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linux/include/target/iscsi/iscsi_target_core.h

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef ISCSI_TARGET_CORE_H
#define ISCSI_TARGET_CORE_H
#include <linux/dma-direction.h> /* enum dma_data_direction */
#include <linux/list.h> /* struct list_head */
#include <linux/sched.h>
#include <linux/socket.h> /* struct sockaddr_storage */
#include <linux/types.h> /* u8 */
#include <scsi/iscsi_proto.h> /* itt_t */
#include <target/target_core_base.h> /* struct se_cmd */
struct sock;
#define ISCSIT_VERSION "v4.1.0"
#define ISCSI_MAX_DATASN_MISSING_COUNT 16
#define ISCSI_TX_THREAD_TCP_TIMEOUT 2
#define ISCSI_RX_THREAD_TCP_TIMEOUT 2
#define SECONDS_FOR_ASYNC_LOGOUT 10
#define SECONDS_FOR_ASYNC_TEXT 10
#define SECONDS_FOR_LOGOUT_COMP 15
#define WHITE_SPACE " \t\v\f\n\r"
#define ISCSIT_MIN_TAGS 16
#define ISCSIT_EXTRA_TAGS 8
#define ISCSIT_TCP_BACKLOG 256
#define ISCSI_RX_THREAD_NAME "iscsi_trx"
#define ISCSI_TX_THREAD_NAME "iscsi_ttx"
#define ISCSI_IQN_LEN 224
/* struct iscsi_node_attrib sanity values */
#define NA_DATAOUT_TIMEOUT 3
#define NA_DATAOUT_TIMEOUT_MAX 60
#define NA_DATAOUT_TIMEOUT_MIX 2
#define NA_DATAOUT_TIMEOUT_RETRIES 5
#define NA_DATAOUT_TIMEOUT_RETRIES_MAX 15
#define NA_DATAOUT_TIMEOUT_RETRIES_MIN 1
#define NA_NOPIN_TIMEOUT 15
#define NA_NOPIN_TIMEOUT_MAX 60
#define NA_NOPIN_TIMEOUT_MIN 3
#define NA_NOPIN_RESPONSE_TIMEOUT 30
#define NA_NOPIN_RESPONSE_TIMEOUT_MAX 60
#define NA_NOPIN_RESPONSE_TIMEOUT_MIN 3
#define NA_RANDOM_DATAIN_PDU_OFFSETS 0
#define NA_RANDOM_DATAIN_SEQ_OFFSETS 0
#define NA_RANDOM_R2T_OFFSETS 0
/* struct iscsi_tpg_attrib sanity values */
#define TA_AUTHENTICATION 1
#define TA_LOGIN_TIMEOUT 15
#define TA_LOGIN_TIMEOUT_MAX 30
#define TA_LOGIN_TIMEOUT_MIN 5
#define TA_NETIF_TIMEOUT 2
#define TA_NETIF_TIMEOUT_MAX 15
#define TA_NETIF_TIMEOUT_MIN 2
#define TA_GENERATE_NODE_ACLS 0
#define TA_DEFAULT_CMDSN_DEPTH 64
#define TA_DEFAULT_CMDSN_DEPTH_MAX 512
#define TA_DEFAULT_CMDSN_DEPTH_MIN 1
#define TA_CACHE_DYNAMIC_ACLS 0
/* Enabled by default in demo mode (generic_node_acls=1) */
#define TA_DEMO_MODE_WRITE_PROTECT 1
/* Disabled by default in production mode w/ explict ACLs */
#define TA_PROD_MODE_WRITE_PROTECT 0
#define TA_DEMO_MODE_DISCOVERY 1
#define TA_DEFAULT_ERL 0
#define TA_CACHE_CORE_NPS 0
/* T10 protection information disabled by default */
#define TA_DEFAULT_T10_PI 0
#define TA_DEFAULT_FABRIC_PROT_TYPE 0
/* TPG status needs to be enabled to return sendtargets discovery endpoint info */
#define TA_DEFAULT_TPG_ENABLED_SENDTARGETS 1
/*
* Used to control the sending of keys with optional to respond state bit,
* as a workaround for non RFC compliant initiators,that do not propose,
* nor respond to specific keys required for login to complete.
*
* See iscsi_check_proposer_for_optional_reply() for more details.
