLI provider callback is received.
 */
struct ft_tport {
	struct fc_lport *lport;
	struct ft_tpg *tpg;		/* NULL if TPG deleted before tport */
	u32	sess_count;		/* number of sessions in hash */
	struct rcu_head rcu;
	struct hlist_head hash[FT_SESS_HASH_SIZE];	/* list of sessions */
};

/*
 * Node ID and authentication.
 */
struct ft_node_auth {
	u64	port_name;
	u64	node_name;
};

/*
 * Node ACL for FC remote port session.
 */
struct ft_node_acl {
	struct se_node_acl se_node_acl;
	struct ft_node_auth node_auth;
};

struct ft_lun {
	u32 index;
	char name[FT_LUN_NAMELEN];
};

/*
 * Target portal group (local port).
 */
struct ft_tpg {
	u32 index;
	struct ft_lport_wwn *lport_wwn;
	struct ft_tport *tport;		/* active tport or NULL */
	struct list_head lun_list;	/* head of LUNs */
	struct se_portal_group se_tpg;
	struct workqueue_struct *workqueue;
};

struct ft_lport_wwn {
	u64 wwpn;
	char name[FT_NAMELEN];
	struct list_head ft_wwn_node;
	struct ft_tpg *tpg;
	struct se_wwn se_wwn;
};

/*
 * Commands
 */
struct ft_cmd {
	struct ft_sess *sess;		/* session held for cmd */
	struct fc_seq *seq;		/* sequence in exchange mgr */
	struct se_cmd se_cmd;		/* Local TCM I/O descriptor */
	struct fc_frame *req_frame;
	u32 write_data_len;		/* data received on writes */
	struct work_struct work;
	/* Local sense buffer */
	unsigned char ft_sense_buffer[TRANSPORT_SENSE_BUFFER];
	u32 was_ddp_setup:1;		/* Set only if ddp is setup */
	u32 aborted:1;			/* Set if aborted by reset or timeout */
	struct scatterlist *sg;		/* Set only if DDP is setup */
	u32 sg_cnt;			/* No. of item in scatterlist */
};

extern struct mutex ft_lport_lock;
extern struct fc4_prov ft_prov;
extern unsigned int ft_debug_logging;

/*
 * Fabric methods.
 */

/*
 * Session ops.
 */
void ft_sess_put(struct ft_sess *);
int ft_sess_shutdown(struct se_session *);
void ft_sess_close(struct se_session *);
u32 ft_sess_get_index(struct se_session *);
u32 ft_sess_get_port_name(struct se_session *, unsigned char *, u32);

void ft_lport_add(struct fc_lport *, void *);
void ft_lport_del(struct fc_lport *, void *);
int ft_lport_notify(struct notifier_block *, unsigned long, void *);

/*
 * IO methods.
 */
int ft_check_stop_free(struct se_cmd *);
void ft_release_cmd(struct se_cmd *);
int ft_queue_status(struct se_cmd *);
int ft_queue_data_in(struct se_cmd *);
int ft_write_pending(struct se_cmd *);
int ft_write_pending_status(struct se_cmd *);
int ft_get_cmd_state(struct se_cmd *);
void ft_queue_tm_resp(struct se_cmd *);
void ft_aborted_task(struct se_cmd *);

/*
 * other internal functions.
 */
void ft_recv_req(struct ft_sess *, struct fc_frame *);
struct ft_tpg *ft_lport_find_tpg(struct fc_lport *);

void ft_recv_write_data(struct ft_cmd *, struct fc_frame *);
void ft_dump_cmd(struct ft_cmd *, const char *caller);

ssize_t ft_format_wwn(char *, size_t, u64);

/*
 * Underlying HW specific helper function
 */
void ft_invl_hw_context(struct ft_cmd *);

