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writeback: safer lock nesting
[linux/fpc-iii.git] / include / target / iscsi / iscsi_target_core.h
blobcf5f3fff1f1a7cb9930753c8abd88347ee66d048
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef ISCSI_TARGET_CORE_H
3 #define ISCSI_TARGET_CORE_H
4
5 #include <linux/dma-direction.h> /* enum dma_data_direction */
6 #include <linux/list.h> /* struct list_head */
7 #include <linux/socket.h> /* struct sockaddr_storage */
8 #include <linux/types.h> /* u8 */
9 #include <scsi/iscsi_proto.h> /* itt_t */
10 #include <target/target_core_base.h> /* struct se_cmd */
11
12 struct sock;
13
14 #define ISCSIT_VERSION "v4.1.0"
15 #define ISCSI_MAX_DATASN_MISSING_COUNT 16
16 #define ISCSI_TX_THREAD_TCP_TIMEOUT 2
17 #define ISCSI_RX_THREAD_TCP_TIMEOUT 2
18 #define SECONDS_FOR_ASYNC_LOGOUT 10
19 #define SECONDS_FOR_ASYNC_TEXT 10
20 #define SECONDS_FOR_LOGOUT_COMP 15
21 #define WHITE_SPACE " \t\v\f\n\r"
22 #define ISCSIT_MIN_TAGS 16
23 #define ISCSIT_EXTRA_TAGS 8
24 #define ISCSIT_TCP_BACKLOG 256
25 #define ISCSI_RX_THREAD_NAME "iscsi_trx"
26 #define ISCSI_TX_THREAD_NAME "iscsi_ttx"
27
28 /* struct iscsi_node_attrib sanity values */
29 #define NA_DATAOUT_TIMEOUT 3
30 #define NA_DATAOUT_TIMEOUT_MAX 60
31 #define NA_DATAOUT_TIMEOUT_MIX 2
32 #define NA_DATAOUT_TIMEOUT_RETRIES 5
33 #define NA_DATAOUT_TIMEOUT_RETRIES_MAX 15
34 #define NA_DATAOUT_TIMEOUT_RETRIES_MIN 1
35 #define NA_NOPIN_TIMEOUT 15
36 #define NA_NOPIN_TIMEOUT_MAX 60
37 #define NA_NOPIN_TIMEOUT_MIN 3
38 #define NA_NOPIN_RESPONSE_TIMEOUT 30
39 #define NA_NOPIN_RESPONSE_TIMEOUT_MAX 60
40 #define NA_NOPIN_RESPONSE_TIMEOUT_MIN 3
41 #define NA_RANDOM_DATAIN_PDU_OFFSETS 0
42 #define NA_RANDOM_DATAIN_SEQ_OFFSETS 0
43 #define NA_RANDOM_R2T_OFFSETS 0
44
45 /* struct iscsi_tpg_attrib sanity values */
46 #define TA_AUTHENTICATION 1
47 #define TA_LOGIN_TIMEOUT 15
48 #define TA_LOGIN_TIMEOUT_MAX 30
49 #define TA_LOGIN_TIMEOUT_MIN 5
50 #define TA_NETIF_TIMEOUT 2
51 #define TA_NETIF_TIMEOUT_MAX 15
52 #define TA_NETIF_TIMEOUT_MIN 2
53 #define TA_GENERATE_NODE_ACLS 0
54 #define TA_DEFAULT_CMDSN_DEPTH 64
55 #define TA_DEFAULT_CMDSN_DEPTH_MAX 512
56 #define TA_DEFAULT_CMDSN_DEPTH_MIN 1
57 #define TA_CACHE_DYNAMIC_ACLS 0
58 /* Enabled by default in demo mode (generic_node_acls=1) */
59 #define TA_DEMO_MODE_WRITE_PROTECT 1
60 /* Disabled by default in production mode w/ explict ACLs */
61 #define TA_PROD_MODE_WRITE_PROTECT 0
62 #define TA_DEMO_MODE_DISCOVERY 1
63 #define TA_DEFAULT_ERL 0
64 #define TA_CACHE_CORE_NPS 0
65 /* T10 protection information disabled by default */
66 #define TA_DEFAULT_T10_PI 0
67 #define TA_DEFAULT_FABRIC_PROT_TYPE 0
68 /* TPG status needs to be enabled to return sendtargets discovery endpoint info */
69 #define TA_DEFAULT_TPG_ENABLED_SENDTARGETS 1
70 /*
71 * Used to control the sending of keys with optional to respond state bit,
72 * as a workaround for non RFC compliant initiators,that do not propose,
73 * nor respond to specific keys required for login to complete.
74 *
75 * See iscsi_check_proposer_for_optional_reply() for more details.