*/
#define TA_DEFAULT_LOGIN_KEYS_WORKAROUND 1
#define ISCSI_IOV_DATA_BUFFER 5
enum iscsit_transport_type {
ISCSI_TCP = 0,
ISCSI_SCTP_TCP = 1,
ISCSI_SCTP_UDP = 2,
ISCSI_IWARP_TCP = 3,
ISCSI_IWARP_SCTP = 4,
ISCSI_INFINIBAND = 5,
ISCSI_CXGBIT = 6,
};
/* RFC-3720 7.1.4 Standard Connection State Diagram for a Target */
enum target_conn_state_table {
TARG_CONN_STATE_FREE = 0x1,
TARG_CONN_STATE_XPT_UP = 0x3,
TARG_CONN_STATE_IN_LOGIN = 0x4,
TARG_CONN_STATE_LOGGED_IN = 0x5,
TARG_CONN_STATE_IN_LOGOUT = 0x6,
TARG_CONN_STATE_LOGOUT_REQUESTED = 0x7,
TARG_CONN_STATE_CLEANUP_WAIT = 0x8,
};
/* RFC-3720 7.3.2 Session State Diagram for a Target */
enum target_sess_state_table {
TARG_SESS_STATE_FREE = 0x1,
TARG_SESS_STATE_ACTIVE = 0x2,
TARG_SESS_STATE_LOGGED_IN = 0x3,
TARG_SESS_STATE_FAILED = 0x4,
TARG_SESS_STATE_IN_CONTINUE = 0x5,
};
/* struct iscsi_data_count->type */
enum data_count_type {
ISCSI_RX_DATA = 1,
ISCSI_TX_DATA = 2,
};
/* struct iscsi_datain_req->dr_complete */
enum datain_req_comp_table {
DATAIN_COMPLETE_NORMAL = 1,
DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY = 2,
DATAIN_COMPLETE_CONNECTION_RECOVERY = 3,
};
/* struct iscsi_datain_req->recovery */
enum datain_req_rec_table {
DATAIN_WITHIN_COMMAND_RECOVERY = 1,
DATAIN_CONNECTION_RECOVERY = 2,
};
/* struct iscsi_portal_group->state */
enum tpg_state_table {
TPG_STATE_FREE = 0,
TPG_STATE_ACTIVE = 1,
TPG_STATE_INACTIVE = 2,
TPG_STATE_COLD_RESET = 3,
};
/* struct iscsi_tiqn->tiqn_state */
enum tiqn_state_table {
TIQN_STATE_ACTIVE = 1,
TIQN_STATE_SHUTDOWN = 2,
};
/* struct iscsi_cmd->cmd_flags */
enum cmd_flags_table {
ICF_GOT_LAST_DATAOUT = 0x00000001,
ICF_GOT_DATACK_SNACK = 0x00000002,
ICF_NON_IMMEDIATE_UNSOLICITED_DATA = 0x00000004,
ICF_SENT_LAST_R2T = 0x00000008,
ICF_WITHIN_COMMAND_RECOVERY = 0x00000010,
ICF_CONTIG_MEMORY = 0x00000020,
ICF_ATTACHED_TO_RQUEUE = 0x00000040,
ICF_OOO_CMDSN = 0x00000080,
ICF_SENDTARGETS_ALL = 0x00000100,
ICF_SENDTARGETS_SINGLE = 0x00000200,
};
/* struct iscsi_cmd->i_state */
enum cmd_i_state_table {
ISTATE_NO_STATE = 0,
ISTATE_NEW_CMD = 1,
ISTATE_DEFERRED_CMD = 2,
ISTATE_UNSOLICITED_DATA = 3,
ISTATE_RECEIVE_DATAOUT = 4,
ISTATE_RECEIVE_DATAOUT_RECOVERY = 5,
ISTATE_RECEIVED_LAST_DATAOUT = 6,
ISTATE_WITHIN_DATAOUT_RECOVERY = 7,
ISTATE_IN_CONNECTION_RECOVERY = 8,
ISTATE_RECEIVED_TASKMGT = 9,
ISTATE_SEND_ASYNCMSG = 10,
ISTATE_SENT_ASYNCMSG = 11,
ISTATE_SEND_DATAIN = 12,
ISTATE_SEND_LAST_DATAIN = 13,
ISTATE_SENT_LAST_DATAIN = 14,
ISTATE_SEND_LOGOUTRSP = 15,
ISTATE_SENT_LOGOUTRSP = 16,
ISTATE_SEND_NOPIN = 17,
ISTATE_SENT_NOPIN = 18,
ISTATE_SEND_REJECT = 19,
ISTATE_SENT_REJECT = 20,
ISTATE_SEND_R2T = 21,
ISTATE_SENT_R2T = 22,
ISTATE_SEND_R2T_RECOVERY = 23,
ISTATE_SENT_R2T_RECOVERY = 24,
ISTATE_SEND_LAST_R2T = 25,
ISTATE_SENT_LAST_R2T = 26,
ISTATE_SEND_LAST_R2T_RECOVERY = 27,
ISTATE_SENT_LAST_R2T_RECOVERY = 28,
ISTATE_SEND_STATUS = 29,
ISTATE_SEND_STATUS_BROKEN_PC = 30,
ISTATE_SENT_STATUS = 31,
ISTATE_SEND_STATUS_RECOVERY = 32,
ISTATE_SENT_STATUS_RECOVERY = 33,
ISTATE_SEND_TASKMGTRSP = 34,
ISTATE_SENT_TASKMGTRSP = 35,
ISTATE_SEND_TEXTRSP = 36,
ISTATE_SENT_TEXTRSP = 37,
ISTATE_SEND_NOPIN_WANT_RESPONSE = 38,
ISTATE_SENT_NOPIN_WANT_RESPONSE = 39,
ISTATE_SEND_NOPIN_NO_RESPONSE = 40,
ISTATE_REMOVE = 41,
ISTATE_FREE = 42,
};
/* Used for iscsi_recover_cmdsn() return values */
