drivers/target/tcm_fc/tcm_fc.h

   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
  20 #define FT_VERSION "0.4"
  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 */
  25 #define TCM_FC_DEFAULT_TAGS 512 /* tags used for per-session preallocation */
  26
  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 {
  83         struct ft_node_auth node_auth;
  84         struct se_node_acl se_node_acl;
  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;
  97         struct ft_lport_wwn *lport_wwn;
  98         struct ft_tport *tport;         /* active tport or NULL */
  99         struct list_head lun_list;      /* head of LUNs */
 100         struct se_portal_group se_tpg;
 101         struct workqueue_struct *workqueue;
 102 };
 103
 104 struct ft_lport_wwn {
 105         u64 wwpn;
 106         char name[FT_NAMELEN];
 107         struct list_head ft_wwn_node;
 108         struct ft_tpg *tpg;
 109         struct se_wwn se_wwn;
 110 };
 111
 112 /*
 113  * Commands
 114  */
 115 struct ft_cmd {
 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;
 120         u32 write_data_len;             /* data received on writes */
 121         struct work_struct work;
 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 */
 125         u32 aborted:1;                  /* Set if aborted by reset or timeout */
 126         struct scatterlist *sg;         /* Set only if DDP is setup */
 127         u32 sg_cnt;                     /* No. of item in scatterlist */
 128 };
 129
 130 extern struct mutex ft_lport_lock;
 131 extern struct fc4_prov ft_prov;
 132 extern unsigned int ft_debug_logging;
 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 *);
 144 u32 ft_sess_get_index(struct se_session *);
 145 u32 ft_sess_get_port_name(struct se_session *, unsigned char *, u32);
 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  */
 154 int ft_check_stop_free(struct se_cmd *);
 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 *);
 160 u32 ft_get_task_tag(struct se_cmd *);
 161 int ft_get_cmd_state(struct se_cmd *);
 162 void ft_queue_tm_resp(struct se_cmd *);
 163 void ft_aborted_task(struct se_cmd *);
 164
 165 /*
 166  * other internal functions.
 167  */
 168 void ft_recv_req(struct ft_sess *, struct fc_frame *);
 169 struct ft_tpg *ft_lport_find_tpg(struct fc_lport *);
 170 struct ft_node_acl *ft_acl_get(struct ft_tpg *, struct fc_rport_priv *);
 171
 172 void ft_recv_write_data(struct ft_cmd *, struct fc_frame *);
 173 void ft_dump_cmd(struct ft_cmd *, const char *caller);
 174
 175 ssize_t ft_format_wwn(char *, size_t, u64);
 176
 177 /*
 178  * Underlying HW specific helper function
 179  */
 180 void ft_invl_hw_context(struct ft_cmd *);
 181
 182 #endif /* __TCM_FC_H__ */