/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (c) 2010 Cisco Systems, Inc.
 */
#ifndef __TCM_FC_H__
#define __TCM_FC_H__

#include <linux/types.h>
#include <target/target_core_base.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 *);
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__ */