enum recover_cmdsn_ret_table {
CMDSN_ERROR_CANNOT_RECOVER = -1,
CMDSN_NORMAL_OPERATION = 0,
CMDSN_LOWER_THAN_EXP = 1,
CMDSN_HIGHER_THAN_EXP = 2,
CMDSN_MAXCMDSN_OVERRUN = 3,
};
/* Used for iscsi_handle_immediate_data() return values */
enum immedate_data_ret_table {
IMMEDIATE_DATA_CANNOT_RECOVER = -1,
IMMEDIATE_DATA_NORMAL_OPERATION = 0,
IMMEDIATE_DATA_ERL1_CRC_FAILURE = 1,
};
/* Used for iscsi_decide_dataout_action() return values */
enum dataout_action_ret_table {
DATAOUT_CANNOT_RECOVER = -1,
DATAOUT_NORMAL = 0,
DATAOUT_SEND_R2T = 1,
DATAOUT_SEND_TO_TRANSPORT = 2,
DATAOUT_WITHIN_COMMAND_RECOVERY = 3,
};
/* Used for struct iscsi_node_auth->naf_flags */
enum naf_flags_table {
NAF_USERID_SET = 0x01,
NAF_PASSWORD_SET = 0x02,
NAF_USERID_IN_SET = 0x04,
NAF_PASSWORD_IN_SET = 0x08,
};
/* Used by various struct timer_list to manage iSCSI specific state */
enum iscsi_timer_flags_table {
ISCSI_TF_RUNNING = 0x01,
ISCSI_TF_STOP = 0x02,
ISCSI_TF_EXPIRED = 0x04,
};
/* Used for struct iscsi_np->np_flags */
enum np_flags_table {
NPF_IP_NETWORK = 0x00,
};
/* Used for struct iscsi_np->np_thread_state */
enum np_thread_state_table {
ISCSI_NP_THREAD_ACTIVE = 1,
ISCSI_NP_THREAD_INACTIVE = 2,
ISCSI_NP_THREAD_RESET = 3,
ISCSI_NP_THREAD_SHUTDOWN = 4,
ISCSI_NP_THREAD_EXIT = 5,
};
struct iscsi_conn_ops {
u8 HeaderDigest; /* [0,1] == [None,CRC32C] */
u8 DataDigest; /* [0,1] == [None,CRC32C] */
u32 MaxRecvDataSegmentLength; /* [512..2**24-1] */
u32 MaxXmitDataSegmentLength; /* [512..2**24-1] */
/*
* iSER specific connection parameters
*/
u32 InitiatorRecvDataSegmentLength; /* [512..2**24-1] */
u32 TargetRecvDataSegmentLength; /* [512..2**24-1] */
};
struct iscsi_sess_ops {
char InitiatorName[ISCSI_IQN_LEN];
char InitiatorAlias[256];
char TargetName[ISCSI_IQN_LEN];
char TargetAlias[256];
char TargetAddress[256];
u16 TargetPortalGroupTag; /* [0..65535] */
u16 MaxConnections; /* [1..65535] */
u8 InitialR2T; /* [0,1] == [No,Yes] */
u8 ImmediateData; /* [0,1] == [No,Yes] */
u32 MaxBurstLength; /* [512..2**24-1] */
u32 FirstBurstLength; /* [512..2**24-1] */
u16 DefaultTime2Wait; /* [0..3600] */
u16 DefaultTime2Retain; /* [0..3600] */
u16 MaxOutstandingR2T; /* [1..65535] */
u8 DataPDUInOrder; /* [0,1] == [No,Yes] */
u8 DataSequenceInOrder; /* [0,1] == [No,Yes] */
u8 ErrorRecoveryLevel; /* [0..2] */
u8 SessionType; /* [0,1] == [Normal,Discovery]*/
/*
* iSER specific session parameters
*/
u8 RDMAExtensions; /* [0,1] == [No,Yes] */
};
struct iscsi_queue_req {
int state;
struct iscsi_cmd *cmd;
struct list_head qr_list;
};
struct iscsi_data_count {
int data_length;
int sync_and_steering;
enum data_count_type type;
u32 iov_count;
u32 ss_iov_count;
u32 ss_marker_count;
struct kvec *iov;
};
struct iscsi_param_list {
bool iser;
struct list_head param_list;
struct list_head extra_response_list;
};
struct iscsi_datain_req {
enum datain_req_comp_table dr_complete;
int generate_recovery_values;
enum datain_req_rec_table recovery;
u32 begrun;
u32 runlength;
u32 data_length;
u32 data_offset;
u32 data_sn;
u32 next_burst_len;
u32 read_data_done;
u32 seq_send_order;
struct list_head cmd_datain_node;
} ____cacheline_aligned;
struct iscsi_ooo_cmdsn {
u16 cid;
u32 batch_count;
u32 cmdsn;
u32 exp_cmdsn;
struct iscsi_cmd *cmd;
struct list_head ooo_list;
} ____cacheline_aligned;
struct iscsi_datain {
u8 flags;
