Release 4.7 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 *);
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__ */
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