drivers/target/target_core_alua.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef TARGET_CORE_ALUA_H
   3 #define TARGET_CORE_ALUA_H
   4
   5 #include <target/target_core_base.h>
   6
   7 /*
   8  * INQUIRY response data, TPGS Field
   9  *
  10  * from spc4r17 section 6.4.2 Table 135
  11  */
  12 #define TPGS_NO_ALUA                            0x00
  13 #define TPGS_IMPLICIT_ALUA                      0x10
  14 #define TPGS_EXPLICIT_ALUA                      0x20
  15
  16 /*
  17  * ASYMMETRIC ACCESS STATE field
  18  *
  19  * from spc4r36j section 6.37 Table 307
  20  */
  21 #define ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED      0x0
  22 #define ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED  0x1
  23 #define ALUA_ACCESS_STATE_STANDBY               0x2
  24 #define ALUA_ACCESS_STATE_UNAVAILABLE           0x3
  25 #define ALUA_ACCESS_STATE_LBA_DEPENDENT         0x4
  26 #define ALUA_ACCESS_STATE_OFFLINE               0xe
  27 #define ALUA_ACCESS_STATE_TRANSITION            0xf
  28
  29 /*
  30  * from spc4r36j section 6.37 Table 306
  31  */
  32 #define ALUA_T_SUP              0x80
  33 #define ALUA_O_SUP              0x40
  34 #define ALUA_LBD_SUP            0x10
  35 #define ALUA_U_SUP              0x08
  36 #define ALUA_S_SUP              0x04
  37 #define ALUA_AN_SUP             0x02
  38 #define ALUA_AO_SUP             0x01
  39
  40 /*
  41  * REPORT_TARGET_PORT_GROUP STATUS CODE
  42  *
  43  * from spc4r17 section 6.27 Table 246
  44  */
  45 #define ALUA_STATUS_NONE                                0x00
  46 #define ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG            0x01
  47 #define ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA            0x02
  48
  49 /*
  50  * From spc4r17, Table D.1: ASC and ASCQ Assignement
  51  */
  52 #define ASCQ_04H_ALUA_STATE_TRANSITION                  0x0a
  53 #define ASCQ_04H_ALUA_TG_PT_STANDBY                     0x0b
  54 #define ASCQ_04H_ALUA_TG_PT_UNAVAILABLE                 0x0c
  55 #define ASCQ_04H_ALUA_OFFLINE                           0x12
  56
  57 /*
  58  * Used as the default for Active/NonOptimized delay (in milliseconds)
  59  * This can also be changed via configfs on a per target port group basis..
  60  */
  61 #define ALUA_DEFAULT_NONOP_DELAY_MSECS                  100
  62 #define ALUA_MAX_NONOP_DELAY_MSECS                      10000 /* 10 seconds */
  63 /*
  64  * Used for implicit and explicit ALUA transitional delay, that is disabled
  65  * by default, and is intended to be used for debugging client side ALUA code.
  66  */
  67 #define ALUA_DEFAULT_TRANS_DELAY_MSECS                  0
  68 #define ALUA_MAX_TRANS_DELAY_MSECS                      30000 /* 30 seconds */
  69 /*
  70  * Used for the recommended application client implicit transition timeout
  71  * in seconds, returned by the REPORT_TARGET_PORT_GROUPS w/ extended header.