#endif /* __TCM_FC_H__ */
Commit	Line	Data
3699d92a KP	1	/*
	2	* Copyright (c) 2010 Cisco Systems, Inc.
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms and conditions of the GNU General Public License,
	6	* version 2, as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; if not, write to the Free Software Foundation, Inc.,
	15	* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	16	*/
	17	#ifndef __TCM_FC_H__
	18	#define __TCM_FC_H__
	19
9765b1f3	20	#define FT_VERSION "0.4"
3699d92a KP	21
	22	#define FT_NAMELEN 32 /* length of ASCII WWPNs including pad */
	23	#define FT_TPG_NAMELEN 32 /* max length of TPG name */
	24	#define FT_LUN_NAMELEN 32 /* max length of LUN name */
5f544cfa	25	#define TCM_FC_DEFAULT_TAGS 512 /* tags used for per-session preallocation */
3699d92a	26
3699d92a KP	27	struct ft_transport_id {
	28	__u8 format;
	29	__u8 __resvd1[7];
	30	__u8 wwpn[8];
	31	__u8 __resvd2[8];
	32	} __attribute__((__packed__));
	33
	34	/*
	35	* Session (remote port).
	36	*/
	37	struct ft_sess {
	38	u32 port_id; /* for hash lookup use only */
	39	u32 params;
	40	u16 max_frame; /* maximum frame size */
	41	u64 port_name; /* port name for transport ID */
	42	struct ft_tport *tport;
	43	struct se_session *se_sess;
	44	struct hlist_node hash; /* linkage in ft_sess_hash table */
	45	struct rcu_head rcu;
	46	struct kref kref; /* ref for hash and outstanding I/Os */
	47	};
	48
	49	/*
	50	* Hash table of sessions per local port.
	51	* Hash lookup by remote port FC_ID.
	52	*/
	53	#define FT_SESS_HASH_BITS 6
	54	#define FT_SESS_HASH_SIZE (1 << FT_SESS_HASH_BITS)
	55
	56	/*
	57	* Per local port data.
	58	* This is created only after a TPG exists that allows target function
	59	* for the local port. If the TPG exists, this is allocated when
	60	* we're notified that the local port has been created, or when
	61	* the first PRLI provider callback is received.
	62	*/
	63	struct ft_tport {
	64	struct fc_lport *lport;
	65	struct ft_tpg tpg; / NULL if TPG deleted before tport */
	66	u32 sess_count; /* number of sessions in hash */
	67	struct rcu_head rcu;
	68	struct hlist_head hash[FT_SESS_HASH_SIZE]; /* list of sessions */
	69	};
	70
	71	/*
	72	* Node ID and authentication.
	73	*/
	74	struct ft_node_auth {
	75	u64 port_name;
	76	u64 node_name;
	77	};
	78
	79	/*
	80	* Node ACL for FC remote port session.
	81	*/
	82	struct ft_node_acl {
3699d92a	83	struct se_node_acl se_node_acl;
144bc4c2	84	struct ft_node_auth node_auth;
3699d92a KP	85	};
	86
	87	struct ft_lun {
	88	u32 index;
	89	char name[FT_LUN_NAMELEN];
	90	};
	91
	92	/*
	93	* Target portal group (local port).
	94	*/
	95	struct ft_tpg {
	96	u32 index;
705665da	97	struct ft_lport_wwn *lport_wwn;
3699d92a	98	struct ft_tport tport; / active tport or NULL */
3699d92a KP	99	struct list_head lun_list; /* head of LUNs */
3699d92a KP	100	struct se_portal_group se_tpg;
58fc73d1	101	struct workqueue_struct *workqueue;
3699d92a KP	102	};
3699d92a KP	103
705665da	104	struct ft_lport_wwn {
3699d92a KP	105	u64 wwpn;
3699d92a KP	106	char name[FT_NAMELEN];
705665da	107	struct list_head ft_wwn_node;
d242c1d7	108	struct ft_tpg *tpg;
705665da	109	struct se_wwn se_wwn;
3699d92a KP	110	};
3699d92a KP	111
3699d92a KP	112	/*
	113	* Commands
	114	*/
	115	struct ft_cmd {
3699d92a KP	116	struct ft_sess sess; / session held for cmd */
	117	struct fc_seq seq; / sequence in exchange mgr */
	118	struct se_cmd se_cmd; /* Local TCM I/O descriptor */
	119	struct fc_frame *req_frame;
3699d92a	120	u32 write_data_len; /* data received on writes */
58fc73d1	121	struct work_struct work;
3699d92a KP	122	/* Local sense buffer */
	123	unsigned char ft_sense_buffer[TRANSPORT_SENSE_BUFFER];
	124	u32 was_ddp_setup:1; /* Set only if ddp is setup */
e1c40382	125	u32 aborted:1; /* Set if aborted by reset or timeout */
3699d92a KP	126	struct scatterlist sg; / Set only if DDP is setup */
	127	u32 sg_cnt; /* No. of item in scatterlist */
	128	};
	129
3699d92a KP	130	extern struct mutex ft_lport_lock;
3699d92a KP	131	extern struct fc4_prov ft_prov;
1fa8f450	132	extern unsigned int ft_debug_logging;
3699d92a KP	133
	134	/*
	135	* Fabric methods.
	136	*/
	137
	138	/*
	139	* Session ops.
	140	*/
	141	void ft_sess_put(struct ft_sess *);
	142	int ft_sess_shutdown(struct se_session *);
	143	void ft_sess_close(struct se_session *);
3699d92a KP	144	u32 ft_sess_get_index(struct se_session *);
3699d92a KP	145	u32 ft_sess_get_port_name(struct se_session , unsigned char , u32);
3699d92a KP	146
	147	void ft_lport_add(struct fc_lport , void );
	148	void ft_lport_del(struct fc_lport , void );
	149	int ft_lport_notify(struct notifier_block , unsigned long, void );
	150
	151	/*
	152	* IO methods.
	153	*/
88dd9e26	154	int ft_check_stop_free(struct se_cmd *);
3699d92a KP	155	void ft_release_cmd(struct se_cmd *);
	156	int ft_queue_status(struct se_cmd *);
	157	int ft_queue_data_in(struct se_cmd *);
	158	int ft_write_pending(struct se_cmd *);
	159	int ft_write_pending_status(struct se_cmd *);
3699d92a	160	int ft_get_cmd_state(struct se_cmd *);
b79fafac	161	void ft_queue_tm_resp(struct se_cmd *);
131e6abc	162	void ft_aborted_task(struct se_cmd *);
3699d92a KP	163
	164	/*
	165	* other internal functions.
	166	*/
3699d92a KP	167	void ft_recv_req(struct ft_sess , struct fc_frame );
3699d92a KP	168	struct ft_tpg ft_lport_find_tpg(struct fc_lport );
3699d92a KP	169
	170	void ft_recv_write_data(struct ft_cmd , struct fc_frame );
	171	void ft_dump_cmd(struct ft_cmd , const char caller);
	172
	173	ssize_t ft_format_wwn(char *, size_t, u64);
	174
dcd998cc KP	175	/*
	176	* Underlying HW specific helper function
	177	*/
	178	void ft_invl_hw_context(struct ft_cmd *);
	179
3699d92a	180	#endif /* __TCM_FC_H__ */