u32 data_sn;
u32 length;
u32 offset;
} ____cacheline_aligned;
struct iscsi_r2t {
int seq_complete;
int recovery_r2t;
int sent_r2t;
u32 r2t_sn;
u32 offset;
u32 targ_xfer_tag;
u32 xfer_len;
struct list_head r2t_list;
} ____cacheline_aligned;
struct iscsi_cmd {
enum iscsi_timer_flags_table dataout_timer_flags;
/* DataOUT timeout retries */
u8 dataout_timeout_retries;
/* Within command recovery count */
u8 error_recovery_count;
/* iSCSI dependent state for out or order CmdSNs */
enum cmd_i_state_table deferred_i_state;
/* iSCSI dependent state */
enum cmd_i_state_table i_state;
/* Command is an immediate command (ISCSI_OP_IMMEDIATE set) */
u8 immediate_cmd;
/* Immediate data present */
u8 immediate_data;
/* iSCSI Opcode */
u8 iscsi_opcode;
/* iSCSI Response Code */
u8 iscsi_response;
/* Logout reason when iscsi_opcode == ISCSI_INIT_LOGOUT_CMND */
u8 logout_reason;
/* Logout response code when iscsi_opcode == ISCSI_INIT_LOGOUT_CMND */
u8 logout_response;
/* MaxCmdSN has been incremented */
u8 maxcmdsn_inc;
/* Immediate Unsolicited Dataout */
u8 unsolicited_data;
/* Reject reason code */
u8 reject_reason;
/* CID contained in logout PDU when opcode == ISCSI_INIT_LOGOUT_CMND */
u16 logout_cid;
/* Command flags */
enum cmd_flags_table cmd_flags;
/* Initiator Task Tag assigned from Initiator */
itt_t init_task_tag;
/* Target Transfer Tag assigned from Target */
u32 targ_xfer_tag;
/* CmdSN assigned from Initiator */
u32 cmd_sn;
/* ExpStatSN assigned from Initiator */
u32 exp_stat_sn;
/* StatSN assigned to this ITT */
u32 stat_sn;
/* DataSN Counter */
u32 data_sn;
/* R2TSN Counter */
u32 r2t_sn;
/* Last DataSN acknowledged via DataAck SNACK */
u32 acked_data_sn;
/* Used for echoing NOPOUT ping data */
u32 buf_ptr_size;
/* Used to store DataDigest */
u32 data_crc;
/* Counter for MaxOutstandingR2T */
u32 outstanding_r2ts;
/* Next R2T Offset when DataSequenceInOrder=Yes */
u32 r2t_offset;
/* Iovec current and orig count for iscsi_cmd->iov_data */
u32 iov_data_count;
u32 orig_iov_data_count;
/* Number of miscellaneous iovecs used for IP stack calls */
u32 iov_misc_count;
/* Number of struct iscsi_pdu in struct iscsi_cmd->pdu_list */
u32 pdu_count;
/* Next struct iscsi_pdu to send in struct iscsi_cmd->pdu_list */
u32 pdu_send_order;
/* Current struct iscsi_pdu in struct iscsi_cmd->pdu_list */
u32 pdu_start;
/* Next struct iscsi_seq to send in struct iscsi_cmd->seq_list */
u32 seq_send_order;
/* Number of struct iscsi_seq in struct iscsi_cmd->seq_list */
u32 seq_count;
/* Current struct iscsi_seq in struct iscsi_cmd->seq_list */
u32 seq_no;
/* Lowest offset in current DataOUT sequence */
u32 seq_start_offset;
/* Highest offset in current DataOUT sequence */
u32 seq_end_offset;
/* Total size in bytes received so far of READ data */
u32 read_data_done;
/* Total size in bytes received so far of WRITE data */
u32 write_data_done;
/* Counter for FirstBurstLength key */
u32 first_burst_len;
/* Counter for MaxBurstLength key */
u32 next_burst_len;
/* Transfer size used for IP stack calls */
u32 tx_size;
/* Buffer used for various purposes */
void *buf_ptr;
/* Used by SendTargets=[iqn.,eui.] discovery */
void *text_in_ptr;
/* See include/linux/dma-mapping.h */
enum dma_data_direction data_direction;
/* iSCSI PDU Header + CRC */
unsigned char pdu[ISCSI_HDR_LEN + ISCSI_CRC_LEN];