76 */
77 #define TA_DEFAULT_LOGIN_KEYS_WORKAROUND 1
78
79 #define ISCSI_IOV_DATA_BUFFER 5
80
81 enum iscsit_transport_type {
82 ISCSI_TCP = 0,
83 ISCSI_SCTP_TCP = 1,
84 ISCSI_SCTP_UDP = 2,
85 ISCSI_IWARP_TCP = 3,
86 ISCSI_IWARP_SCTP = 4,
87 ISCSI_INFINIBAND = 5,
88 ISCSI_CXGBIT = 6,
89 };
90
91 /* RFC-3720 7.1.4 Standard Connection State Diagram for a Target */
92 enum target_conn_state_table {
93 TARG_CONN_STATE_FREE = 0x1,
94 TARG_CONN_STATE_XPT_UP = 0x3,
95 TARG_CONN_STATE_IN_LOGIN = 0x4,
96 TARG_CONN_STATE_LOGGED_IN = 0x5,
97 TARG_CONN_STATE_IN_LOGOUT = 0x6,
98 TARG_CONN_STATE_LOGOUT_REQUESTED = 0x7,
99 TARG_CONN_STATE_CLEANUP_WAIT = 0x8,
100 };
101
102 /* RFC-3720 7.3.2 Session State Diagram for a Target */
103 enum target_sess_state_table {
104 TARG_SESS_STATE_FREE = 0x1,
105 TARG_SESS_STATE_ACTIVE = 0x2,
106 TARG_SESS_STATE_LOGGED_IN = 0x3,
107 TARG_SESS_STATE_FAILED = 0x4,
108 TARG_SESS_STATE_IN_CONTINUE = 0x5,
109 };
110
111 /* struct iscsi_data_count->type */
112 enum data_count_type {
113 ISCSI_RX_DATA = 1,
114 ISCSI_TX_DATA = 2,
115 };
116
117 /* struct iscsi_datain_req->dr_complete */
118 enum datain_req_comp_table {
119 DATAIN_COMPLETE_NORMAL = 1,
120 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY = 2,
121 DATAIN_COMPLETE_CONNECTION_RECOVERY = 3,
122 };
123
124 /* struct iscsi_datain_req->recovery */
125 enum datain_req_rec_table {
126 DATAIN_WITHIN_COMMAND_RECOVERY = 1,
127 DATAIN_CONNECTION_RECOVERY = 2,
128 };
129
130 /* struct iscsi_portal_group->state */
131 enum tpg_state_table {
132 TPG_STATE_FREE = 0,
133 TPG_STATE_ACTIVE = 1,
134 TPG_STATE_INACTIVE = 2,
135 TPG_STATE_COLD_RESET = 3,
136 };
137
138 /* struct iscsi_tiqn->tiqn_state */
139 enum tiqn_state_table {
140 TIQN_STATE_ACTIVE = 1,
141 TIQN_STATE_SHUTDOWN = 2,
142 };
143
144 /* struct iscsi_cmd->cmd_flags */
145 enum cmd_flags_table {
146 ICF_GOT_LAST_DATAOUT = 0x00000001,
147 ICF_GOT_DATACK_SNACK = 0x00000002,
148 ICF_NON_IMMEDIATE_UNSOLICITED_DATA = 0x00000004,
149 ICF_SENT_LAST_R2T = 0x00000008,
150 ICF_WITHIN_COMMAND_RECOVERY = 0x00000010,
151 ICF_CONTIG_MEMORY = 0x00000020,
152 ICF_ATTACHED_TO_RQUEUE = 0x00000040,
153 ICF_OOO_CMDSN = 0x00000080,
154 ICF_SENDTARGETS_ALL = 0x00000100,
155 ICF_SENDTARGETS_SINGLE = 0x00000200,
156 };
157
158 /* struct iscsi_cmd->i_state */
159 enum cmd_i_state_table {
160 ISTATE_NO_STATE = 0,
161 ISTATE_NEW_CMD = 1,
162 ISTATE_DEFERRED_CMD = 2,
163 ISTATE_UNSOLICITED_DATA = 3,
164 ISTATE_RECEIVE_DATAOUT = 4,
165 ISTATE_RECEIVE_DATAOUT_RECOVERY = 5,
166 ISTATE_RECEIVED_LAST_DATAOUT = 6,
167 ISTATE_WITHIN_DATAOUT_RECOVERY = 7,
168 ISTATE_IN_CONNECTION_RECOVERY = 8,
169 ISTATE_RECEIVED_TASKMGT = 9,
170 ISTATE_SEND_ASYNCMSG = 10,
171 ISTATE_SENT_ASYNCMSG = 11,
172 ISTATE_SEND_DATAIN = 12,
173 ISTATE_SEND_LAST_DATAIN = 13,
174 ISTATE_SENT_LAST_DATAIN = 14,
175 ISTATE_SEND_LOGOUTRSP = 15,
176 ISTATE_SENT_LOGOUTRSP = 16,
177 ISTATE_SEND_NOPIN = 17,
178 ISTATE_SENT_NOPIN = 18,
179 ISTATE_SEND_REJECT = 19,
180 ISTATE_SENT_REJECT = 20,
181 ISTATE_SEND_R2T = 21,
182 ISTATE_SENT_R2T = 22,
183 ISTATE_SEND_R2T_RECOVERY = 23,
184 ISTATE_SENT_R2T_RECOVERY = 24,
185 ISTATE_SEND_LAST_R2T = 25,
186 ISTATE_SENT_LAST_R2T = 26,
187 ISTATE_SEND_LAST_R2T_RECOVERY = 27,
188 ISTATE_SENT_LAST_R2T_RECOVERY = 28,
189 ISTATE_SEND_STATUS = 29,
190 ISTATE_SEND_STATUS_BROKEN_PC = 30,
191 ISTATE_SENT_STATUS = 31,
192 ISTATE_SEND_STATUS_RECOVERY = 32,
193 ISTATE_SENT_STATUS_RECOVERY = 33,
194 ISTATE_SEND_TASKMGTRSP = 34,
195 ISTATE_SENT_TASKMGTRSP = 35,
196 ISTATE_SEND_TEXTRSP = 36,
197 ISTATE_SENT_TEXTRSP = 37,
198 ISTATE_SEND_NOPIN_WANT_RESPONSE = 38,
199 ISTATE_SENT_NOPIN_WANT_RESPONSE = 39,
200 ISTATE_SEND_NOPIN_NO_RESPONSE = 40,
201 ISTATE_REMOVE = 41,
202 ISTATE_FREE = 42,
203 };
204
205 /* Used for iscsi_recover_cmdsn() return values */
