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 #include <linux/types.h> 21 #include <target/target_core_base.h> 22 23 #define FT_VERSION "0.4" 24 25 #define FT_NAMELEN 32 /* length of ASCII WWPNs including pad */ 26 #define FT_TPG_NAMELEN 32 /* max length of TPG name */ 27 #define FT_LUN_NAMELEN 32 /* max length of LUN name */ 28 #define TCM_FC_DEFAULT_TAGS 512 /* tags used for per-session preallocation */ 29 30 struct ft_transport_id { 31 __u8 format; 32 __u8 __resvd1[7]; 33 __u8 wwpn[8]; 34 __u8 __resvd2[8]; 35 } __attribute__((__packed__)); 36 37 /* 38 * Session (remote port). 39 */ 40 struct ft_sess { 41 u32 port_id; /* for hash lookup use only */ 42 u32 params; 43 u16 max_frame; /* maximum frame size */ 44 u64 port_name; /* port name for transport ID */ 45 struct ft_tport *tport; 46 struct se_session *se_sess; 47 struct hlist_node hash; /* linkage in ft_sess_hash table */ 48 struct rcu_head rcu; 49 struct kref kref; /* ref for hash and outstanding I/Os */ 50 }; 51 52 /* 53 * Hash table of sessions per local port. 54 * Hash lookup by remote port FC_ID. 55 */ 56 #define FT_SESS_HASH_BITS 6 57 #define FT_SESS_HASH_SIZE (1 << FT_SESS_HASH_BITS) 58 59 /* 60 * Per local port data. 61 * This is created only after a TPG exists that allows target function 62 * for the local port. If the TPG exists, this is allocated when 63 * we're notified that the local port has been created, or when 64 * the first PRLI provider callback is received. 65 */ 66 struct ft_tport { 67 struct fc_lport *lport; 68 struct ft_tpg *tpg; /* NULL if TPG deleted before tport */ 69 u32 sess_count; /* number of sessions in hash */ 70 struct rcu_head rcu; 71 struct hlist_head hash[FT_SESS_HASH_SIZE]; /* list of sessions */ 72 }; 73 74 /* 75 * Node ID and authentication. 76 */ 77 struct ft_node_auth { 78 u64 port_name; 79 u64 node_name; 80 }; 81 82 /* 83 * Node ACL for FC remote port session. 84 */ 85 struct ft_node_acl { 86 struct se_node_acl se_node_acl; 87 struct ft_node_auth node_auth; 88 }; 89 90 struct ft_lun { 91 u32 index; 92 char name[FT_LUN_NAMELEN]; 93 }; 94 95 /* 96 * Target portal group (local port). 97 */ 98 struct ft_tpg { 99 u32 index; 100 struct ft_lport_wwn *lport_wwn; 101 struct ft_tport *tport; /* active tport or NULL */ 102 struct list_head lun_list; /* head of LUNs */ 103 struct se_portal_group se_tpg; 104 struct workqueue_struct *workqueue; 105 }; 106 107 struct ft_lport_wwn { 108 u64 wwpn; 109 char name[FT_NAMELEN]; 110 struct list_head ft_wwn_node; 111 struct ft_tpg *tpg; 112 struct se_wwn se_wwn; 113 }; 114 115 /* 116 * Commands 117 */ 118 struct ft_cmd { 119 struct ft_sess *sess; /* session held for cmd */ 120 struct fc_seq *seq; /* sequence in exchange mgr */ 121 struct se_cmd se_cmd; /* Local TCM I/O descriptor */ 122 struct fc_frame *req_frame; 123 u32 write_data_len; /* data received on writes */ 124 struct work_struct work; 125 /* Local sense buffer */ 126 unsigned char ft_sense_buffer[TRANSPORT_SENSE_BUFFER]; 127 u32 was_ddp_setup:1; /* Set only if ddp is setup */ 128 u32 aborted:1; /* Set if aborted by reset or timeout */ 129 struct scatterlist *sg; /* Set only if DDP is setup */ 130 u32 sg_cnt; /* No. of item in scatterlist */ 131 }; 132 133 extern struct mutex ft_lport_lock; 134 extern struct fc4_prov ft_prov; 135 extern unsigned int ft_debug_logging; 136 137 /* 138 * Fabric methods. 139 */ 140 141 /* 142 * Session ops. 143 */ 144 void ft_sess_put(struct ft_sess *); 145 void ft_sess_close(struct se_session *); 146 u32 ft_sess_get_index(struct se_session *); 147 u32 ft_sess_get_port_name(struct se_session *, unsigned char *, u32); 148 149 void ft_lport_add(struct fc_lport *, void *); 150 void ft_lport_del(struct fc_lport *, void *); 151 int ft_lport_notify(struct notifier_block *, unsigned long, void *); 152 153 /* 154 * IO methods. 155 */ 156 int ft_check_stop_free(struct se_cmd *); 157 void ft_release_cmd(struct se_cmd *); 158 int ft_queue_status(struct se_cmd *); 159 int ft_queue_data_in(struct se_cmd *); 160 int ft_write_pending(struct se_cmd *); 161 int ft_write_pending_status(struct se_cmd *); 162 int ft_get_cmd_state(struct se_cmd *); 163 void ft_queue_tm_resp(struct se_cmd *); 164 void ft_aborted_task(struct se_cmd *); 165 166 /* 167 * other internal functions. 168 */ 169 void ft_recv_req(struct ft_sess *, struct fc_frame *); 170 struct ft_tpg *ft_lport_find_tpg(struct fc_lport *); 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__ */ 183