/* Number of times struct iscsi_cmd is present in immediate queue */
atomic_t immed_queue_count;
atomic_t response_queue_count;
spinlock_t datain_lock;
spinlock_t dataout_timeout_lock;
/* spinlock for protecting struct iscsi_cmd->i_state */
spinlock_t istate_lock;
/* spinlock for adding within command recovery entries */
spinlock_t error_lock;
/* spinlock for adding R2Ts */
spinlock_t r2t_lock;
/* DataIN List */
struct list_head datain_list;
/* R2T List */
struct list_head cmd_r2t_list;
/* Timer for DataOUT */
struct timer_list dataout_timer;
/* Iovecs for SCSI data payload RX/TX w/ kernel level sockets */
struct kvec *iov_data;
void *overflow_buf;
/* Iovecs for miscellaneous purposes */
#define ISCSI_MISC_IOVECS 5
struct kvec iov_misc[ISCSI_MISC_IOVECS];
/* Array of struct iscsi_pdu used for DataPDUInOrder=No */
struct iscsi_pdu *pdu_list;
/* Current struct iscsi_pdu used for DataPDUInOrder=No */
struct iscsi_pdu *pdu_ptr;
/* Array of struct iscsi_seq used for DataSequenceInOrder=No */
struct iscsi_seq *seq_list;
/* Current struct iscsi_seq used for DataSequenceInOrder=No */
struct iscsi_seq *seq_ptr;
/* TMR Request when iscsi_opcode == ISCSI_OP_SCSI_TMFUNC */
struct iscsi_tmr_req *tmr_req;
/* Connection this command is alligient to */
struct iscsi_conn *conn;
/* Pointer to connection recovery entry */
struct iscsi_conn_recovery *cr;
/* Session the command is part of, used for connection recovery */
struct iscsi_session *sess;
/* list_head for connection list */
struct list_head i_conn_node;
/* The TCM I/O descriptor that is accessed via container_of() */
struct se_cmd se_cmd;
/* Sense buffer that will be mapped into outgoing status */
#define ISCSI_SENSE_BUFFER_LEN (TRANSPORT_SENSE_BUFFER + 2)
unsigned char sense_buffer[ISCSI_SENSE_BUFFER_LEN];
u32 padding;
u8 pad_bytes[4];
struct scatterlist *first_data_sg;
u32 first_data_sg_off;
u32 kmapped_nents;
sense_reason_t sense_reason;
} ____cacheline_aligned;
struct iscsi_tmr_req {
bool task_reassign:1;
u32 exp_data_sn;
struct iscsi_cmd *ref_cmd;
struct iscsi_conn_recovery *conn_recovery;
struct se_tmr_req *se_tmr_req;
};
struct iscsi_conn {
wait_queue_head_t queues_wq;
/* Authentication Successful for this connection */
u8 auth_complete;
/* State connection is currently in */
u8 conn_state;
u8 conn_logout_reason;
u8 network_transport;
enum iscsi_timer_flags_table nopin_timer_flags;
enum iscsi_timer_flags_table nopin_response_timer_flags;
/* Used to know what thread encountered a transport failure */
u8 which_thread;
/* connection id assigned by the Initiator */
u16 cid;
/* Remote TCP Port */
u16 login_port;
int net_size;
int login_family;
u32 auth_id;
u32 conn_flags;
/* Used for iscsi_tx_login_rsp() */
itt_t login_itt;
u32 exp_statsn;
/* Per connection status sequence number */
u32 stat_sn;
struct sockaddr_storage login_sockaddr;
struct sockaddr_storage local_sockaddr;
int conn_usage_count;
int conn_waiting_on_uc;
atomic_t check_immediate_queue;
atomic_t conn_logout_remove;
atomic_t connection_exit;
atomic_t connection_recovery;
atomic_t connection_reinstatement;
atomic_t connection_wait_rcfr;
atomic_t sleep_on_conn_wait_comp;
atomic_t transport_failed;
struct completion conn_post_wait_comp;
struct completion conn_wait_comp;
struct completion conn_wait_rcfr_comp;
struct completion conn_waiting_on_uc_comp;