206 enum recover_cmdsn_ret_table {
207 CMDSN_ERROR_CANNOT_RECOVER = -1,
208 CMDSN_NORMAL_OPERATION = 0,
209 CMDSN_LOWER_THAN_EXP = 1,
210 CMDSN_HIGHER_THAN_EXP = 2,
211 CMDSN_MAXCMDSN_OVERRUN = 3,
212 };
213
214 /* Used for iscsi_handle_immediate_data() return values */
215 enum immedate_data_ret_table {
216 IMMEDIATE_DATA_CANNOT_RECOVER = -1,
217 IMMEDIATE_DATA_NORMAL_OPERATION = 0,
218 IMMEDIATE_DATA_ERL1_CRC_FAILURE = 1,
219 };
220
221 /* Used for iscsi_decide_dataout_action() return values */
222 enum dataout_action_ret_table {
223 DATAOUT_CANNOT_RECOVER = -1,
224 DATAOUT_NORMAL = 0,
225 DATAOUT_SEND_R2T = 1,
226 DATAOUT_SEND_TO_TRANSPORT = 2,
227 DATAOUT_WITHIN_COMMAND_RECOVERY = 3,
228 };
229
230 /* Used for struct iscsi_node_auth->naf_flags */
231 enum naf_flags_table {
232 NAF_USERID_SET = 0x01,
233 NAF_PASSWORD_SET = 0x02,
234 NAF_USERID_IN_SET = 0x04,
235 NAF_PASSWORD_IN_SET = 0x08,
236 };
237
238 /* Used by various struct timer_list to manage iSCSI specific state */
239 enum iscsi_timer_flags_table {
240 ISCSI_TF_RUNNING = 0x01,
241 ISCSI_TF_STOP = 0x02,
242 ISCSI_TF_EXPIRED = 0x04,
243 };
244
245 /* Used for struct iscsi_np->np_flags */
246 enum np_flags_table {
247 NPF_IP_NETWORK = 0x00,
248 };
249
250 /* Used for struct iscsi_np->np_thread_state */
251 enum np_thread_state_table {
252 ISCSI_NP_THREAD_ACTIVE = 1,
253 ISCSI_NP_THREAD_INACTIVE = 2,
254 ISCSI_NP_THREAD_RESET = 3,
255 ISCSI_NP_THREAD_SHUTDOWN = 4,
256 ISCSI_NP_THREAD_EXIT = 5,
257 };
258
259 struct iscsi_conn_ops {
260 u8 HeaderDigest; /* [0,1] == [None,CRC32C] */
261 u8 DataDigest; /* [0,1] == [None,CRC32C] */
262 u32 MaxRecvDataSegmentLength; /* [512..2**24-1] */
263 u32 MaxXmitDataSegmentLength; /* [512..2**24-1] */
264 /*
265 * iSER specific connection parameters
266 */
267 u32 InitiatorRecvDataSegmentLength; /* [512..2**24-1] */
268 u32 TargetRecvDataSegmentLength; /* [512..2**24-1] */
269 };
270
271 struct iscsi_sess_ops {
272 char InitiatorName[224];
273 char InitiatorAlias[256];
274 char TargetName[224];
275 char TargetAlias[256];
276 char TargetAddress[256];
277 u16 TargetPortalGroupTag; /* [0..65535] */
278 u16 MaxConnections; /* [1..65535] */
279 u8 InitialR2T; /* [0,1] == [No,Yes] */
280 u8 ImmediateData; /* [0,1] == [No,Yes] */
281 u32 MaxBurstLength; /* [512..2**24-1] */
282 u32 FirstBurstLength; /* [512..2**24-1] */
283 u16 DefaultTime2Wait; /* [0..3600] */
284 u16 DefaultTime2Retain; /* [0..3600] */
285 u16 MaxOutstandingR2T; /* [1..65535] */
286 u8 DataPDUInOrder; /* [0,1] == [No,Yes] */
287 u8 DataSequenceInOrder; /* [0,1] == [No,Yes] */
288 u8 ErrorRecoveryLevel; /* [0..2] */
289 u8 SessionType; /* [0,1] == [Normal,Discovery]*/
290 /*
291 * iSER specific session parameters
292 */
293 u8 RDMAExtensions; /* [0,1] == [No,Yes] */
294 };
295
296 struct iscsi_queue_req {
297 int state;
298 struct iscsi_cmd *cmd;
299 struct list_head qr_list;
300 };
301
302 struct iscsi_data_count {
303 int data_length;
304 int sync_and_steering;
305 enum data_count_type type;
306 u32 iov_count;
307 u32 ss_iov_count;
308 u32 ss_marker_count;
309 struct kvec *iov;
310 };
311
312 struct iscsi_param_list {
313 bool iser;
314 struct list_head param_list;
315 struct list_head extra_response_list;
316 };
317
318 struct iscsi_datain_req {
319 enum datain_req_comp_table dr_complete;
320 int generate_recovery_values;
321 enum datain_req_rec_table recovery;
322 u32 begrun;
323 u32 runlength;
324 u32 data_length;
325 u32 data_offset;
326 u32 data_sn;
327 u32 next_burst_len;
328 u32 read_data_done;
329 u32 seq_send_order;
330 struct list_head cmd_datain_node;
331 } ____cacheline_aligned;
332
333 struct iscsi_ooo_cmdsn {
334 u16 cid;
335 u32 batch_count;
336 u32 cmdsn;
337 u32 exp_cmdsn;
338 struct iscsi_cmd *cmd;
339 struct list_head ooo_list;
