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 "0.3"
  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
  26 /*
  27  * Debug options.
  28  */
  29 #define FT_DEBUG_CONF   0x01    /* configuration messages */
  30 #define FT_DEBUG_SESS   0x02    /* session messages */
  31 #define FT_DEBUG_TM     0x04    /* TM operations */
  32 #define FT_DEBUG_IO     0x08    /* I/O commands */
  33 #define FT_DEBUG_DATA   0x10    /* Data transfer */
  34
  35 extern unsigned int ft_debug_logging;   /* debug options */
  36
  37 #define FT_DEBUG(mask, fmt, args...)                                    \
  38         do {                                                            \
  39                 if (ft_debug_logging & (mask))                          \
  40                         printk(KERN_INFO "tcm_fc: %s: " fmt,            \
  41                                 __func__, ##args);                      \
  42         } while (0)
  43
  44 #define FT_CONF_DBG(fmt, args...)       FT_DEBUG(FT_DEBUG_CONF, fmt, ##args)
  45 #define FT_SESS_DBG(fmt, args...)       FT_DEBUG(FT_DEBUG_SESS, fmt, ##args)
  46 #define FT_TM_DBG(fmt, args...)         FT_DEBUG(FT_DEBUG_TM, fmt, ##args)
  47 #define FT_IO_DBG(fmt, args...)         FT_DEBUG(FT_DEBUG_IO, fmt, ##args)
  48 #define FT_DATA_DBG(fmt, args...)       FT_DEBUG(FT_DEBUG_DATA, fmt, ##args)
  49
  50 struct ft_transport_id {
  51         __u8    format;
  52         __u8    __resvd1[7];
  53         __u8    wwpn[8];
  54         __u8    __resvd2[8];
  55 } __attribute__((__packed__));
  56
  57 /*
  58  * Session (remote port).
  59  */
  60 struct ft_sess {
  61         u32 port_id;                    /* for hash lookup use only */
  62         u32 params;
  63         u16 max_frame;                  /* maximum frame size */
  64         u64 port_name;                  /* port name for transport ID */
  65         struct ft_tport *tport;
  66         struct se_session *se_sess;
  67         struct hlist_node hash;         /* linkage in ft_sess_hash table */
  68         struct rcu_head rcu;
  69         struct kref kref;               /* ref for hash and outstanding I/Os */
  70 };
  71
  72 /*
  73  * Hash table of sessions per local port.
  74  * Hash lookup by remote port FC_ID.
  75  */
  76 #define FT_SESS_HASH_BITS       6
  77 #define FT_SESS_HASH_SIZE       (1 << FT_SESS_HASH_BITS)
  78
  79 /*
  80  * Per local port data.
  81  * This is created only after a TPG exists that allows target function
  82  * for the local port.  If the TPG exists, this is allocated when
  83  * we're notified that the local port has been created, or when
  84  * the first PRLI provider callback is received.
  85  */
  86 struct ft_tport {
  87         struct fc_lport *lport;
  88         struct ft_tpg *tpg;             /* NULL if TPG deleted before tport */
  89         u32     sess_count;             /* number of sessions in hash */
  90         struct rcu_head rcu;
  91         struct hlist_head hash[FT_SESS_HASH_SIZE];      /* list of sessions */
  92 };
  93
  94 /*
  95  * Node ID and authentication.
  96  */
  97 struct ft_node_auth {
  98         u64     port_name;
  99         u64     node_name;
 100 };
 101
 102 /*
 103  * Node ACL for FC remote port session.
 104  */
 105 struct ft_node_acl {
 106         struct ft_node_auth node_auth;
 107         struct se_node_acl se_node_acl;
 108 };
 109
 110 struct ft_lun {
 111         u32 index;
 112         char name[FT_LUN_NAMELEN];
 113 };
 114
 115 /*
 116  * Target portal group (local port).