struct completion conn_logout_comp;
struct completion tx_half_close_comp;
struct completion rx_half_close_comp;
/* socket used by this connection */
struct socket *sock;
void (*orig_data_ready)(struct sock *);
void (*orig_state_change)(struct sock *);
#define LOGIN_FLAGS_READ_ACTIVE 1
#define LOGIN_FLAGS_CLOSED 2
#define LOGIN_FLAGS_READY 4
#define LOGIN_FLAGS_INITIAL_PDU 8
unsigned long login_flags;
struct delayed_work login_work;
struct iscsi_login *login;
struct timer_list nopin_timer;
struct timer_list nopin_response_timer;
struct timer_list transport_timer;
struct task_struct *login_kworker;
/* Spinlock used for add/deleting cmd's from conn_cmd_list */
spinlock_t cmd_lock;
spinlock_t conn_usage_lock;
spinlock_t immed_queue_lock;
spinlock_t nopin_timer_lock;
spinlock_t response_queue_lock;
spinlock_t state_lock;
/* libcrypto RX and TX contexts for crc32c */
struct ahash_request *conn_rx_hash;
struct ahash_request *conn_tx_hash;
/* Used for scheduling TX and RX connection kthreads */
cpumask_var_t conn_cpumask;
unsigned int conn_rx_reset_cpumask:1;
unsigned int conn_tx_reset_cpumask:1;
/* list_head of struct iscsi_cmd for this connection */
struct list_head conn_cmd_list;
struct list_head immed_queue_list;
struct list_head response_queue_list;
struct iscsi_conn_ops *conn_ops;
struct iscsi_login *conn_login;
struct iscsit_transport *conn_transport;
struct iscsi_param_list *param_list;
/* Used for per connection auth state machine */
void *auth_protocol;
void *context;
struct iscsi_login_thread_s *login_thread;
struct iscsi_portal_group *tpg;
struct iscsi_tpg_np *tpg_np;
/* Pointer to parent session */
struct iscsi_session *sess;
int bitmap_id;
int rx_thread_active;
struct task_struct *rx_thread;
struct completion rx_login_comp;
int tx_thread_active;
struct task_struct *tx_thread;
/* list_head for session connection list */
struct list_head conn_list;
} ____cacheline_aligned;
struct iscsi_conn_recovery {
u16 cid;
u32 cmd_count;
u32 maxrecvdatasegmentlength;
u32 maxxmitdatasegmentlength;
int ready_for_reallegiance;
struct list_head conn_recovery_cmd_list;
spinlock_t conn_recovery_cmd_lock;
struct timer_list time2retain_timer;
struct iscsi_session *sess;
struct list_head cr_list;
} ____cacheline_aligned;
struct iscsi_session {
u8 initiator_vendor;
u8 isid[6];
enum iscsi_timer_flags_table time2retain_timer_flags;
u8 version_active;
u16 cid_called;
u16 conn_recovery_count;
u16 tsih;
/* state session is currently in */
u32 session_state;
/* session wide counter: initiator assigned task tag */
itt_t init_task_tag;
/* session wide counter: target assigned task tag */
u32 targ_xfer_tag;
u32 cmdsn_window;
/* protects cmdsn values */
struct mutex cmdsn_mutex;
/* session wide counter: expected command sequence number */
u32 exp_cmd_sn;
/* session wide counter: maximum allowed command sequence number */
atomic_t max_cmd_sn;
struct list_head sess_ooo_cmdsn_list;
/* LIO specific session ID */
u32 sid;
char auth_type[8];
/* unique within the target */
int session_index;
/* Used for session reference counting */
int session_usage_count;
int session_waiting_on_uc;
atomic_long_t cmd_pdus;
atomic_long_t rsp_pdus;
atomic_long_t tx_data_octets;
atomic_long_t rx_data_octets;
atomic_long_t conn_digest_errors;
atomic_long_t conn_timeout_errors;
u64 creation_time;