340 } ____cacheline_aligned;
341
342 struct iscsi_datain {
343 u8 flags;
344 u32 data_sn;
345 u32 length;
346 u32 offset;
347 } ____cacheline_aligned;
348
349 struct iscsi_r2t {
350 int seq_complete;
351 int recovery_r2t;
352 int sent_r2t;
353 u32 r2t_sn;
354 u32 offset;
355 u32 targ_xfer_tag;
356 u32 xfer_len;
357 struct list_head r2t_list;
358 } ____cacheline_aligned;
359
360 struct iscsi_cmd {
361 enum iscsi_timer_flags_table dataout_timer_flags;
362 /* DataOUT timeout retries */
363 u8 dataout_timeout_retries;
364 /* Within command recovery count */
365 u8 error_recovery_count;
366 /* iSCSI dependent state for out or order CmdSNs */
367 enum cmd_i_state_table deferred_i_state;
368 /* iSCSI dependent state */
369 enum cmd_i_state_table i_state;
370 /* Command is an immediate command (ISCSI_OP_IMMEDIATE set) */
371 u8 immediate_cmd;
372 /* Immediate data present */
373 u8 immediate_data;
374 /* iSCSI Opcode */
375 u8 iscsi_opcode;
376 /* iSCSI Response Code */
377 u8 iscsi_response;
378 /* Logout reason when iscsi_opcode == ISCSI_INIT_LOGOUT_CMND */
379 u8 logout_reason;
380 /* Logout response code when iscsi_opcode == ISCSI_INIT_LOGOUT_CMND */
381 u8 logout_response;
382 /* MaxCmdSN has been incremented */
383 u8 maxcmdsn_inc;
384 /* Immediate Unsolicited Dataout */
385 u8 unsolicited_data;
386 /* Reject reason code */
387 u8 reject_reason;
388 /* CID contained in logout PDU when opcode == ISCSI_INIT_LOGOUT_CMND */
389 u16 logout_cid;
390 /* Command flags */
391 enum cmd_flags_table cmd_flags;
392 /* Initiator Task Tag assigned from Initiator */
393 itt_t init_task_tag;
394 /* Target Transfer Tag assigned from Target */
395 u32 targ_xfer_tag;
396 /* CmdSN assigned from Initiator */
397 u32 cmd_sn;
398 /* ExpStatSN assigned from Initiator */
399 u32 exp_stat_sn;
400 /* StatSN assigned to this ITT */
401 u32 stat_sn;
402 /* DataSN Counter */
403 u32 data_sn;
404 /* R2TSN Counter */
405 u32 r2t_sn;
406 /* Last DataSN acknowledged via DataAck SNACK */
407 u32 acked_data_sn;
408 /* Used for echoing NOPOUT ping data */
409 u32 buf_ptr_size;
410 /* Used to store DataDigest */
411 u32 data_crc;
412 /* Counter for MaxOutstandingR2T */
413 u32 outstanding_r2ts;
414 /* Next R2T Offset when DataSequenceInOrder=Yes */
415 u32 r2t_offset;
416 /* Iovec current and orig count for iscsi_cmd->iov_data */
417 u32 iov_data_count;
418 u32 orig_iov_data_count;
419 /* Number of miscellaneous iovecs used for IP stack calls */
420 u32 iov_misc_count;
421 /* Number of struct iscsi_pdu in struct iscsi_cmd->pdu_list */
422 u32 pdu_count;
423 /* Next struct iscsi_pdu to send in struct iscsi_cmd->pdu_list */
424 u32 pdu_send_order;
425 /* Current struct iscsi_pdu in struct iscsi_cmd->pdu_list */
426 u32 pdu_start;
427 /* Next struct iscsi_seq to send in struct iscsi_cmd->seq_list */
428 u32 seq_send_order;
429 /* Number of struct iscsi_seq in struct iscsi_cmd->seq_list */
430 u32 seq_count;
431 /* Current struct iscsi_seq in struct iscsi_cmd->seq_list */
432 u32 seq_no;
433 /* Lowest offset in current DataOUT sequence */
434 u32 seq_start_offset;
435 /* Highest offset in current DataOUT sequence */
436 u32 seq_end_offset;
437 /* Total size in bytes received so far of READ data */
438 u32 read_data_done;
439 /* Total size in bytes received so far of WRITE data */
440 u32 write_data_done;
441 /* Counter for FirstBurstLength key */
442 u32 first_burst_len;
443 /* Counter for MaxBurstLength key */
444 u32 next_burst_len;
445 /* Transfer size used for IP stack calls */
446 u32 tx_size;
447 /* Buffer used for various purposes */
448 void *buf_ptr;
449 /* Used by SendTargets=[iqn.,eui.] discovery */
450 void *text_in_ptr;
451 /* See include/linux/dma-mapping.h */
452 enum dma_data_direction data_direction;
453 /* iSCSI PDU Header + CRC */