  72  */
  73 #define ALUA_DEFAULT_IMPLICIT_TRANS_SECS                        0
  74 #define ALUA_MAX_IMPLICIT_TRANS_SECS                    255
  75 /*
  76  * Used by core_alua_update_tpg_primary_metadata() and
  77  * core_alua_update_tpg_secondary_metadata()
  78  */
  79 #define ALUA_METADATA_PATH_LEN                          512
  80 /*
  81  * Used by core_alua_update_tpg_secondary_metadata()
  82  */
  83 #define ALUA_SECONDARY_METADATA_WWN_LEN                 256
  84
  85 /* Used by core_alua_update_tpg_(primary,secondary)_metadata */
  86 #define ALUA_MD_BUF_LEN                                 1024
  87
  88 extern struct kmem_cache *t10_alua_lu_gp_cache;
  89 extern struct kmem_cache *t10_alua_lu_gp_mem_cache;
  90 extern struct kmem_cache *t10_alua_tg_pt_gp_cache;
  91 extern struct kmem_cache *t10_alua_lba_map_cache;
  92 extern struct kmem_cache *t10_alua_lba_map_mem_cache;
  93
  94 extern sense_reason_t target_emulate_report_target_port_groups(struct se_cmd *);
  95 extern sense_reason_t target_emulate_set_target_port_groups(struct se_cmd *);
  96 extern sense_reason_t target_emulate_report_referrals(struct se_cmd *);
  97 extern int core_alua_check_nonop_delay(struct se_cmd *);
  98 extern int core_alua_do_port_transition(struct t10_alua_tg_pt_gp *,
  99                                 struct se_device *, struct se_lun *,
 100                                 struct se_node_acl *, int, int);
 101 extern char *core_alua_dump_status(int);
 102 extern struct t10_alua_lba_map *core_alua_allocate_lba_map(
 103                                 struct list_head *, u64, u64);
 104 extern int core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *, int, int);
 105 extern void core_alua_free_lba_map(struct list_head *);
 106 extern void core_alua_set_lba_map(struct se_device *, struct list_head *,
 107                                 int, int);
 108 extern struct t10_alua_lu_gp *core_alua_allocate_lu_gp(const char *, int);
 109 extern int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *, u16);
 110 extern void core_alua_free_lu_gp(struct t10_alua_lu_gp *);
 111 extern void core_alua_free_lu_gp_mem(struct se_device *);
 112 extern struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *);
 113 extern void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *);
 114 extern void __core_alua_attach_lu_gp_mem(struct t10_alua_lu_gp_member *,
 115                                         struct t10_alua_lu_gp *);
 116 extern void __core_alua_drop_lu_gp_mem(struct t10_alua_lu_gp_member *,
 117                                         struct t10_alua_lu_gp *);
 118 extern void core_alua_drop_lu_gp_dev(struct se_device *);
 119 extern struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(
 120                         struct se_device *, const char *, int);
 121 extern int core_alua_set_tg_pt_gp_id(struct t10_alua_tg_pt_gp *, u16);
 122 extern void core_alua_free_tg_pt_gp(struct t10_alua_tg_pt_gp *);
 123 extern void target_detach_tg_pt_gp(struct se_lun *);
 124 extern void target_attach_tg_pt_gp(struct se_lun *, struct t10_alua_tg_pt_gp *);
 125 extern ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *, char *);
 126 extern ssize_t core_alua_store_tg_pt_gp_info(struct se_lun *, const char *,
 127                                                 size_t);
 128 extern ssize_t core_alua_show_access_type(struct t10_alua_tg_pt_gp *, char *);
 129 extern ssize_t core_alua_store_access_type(struct t10_alua_tg_pt_gp *,
 130                                         const char *, size_t);
 131 extern ssize_t core_alua_show_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
 132                                                 char *);
 133 extern ssize_t core_alua_store_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
 134                                         const char *, size_t);
 135 extern ssize_t core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
 136                                         char *);
 137 extern ssize_t core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
 138                                         const char *, size_t);
 139 extern ssize_t core_alua_show_implicit_trans_secs(struct t10_alua_tg_pt_gp *,
 140                                         char *);
 141 extern ssize_t core_alua_store_implicit_trans_secs(struct t10_alua_tg_pt_gp *,
 142                                         const char *, size_t);
 143 extern ssize_t core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp *,
 144                                         char *);
 145 extern ssize_t core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp *,
 146                                         const char *, size_t);
 147 extern ssize_t core_alua_show_offline_bit(struct se_lun *, char *);
 148 extern ssize_t core_alua_store_offline_bit(struct se_lun *, const char *,
 149                                         size_t);
 150 extern ssize_t core_alua_show_secondary_status(struct se_lun *, char *);
 151 extern ssize_t core_alua_store_secondary_status(struct se_lun *,
 152                                         const char *, size_t);
 153 extern ssize_t core_alua_show_secondary_write_metadata(struct se_lun *,
 154                                         char *);
 155 extern ssize_t core_alua_store_secondary_write_metadata(struct se_lun *,
 156                                         const char *, size_t);
 157 extern int core_setup_alua(struct se_device *);
 158 extern sense_reason_t target_alua_state_check(struct se_cmd *cmd);
 159
 160 #endif /* TARGET_CORE_ALUA_H */