 117  */
 118 struct ft_tpg {
 119         u32 index;
 120         struct ft_lport_acl *lport_acl;
 121         struct ft_tport *tport;         /* active tport or NULL */
 122         struct list_head list;          /* linkage in ft_lport_acl tpg_list */
 123         struct list_head lun_list;      /* head of LUNs */
 124         struct se_portal_group se_tpg;
 125         struct task_struct *thread;     /* processing thread */
 126         struct se_queue_obj qobj;       /* queue for processing thread */
 127 };
 128
 129 struct ft_lport_acl {
 130         u64 wwpn;
 131         char name[FT_NAMELEN];
 132         struct list_head list;
 133         struct list_head tpg_list;
 134         struct se_wwn fc_lport_wwn;
 135 };
 136
 137 enum ft_cmd_state {
 138         FC_CMD_ST_NEW = 0,
 139         FC_CMD_ST_REJ
 140 };
 141
 142 /*
 143  * Commands
 144  */
 145 struct ft_cmd {
 146         enum ft_cmd_state state;
 147         u16 lun;                        /* LUN from request */
 148         struct ft_sess *sess;           /* session held for cmd */
 149         struct fc_seq *seq;             /* sequence in exchange mgr */
 150         struct se_cmd se_cmd;           /* Local TCM I/O descriptor */
 151         struct fc_frame *req_frame;
 152         unsigned char *cdb;             /* pointer to CDB inside frame */
 153         u32 write_data_len;             /* data received on writes */
 154         struct se_queue_req se_req;
 155         /* Local sense buffer */
 156         unsigned char ft_sense_buffer[TRANSPORT_SENSE_BUFFER];
 157         u32 was_ddp_setup:1;            /* Set only if ddp is setup */
 158         struct scatterlist *sg;         /* Set only if DDP is setup */
 159         u32 sg_cnt;                     /* No. of item in scatterlist */
 160 };
 161
 162 extern struct list_head ft_lport_list;
 163 extern struct mutex ft_lport_lock;
 164 extern struct fc4_prov ft_prov;
 165 extern struct target_fabric_configfs *ft_configfs;
 166
 167 /*
 168  * Fabric methods.
 169  */
 170
 171 /*
 172  * Session ops.
 173  */
 174 void ft_sess_put(struct ft_sess *);
 175 int ft_sess_shutdown(struct se_session *);
 176 void ft_sess_close(struct se_session *);
 177 void ft_sess_stop(struct se_session *, int, int);
 178 int ft_sess_logged_in(struct se_session *);
 179 u32 ft_sess_get_index(struct se_session *);
 180 u32 ft_sess_get_port_name(struct se_session *, unsigned char *, u32);
 181 void ft_sess_set_erl0(struct se_session *);
 182
 183 void ft_lport_add(struct fc_lport *, void *);
 184 void ft_lport_del(struct fc_lport *, void *);
 185 int ft_lport_notify(struct notifier_block *, unsigned long, void *);
 186
 187 /*
 188  * IO methods.
 189  */
 190 void ft_check_stop_free(struct se_cmd *);
 191 void ft_release_cmd(struct se_cmd *);
 192 int ft_queue_status(struct se_cmd *);
 193 int ft_queue_data_in(struct se_cmd *);
 194 int ft_write_pending(struct se_cmd *);
 195 int ft_write_pending_status(struct se_cmd *);
 196 u32 ft_get_task_tag(struct se_cmd *);
 197 int ft_get_cmd_state(struct se_cmd *);
 198 void ft_new_cmd_failure(struct se_cmd *);
 199 int ft_queue_tm_resp(struct se_cmd *);
 200 int ft_is_state_remove(struct se_cmd *);
 201
 202 /*
 203  * other internal functions.
 204  */
 205 int ft_thread(void *);
 206 void ft_recv_req(struct ft_sess *, struct fc_frame *);
 207 struct ft_tpg *ft_lport_find_tpg(struct fc_lport *);
 208 struct ft_node_acl *ft_acl_get(struct ft_tpg *, struct fc_rport_priv *);
 209
 210 void ft_recv_write_data(struct ft_cmd *, struct fc_frame *);
 211 void ft_dump_cmd(struct ft_cmd *, const char *caller);
 212
 213 ssize_t ft_format_wwn(char *, size_t, u64);
 214
 215 #endif /* __TCM_FC_H__ */