454 unsigned char pdu[ISCSI_HDR_LEN + ISCSI_CRC_LEN];
455 /* Number of times struct iscsi_cmd is present in immediate queue */
456 atomic_t immed_queue_count;
457 atomic_t response_queue_count;
458 spinlock_t datain_lock;
459 spinlock_t dataout_timeout_lock;
460 /* spinlock for protecting struct iscsi_cmd->i_state */
461 spinlock_t istate_lock;
462 /* spinlock for adding within command recovery entries */
463 spinlock_t error_lock;
464 /* spinlock for adding R2Ts */
465 spinlock_t r2t_lock;
466 /* DataIN List */
467 struct list_head datain_list;
468 /* R2T List */
469 struct list_head cmd_r2t_list;
470 /* Timer for DataOUT */
471 struct timer_list dataout_timer;
472 /* Iovecs for SCSI data payload RX/TX w/ kernel level sockets */
473 struct kvec *iov_data;
474 /* Iovecs for miscellaneous purposes */
475 #define ISCSI_MISC_IOVECS 5
476 struct kvec iov_misc[ISCSI_MISC_IOVECS];
477 /* Array of struct iscsi_pdu used for DataPDUInOrder=No */
478 struct iscsi_pdu *pdu_list;
479 /* Current struct iscsi_pdu used for DataPDUInOrder=No */
480 struct iscsi_pdu *pdu_ptr;
481 /* Array of struct iscsi_seq used for DataSequenceInOrder=No */
482 struct iscsi_seq *seq_list;
483 /* Current struct iscsi_seq used for DataSequenceInOrder=No */
484 struct iscsi_seq *seq_ptr;
485 /* TMR Request when iscsi_opcode == ISCSI_OP_SCSI_TMFUNC */
486 struct iscsi_tmr_req *tmr_req;
487 /* Connection this command is alligient to */
488 struct iscsi_conn *conn;
489 /* Pointer to connection recovery entry */
490 struct iscsi_conn_recovery *cr;
491 /* Session the command is part of, used for connection recovery */
492 struct iscsi_session *sess;
493 /* list_head for connection list */
494 struct list_head i_conn_node;
495 /* The TCM I/O descriptor that is accessed via container_of() */
496 struct se_cmd se_cmd;
497 /* Sense buffer that will be mapped into outgoing status */
498 #define ISCSI_SENSE_BUFFER_LEN (TRANSPORT_SENSE_BUFFER + 2)
499 unsigned char sense_buffer[ISCSI_SENSE_BUFFER_LEN];
500
501 u32 padding;
502 u8 pad_bytes[4];
503
504 struct scatterlist *first_data_sg;
505 u32 first_data_sg_off;
506 u32 kmapped_nents;
507 sense_reason_t sense_reason;
508 } ____cacheline_aligned;
509
510 struct iscsi_tmr_req {
511 bool task_reassign:1;
512 u32 exp_data_sn;
513 struct iscsi_cmd *ref_cmd;
514 struct iscsi_conn_recovery *conn_recovery;
515 struct se_tmr_req *se_tmr_req;
516 };
517
518 struct iscsi_conn {
519 wait_queue_head_t queues_wq;
520 /* Authentication Successful for this connection */
521 u8 auth_complete;
522 /* State connection is currently in */
523 u8 conn_state;
524 u8 conn_logout_reason;
525 u8 network_transport;
526 enum iscsi_timer_flags_table nopin_timer_flags;
527 enum iscsi_timer_flags_table nopin_response_timer_flags;
528 /* Used to know what thread encountered a transport failure */
529 u8 which_thread;
530 /* connection id assigned by the Initiator */
531 u16 cid;
532 /* Remote TCP Port */
533 u16 login_port;
534 int net_size;
535 int login_family;
536 u32 auth_id;
537 u32 conn_flags;
538 /* Used for iscsi_tx_login_rsp() */
539 itt_t login_itt;
540 u32 exp_statsn;
541 /* Per connection status sequence number */
542 u32 stat_sn;
543 struct sockaddr_storage login_sockaddr;
544 struct sockaddr_storage local_sockaddr;
545 int conn_usage_count;
546 int conn_waiting_on_uc;
547 atomic_t check_immediate_queue;
548 atomic_t conn_logout_remove;
549 atomic_t connection_exit;
550 atomic_t connection_recovery;
551 atomic_t connection_reinstatement;
552 atomic_t connection_wait_rcfr;
553 atomic_t sleep_on_conn_wait_comp;
554 atomic_t transport_failed;
555 struct completion conn_post_wait_comp;
556 struct completion conn_wait_comp;
557 struct completion conn_wait_rcfr_comp;
558 struct completion conn_waiting_on_uc_comp;
559 struct completion conn_logout_comp;