/* Number of active connections */
atomic_t nconn;
atomic_t session_continuation;
atomic_t session_fall_back_to_erl0;
atomic_t session_logout;
atomic_t session_reinstatement;
atomic_t session_stop_active;
atomic_t sleep_on_sess_wait_comp;
/* connection list */
struct list_head sess_conn_list;
struct list_head cr_active_list;
struct list_head cr_inactive_list;
spinlock_t conn_lock;
spinlock_t cr_a_lock;
spinlock_t cr_i_lock;
spinlock_t session_usage_lock;
spinlock_t ttt_lock;
struct completion async_msg_comp;
struct completion reinstatement_comp;
struct completion session_wait_comp;
struct completion session_waiting_on_uc_comp;
struct timer_list time2retain_timer;
struct iscsi_sess_ops *sess_ops;
struct se_session *se_sess;
struct iscsi_portal_group *tpg;
} ____cacheline_aligned;
struct iscsi_login {
u8 auth_complete;
u8 checked_for_existing;
u8 current_stage;
u8 leading_connection;
u8 first_request;
u8 version_min;
u8 version_max;
u8 login_complete;
u8 login_failed;
bool zero_tsih;
char isid[6];
u32 cmd_sn;
itt_t init_task_tag;
u32 initial_exp_statsn;
u32 rsp_length;
u16 cid;
u16 tsih;
char req[ISCSI_HDR_LEN];
char rsp[ISCSI_HDR_LEN];
char *req_buf;
char *rsp_buf;
struct iscsi_conn *conn;
struct iscsi_np *np;
} ____cacheline_aligned;
struct iscsi_node_attrib {
u32 dataout_timeout;
u32 dataout_timeout_retries;
u32 default_erl;
u32 nopin_timeout;
u32 nopin_response_timeout;
u32 random_datain_pdu_offsets;
u32 random_datain_seq_offsets;
u32 random_r2t_offsets;
u32 tmr_cold_reset;
u32 tmr_warm_reset;
struct iscsi_node_acl *nacl;
};
struct se_dev_entry_s;
struct iscsi_node_auth {
enum naf_flags_table naf_flags;
int authenticate_target;
/* Used for iscsit_global->discovery_auth,
* set to zero (auth disabled) by default */
int enforce_discovery_auth;
#define MAX_USER_LEN 256
#define MAX_PASS_LEN 256
char userid[MAX_USER_LEN];
char password[MAX_PASS_LEN];
char userid_mutual[MAX_USER_LEN];
char password_mutual[MAX_PASS_LEN];
};
#include "iscsi_target_stat.h"
struct iscsi_node_stat_grps {
struct config_group iscsi_sess_stats_group;
struct config_group iscsi_conn_stats_group;
};
struct iscsi_node_acl {
struct se_node_acl se_node_acl;
struct iscsi_node_attrib node_attrib;
struct iscsi_node_auth node_auth;
struct iscsi_node_stat_grps node_stat_grps;
};
struct iscsi_tpg_attrib {
u32 authentication;
u32 login_timeout;
u32 netif_timeout;
u32 generate_node_acls;
u32 cache_dynamic_acls;
u32 default_cmdsn_depth;
u32 demo_mode_write_protect;
u32 prod_mode_write_protect;
u32 demo_mode_discovery;
u32 default_erl;
u8 t10_pi;
u32 fabric_prot_type;
u32 tpg_enabled_sendtargets;
u32 login_keys_workaround;
struct iscsi_portal_group *tpg;
};
struct iscsi_np {
int np_network_transport;
int np_ip_proto;
int np_sock_type;
enum np_thread_state_table np_thread_state;
bool enabled;
atomic_t np_reset_count;
enum iscsi_timer_flags_table np_login_timer_flags;
u32 np_exports;
enum np_flags_table np_flags;
spinlock_t np_thread_lock;
struct completion np_restart_comp;
struct socket *np_socket;
struct sockaddr_storage np_sockaddr;
struct task_struct *np_thread;
struct timer_list np_login_timer;
void *np_context;
struct iscsit_transport *np_transport;
struct list_head np_list;
} ____cacheline_aligned;
struct iscsi_tpg_np {
struct iscsi_np *tpg_np;
struct iscsi_portal_group *tpg;