560 struct completion tx_half_close_comp;
561 struct completion rx_half_close_comp;
562 /* socket used by this connection */
563 struct socket *sock;
564 void (*orig_data_ready)(struct sock *);
565 void (*orig_state_change)(struct sock *);
566 #define LOGIN_FLAGS_READ_ACTIVE 1
567 #define LOGIN_FLAGS_CLOSED 2
568 #define LOGIN_FLAGS_READY 4
569 #define LOGIN_FLAGS_INITIAL_PDU 8
570 unsigned long login_flags;
571 struct delayed_work login_work;
572 struct iscsi_login *login;
573 struct timer_list nopin_timer;
574 struct timer_list nopin_response_timer;
575 struct timer_list transport_timer;
576 struct task_struct *login_kworker;
577 /* Spinlock used for add/deleting cmd's from conn_cmd_list */
578 spinlock_t cmd_lock;
579 spinlock_t conn_usage_lock;
580 spinlock_t immed_queue_lock;
581 spinlock_t nopin_timer_lock;
582 spinlock_t response_queue_lock;
583 spinlock_t state_lock;
584 /* libcrypto RX and TX contexts for crc32c */
585 struct ahash_request *conn_rx_hash;
586 struct ahash_request *conn_tx_hash;
587 /* Used for scheduling TX and RX connection kthreads */
588 cpumask_var_t conn_cpumask;
589 unsigned int conn_rx_reset_cpumask:1;
590 unsigned int conn_tx_reset_cpumask:1;
591 /* list_head of struct iscsi_cmd for this connection */
592 struct list_head conn_cmd_list;
593 struct list_head immed_queue_list;
594 struct list_head response_queue_list;
595 struct iscsi_conn_ops *conn_ops;
596 struct iscsi_login *conn_login;
597 struct iscsit_transport *conn_transport;
598 struct iscsi_param_list *param_list;
599 /* Used for per connection auth state machine */
600 void *auth_protocol;
601 void *context;
602 struct iscsi_login_thread_s *login_thread;
603 struct iscsi_portal_group *tpg;
604 struct iscsi_tpg_np *tpg_np;
605 /* Pointer to parent session */
606 struct iscsi_session *sess;
607 int bitmap_id;
608 int rx_thread_active;
609 struct task_struct *rx_thread;
610 struct completion rx_login_comp;
611 int tx_thread_active;
612 struct task_struct *tx_thread;
613 /* list_head for session connection list */
614 struct list_head conn_list;
615 } ____cacheline_aligned;
616
617 struct iscsi_conn_recovery {
618 u16 cid;
619 u32 cmd_count;
620 u32 maxrecvdatasegmentlength;
621 u32 maxxmitdatasegmentlength;
622 int ready_for_reallegiance;
623 struct list_head conn_recovery_cmd_list;
624 spinlock_t conn_recovery_cmd_lock;
625 struct timer_list time2retain_timer;
626 struct iscsi_session *sess;
627 struct list_head cr_list;
628 } ____cacheline_aligned;
629
630 struct iscsi_session {
631 u8 initiator_vendor;
632 u8 isid[6];
633 enum iscsi_timer_flags_table time2retain_timer_flags;
634 u8 version_active;
635 u16 cid_called;
636 u16 conn_recovery_count;
637 u16 tsih;
638 /* state session is currently in */
639 u32 session_state;
640 /* session wide counter: initiator assigned task tag */
641 itt_t init_task_tag;
642 /* session wide counter: target assigned task tag */
643 u32 targ_xfer_tag;
644 u32 cmdsn_window;
645
646 /* protects cmdsn values */
647 struct mutex cmdsn_mutex;
648 /* session wide counter: expected command sequence number */
649 u32 exp_cmd_sn;
650 /* session wide counter: maximum allowed command sequence number */
651 atomic_t max_cmd_sn;
652 struct list_head sess_ooo_cmdsn_list;
653
654 /* LIO specific session ID */
655 u32 sid;
656 char auth_type[8];
657 /* unique within the target */
658 int session_index;
659 /* Used for session reference counting */
660 int session_usage_count;
661 int session_waiting_on_uc;
662 atomic_long_t cmd_pdus;
663 atomic_long_t rsp_pdus;
664 atomic_long_t tx_data_octets;
665 atomic_long_t rx_data_octets;
666 atomic_long_t conn_digest_errors;
667 atomic_long_t conn_timeout_errors;
668 u64 creation_time;
669 /* Number of active connections */
670 atomic_t nconn;
671 atomic_t session_continuation;
672 atomic_t session_fall_back_to_erl0;
673 atomic_t session_logout;
674 atomic_t session_reinstatement;
675 atomic_t session_stop_active;
676 atomic_t sleep_on_sess_wait_comp;
677 /* connection list */
678 struct list_head sess_conn_list;
679 struct list_head cr_active_list;
680 struct list_head cr_inactive_list;
681 spinlock_t conn_lock;
682 spinlock_t cr_a_lock;
683 spinlock_t cr_i_lock;
684 spinlock_t session_usage_lock;
685 spinlock_t ttt_lock;
686 struct completion async_msg_comp;
687 struct completion reinstatement_comp;
688 struct completion session_wait_comp;
689 struct completion session_waiting_on_uc_comp;
690 struct timer_list time2retain_timer;
691 struct iscsi_sess_ops *sess_ops;
692 struct se_session *se_sess;
693 struct iscsi_portal_group *tpg;
694 } ____cacheline_aligned;
695
696 struct iscsi_login {
697 u8 auth_complete;
698 u8 checked_for_existing;
699 u8 current_stage;
700 u8 leading_connection;
701 u8 first_request;
702 u8 version_min;
703 u8 version_max;
704 u8 login_complete;
705 u8 login_failed;
706 bool zero_tsih;
707 char isid[6];
708 u32 cmd_sn;
709 itt_t init_task_tag;
710 u32 initial_exp_statsn;
711 u32 rsp_length;
712 u16 cid;
713 u16 tsih;
714 char req[ISCSI_HDR_LEN];
715 char rsp[ISCSI_HDR_LEN];
716 char *req_buf;
717 char *rsp_buf;
718 struct iscsi_conn *conn;
719 struct iscsi_np *np;
720 } ____cacheline_aligned;
721
722 struct iscsi_node_attrib {
723 u32 dataout_timeout;
724 u32 dataout_timeout_retries;
725 u32 default_erl;
726 u32 nopin_timeout;
727 u32 nopin_response_timeout;
728 u32 random_datain_pdu_offsets;
729 u32 random_datain_seq_offsets;
730 u32 random_r2t_offsets;
731 u32 tmr_cold_reset;
732 u32 tmr_warm_reset;
733 struct iscsi_node_acl *nacl;
734 };
735
736 struct se_dev_entry_s;
737
738 struct iscsi_node_auth {
739 enum naf_flags_table naf_flags;
740 int authenticate_target;
741 /* Used for iscsit_global->discovery_auth,
742 * set to zero (auth disabled) by default */
743 int enforce_discovery_auth;
744 #define MAX_USER_LEN 256
745 #define MAX_PASS_LEN 256
746 char userid[MAX_USER_LEN];
747 char password[MAX_PASS_LEN];
748 char userid_mutual[MAX_USER_LEN];
749 char password_mutual[MAX_PASS_LEN];
750 };
751
752 #include "iscsi_target_stat.h"
753
754 struct iscsi_node_stat_grps {
755 struct config_group iscsi_sess_stats_group;
756 struct config_group iscsi_conn_stats_group;
757 };
758
759 struct iscsi_node_acl {
760 struct se_node_acl se_node_acl;
761 struct iscsi_node_attrib node_attrib;
762 struct iscsi_node_auth node_auth;
763 struct iscsi_node_stat_grps node_stat_grps;
764 };
765
766 struct iscsi_tpg_attrib {
767 u32 authentication;
768 u32 login_timeout;
769 u32 netif_timeout;
770 u32 generate_node_acls;
771 u32 cache_dynamic_acls;
772 u32 default_cmdsn_depth;
773 u32 demo_mode_write_protect;
774 u32 prod_mode_write_protect;
775 u32 demo_mode_discovery;
776 u32 default_erl;
777 u8 t10_pi;
778 u32 fabric_prot_type;
779 u32 tpg_enabled_sendtargets;
780 u32 login_keys_workaround;
781 struct iscsi_portal_group *tpg;
782 };
783
784 struct iscsi_np {
785 int np_network_transport;
786 int np_ip_proto;
787 int np_sock_type;
788 enum np_thread_state_table np_thread_state;
789 bool enabled;
790 atomic_t np_reset_count;
791 enum iscsi_timer_flags_table np_login_timer_flags;
792 u32 np_exports;
793 enum np_flags_table np_flags;
794 spinlock_t np_thread_lock;
795 struct completion np_restart_comp;
796 struct socket *np_socket;
797 struct sockaddr_storage np_sockaddr;
798 struct task_struct *np_thread;
799 struct timer_list np_login_timer;
800 void *np_context;
801 struct iscsit_transport *np_transport;
802 struct list_head np_list;
803 } ____cacheline_aligned;
804
805 struct iscsi_tpg_np {
806 struct iscsi_np *tpg_np;
807 struct iscsi_portal_group *tpg;
808 struct iscsi_tpg_np *tpg_np_parent;