struct iscsi_tpg_np *tpg_np_parent;
struct list_head tpg_np_list;
struct list_head tpg_np_child_list;
struct list_head tpg_np_parent_list;
struct se_tpg_np se_tpg_np;
spinlock_t tpg_np_parent_lock;
struct completion tpg_np_comp;
struct kref tpg_np_kref;
};
struct iscsi_portal_group {
unsigned char tpg_chap_id;
/* TPG State */
enum tpg_state_table tpg_state;
/* Target Portal Group Tag */
u16 tpgt;
/* Id assigned to target sessions */
u16 ntsih;
/* Number of active sessions */
u32 nsessions;
/* Number of Network Portals available for this TPG */
u32 num_tpg_nps;
/* Per TPG LIO specific session ID. */
u32 sid;
/* Spinlock for adding/removing Network Portals */
spinlock_t tpg_np_lock;
spinlock_t tpg_state_lock;
struct se_portal_group tpg_se_tpg;
struct mutex tpg_access_lock;
struct semaphore np_login_sem;
struct iscsi_tpg_attrib tpg_attrib;
struct iscsi_node_auth tpg_demo_auth;
/* Pointer to default list of iSCSI parameters for TPG */
struct iscsi_param_list *param_list;
struct iscsi_tiqn *tpg_tiqn;
struct list_head tpg_gnp_list;
struct list_head tpg_list;
} ____cacheline_aligned;
struct iscsi_wwn_stat_grps {
struct config_group iscsi_stat_group;
struct config_group iscsi_instance_group;
struct config_group iscsi_sess_err_group;
struct config_group iscsi_tgt_attr_group;
struct config_group iscsi_login_stats_group;
struct config_group iscsi_logout_stats_group;
};
struct iscsi_tiqn {
unsigned char tiqn[ISCSI_IQN_LEN];
enum tiqn_state_table tiqn_state;
int tiqn_access_count;
u32 tiqn_active_tpgs;
u32 tiqn_ntpgs;
u32 tiqn_num_tpg_nps;
u32 tiqn_nsessions;
struct list_head tiqn_list;
struct list_head tiqn_tpg_list;
spinlock_t tiqn_state_lock;
spinlock_t tiqn_tpg_lock;
struct se_wwn tiqn_wwn;
struct iscsi_wwn_stat_grps tiqn_stat_grps;
int tiqn_index;
struct iscsi_sess_err_stats sess_err_stats;
struct iscsi_login_stats login_stats;
struct iscsi_logout_stats logout_stats;
} ____cacheline_aligned;
struct iscsit_global {
/* In core shutdown */
u32 in_shutdown;
u32 active_ts;
/* Unique identifier used for the authentication daemon */
u32 auth_id;
u32 inactive_ts;
#define ISCSIT_BITMAP_BITS 262144
/* Thread Set bitmap pointer */
unsigned long *ts_bitmap;
spinlock_t ts_bitmap_lock;
/* Used for iSCSI discovery session authentication */
struct iscsi_node_acl discovery_acl;
struct iscsi_portal_group *discovery_tpg;
};
static inline u32 session_get_next_ttt(struct iscsi_session *session)
{
u32 ttt;
spin_lock_bh(&session->ttt_lock);
ttt = session->targ_xfer_tag++;
if (ttt == 0xFFFFFFFF)
ttt = session->targ_xfer_tag++;
spin_unlock_bh(&session->ttt_lock);
return ttt;
}
extern struct iscsi_cmd *iscsit_find_cmd_from_itt(struct iscsi_conn *, itt_t);
static inline void iscsit_thread_check_cpumask(
struct iscsi_conn *conn,
struct task_struct *p,
int mode)
{
/*
* mode == 1 signals iscsi_target_tx_thread() usage.
* mode == 0 signals iscsi_target_rx_thread() usage.
*/
if (mode == 1) {
if (!conn->conn_tx_reset_cpumask)
return;
conn->conn_tx_reset_cpumask = 0;
} else {
if (!conn->conn_rx_reset_cpumask)
return;
conn->conn_rx_reset_cpumask = 0;
}
/*
* Update the CPU mask for this single kthread so that
* both TX and RX kthreads are scheduled to run on the
* same CPU.
*/
set_cpus_allowed_ptr(p, conn->conn_cpumask);
}
#endif /* ISCSI_TARGET_CORE_H */
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