809 struct list_head tpg_np_list;
810 struct list_head tpg_np_child_list;
811 struct list_head tpg_np_parent_list;
812 struct se_tpg_np se_tpg_np;
813 spinlock_t tpg_np_parent_lock;
814 struct completion tpg_np_comp;
815 struct kref tpg_np_kref;
816 };
817
818 struct iscsi_portal_group {
819 unsigned char tpg_chap_id;
820 /* TPG State */
821 enum tpg_state_table tpg_state;
822 /* Target Portal Group Tag */
823 u16 tpgt;
824 /* Id assigned to target sessions */
825 u16 ntsih;
826 /* Number of active sessions */
827 u32 nsessions;
828 /* Number of Network Portals available for this TPG */
829 u32 num_tpg_nps;
830 /* Per TPG LIO specific session ID. */
831 u32 sid;
832 /* Spinlock for adding/removing Network Portals */
833 spinlock_t tpg_np_lock;
834 spinlock_t tpg_state_lock;
835 struct se_portal_group tpg_se_tpg;
836 struct mutex tpg_access_lock;
837 struct semaphore np_login_sem;
838 struct iscsi_tpg_attrib tpg_attrib;
839 struct iscsi_node_auth tpg_demo_auth;
840 /* Pointer to default list of iSCSI parameters for TPG */
841 struct iscsi_param_list *param_list;
842 struct iscsi_tiqn *tpg_tiqn;
843 struct list_head tpg_gnp_list;
844 struct list_head tpg_list;
845 } ____cacheline_aligned;
846
847 struct iscsi_wwn_stat_grps {
848 struct config_group iscsi_stat_group;
849 struct config_group iscsi_instance_group;
850 struct config_group iscsi_sess_err_group;
851 struct config_group iscsi_tgt_attr_group;
852 struct config_group iscsi_login_stats_group;
853 struct config_group iscsi_logout_stats_group;
854 };
855
856 struct iscsi_tiqn {
857 #define ISCSI_IQN_LEN 224
858 unsigned char tiqn[ISCSI_IQN_LEN];
859 enum tiqn_state_table tiqn_state;
860 int tiqn_access_count;
861 u32 tiqn_active_tpgs;
862 u32 tiqn_ntpgs;
863 u32 tiqn_num_tpg_nps;
864 u32 tiqn_nsessions;
865 struct list_head tiqn_list;
866 struct list_head tiqn_tpg_list;
867 spinlock_t tiqn_state_lock;
868 spinlock_t tiqn_tpg_lock;
869 struct se_wwn tiqn_wwn;
870 struct iscsi_wwn_stat_grps tiqn_stat_grps;
871 int tiqn_index;
872 struct iscsi_sess_err_stats sess_err_stats;
873 struct iscsi_login_stats login_stats;
874 struct iscsi_logout_stats logout_stats;
875 } ____cacheline_aligned;
876
877 struct iscsit_global {
878 /* In core shutdown */
879 u32 in_shutdown;
880 u32 active_ts;
881 /* Unique identifier used for the authentication daemon */
882 u32 auth_id;
883 u32 inactive_ts;
884 #define ISCSIT_BITMAP_BITS 262144
885 /* Thread Set bitmap pointer */
886 unsigned long *ts_bitmap;
887 spinlock_t ts_bitmap_lock;
888 /* Used for iSCSI discovery session authentication */
889 struct iscsi_node_acl discovery_acl;
890 struct iscsi_portal_group *discovery_tpg;
891 };
892
893 static inline u32 session_get_next_ttt(struct iscsi_session *session)
894 {
895 u32 ttt;
896
897 spin_lock_bh(&session->ttt_lock);
898 ttt = session->targ_xfer_tag++;
899 if (ttt == 0xFFFFFFFF)
900 ttt = session->targ_xfer_tag++;
901 spin_unlock_bh(&session->ttt_lock);
902
903 return ttt;
904 }
905
906 extern struct iscsi_cmd *iscsit_find_cmd_from_itt(struct iscsi_conn *, itt_t);
907
908 static inline void iscsit_thread_check_cpumask(
909 struct iscsi_conn *conn,
910 struct task_struct *p,
911 int mode)
912 {
913 /*
914 * mode == 1 signals iscsi_target_tx_thread() usage.
915 * mode == 0 signals iscsi_target_rx_thread() usage.
916 */
917 if (mode == 1) {
918 if (!conn->conn_tx_reset_cpumask)
919 return;
920 conn->conn_tx_reset_cpumask = 0;
921 } else {
922 if (!conn->conn_rx_reset_cpumask)
923 return;
924 conn->conn_rx_reset_cpumask = 0;
925 }
926 /*
927 * Update the CPU mask for this single kthread so that
928 * both TX and RX kthreads are scheduled to run on the
929 * same CPU.
930 */
931 set_cpus_allowed_ptr(p, conn->conn_cpumask);
932 }
933 #endif /* ISCSI_TARGET_CORE_H */
Linux with added FPC-III support