Line data Source code
1 : /* SPDX-License-Identifier: BSD-3-Clause
2 : * Copyright (C) 2008-2012 Daisuke Aoyama <aoyama@peach.ne.jp>.
3 : * Copyright (C) 2016 Intel Corporation.
4 : * All rights reserved.
5 : */
6 :
7 : #ifndef SPDK_ISCSI_H
8 : #define SPDK_ISCSI_H
9 :
10 : #include "spdk/stdinc.h"
11 : #include "spdk/env.h"
12 : #include "spdk/bdev.h"
13 : #include "spdk/iscsi_spec.h"
14 : #include "spdk/thread.h"
15 : #include "spdk/sock.h"
16 :
17 : #include "spdk/scsi.h"
18 : #include "iscsi/param.h"
19 :
20 : #include "spdk/assert.h"
21 : #include "spdk/dif.h"
22 : #include "spdk/util.h"
23 :
24 : #define SPDK_ISCSI_DEFAULT_NODEBASE "iqn.2016-06.io.spdk"
25 :
26 : #define DEFAULT_MAXR2T 4
27 : #define MAX_INITIATOR_PORT_NAME 256
28 : #define MAX_INITIATOR_NAME 223
29 : #define MAX_TARGET_NAME 223
30 :
31 : #define MAX_PORTAL 1024
32 : #define MAX_INITIATOR 256
33 : #define MAX_NETMASK 256
34 : #define MAX_ISCSI_CONNECTIONS 1024
35 : #define MAX_PORTAL_ADDR 256
36 : #define MAX_PORTAL_PORT 32
37 :
38 : #define DEFAULT_PORT 3260
39 : #define DEFAULT_MAX_SESSIONS 128
40 : #define DEFAULT_MAX_CONNECTIONS_PER_SESSION 2
41 : #define DEFAULT_MAXOUTSTANDINGR2T 1
42 : #define DEFAULT_DEFAULTTIME2WAIT 2
43 : #define DEFAULT_DEFAULTTIME2RETAIN 20
44 : #define DEFAULT_INITIALR2T true
45 : #define DEFAULT_IMMEDIATEDATA true
46 : #define DEFAULT_DATAPDUINORDER true
47 : #define DEFAULT_DATASEQUENCEINORDER true
48 : #define DEFAULT_ERRORRECOVERYLEVEL 0
49 : #define DEFAULT_TIMEOUT 60
50 : #define MAX_NOPININTERVAL 60
51 : #define DEFAULT_NOPININTERVAL 30
52 :
53 : /*
54 : * SPDK iSCSI target currently only supports 64KB as the maximum data segment length
55 : * it can receive from initiators. Other values may work, but no guarantees.
56 : */
57 : #define SPDK_ISCSI_MAX_RECV_DATA_SEGMENT_LENGTH 65536
58 :
59 : /*
60 : * Defines maximum number of data out buffers each connection can have in
61 : * use at any given time.
62 : */
63 : #define MAX_DATA_OUT_PER_CONNECTION 16
64 :
65 : /*
66 : * Defines default maximum number of data in buffers each connection can have in
67 : * use at any given time. So this limit does not affect I/O smaller than
68 : * SPDK_BDEV_SMALL_BUF_MAX_SIZE.
69 : */
70 : #define DEFAULT_MAX_LARGE_DATAIN_PER_CONNECTION 64
71 :
72 : #define SPDK_ISCSI_MAX_BURST_LENGTH \
73 : (SPDK_ISCSI_MAX_RECV_DATA_SEGMENT_LENGTH * MAX_DATA_OUT_PER_CONNECTION)
74 :
75 : /*
76 : * Defines default maximum amount in bytes of unsolicited data the iSCSI
77 : * initiator may send to the SPDK iSCSI target during the execution of
78 : * a single SCSI command. And it is smaller than the MaxBurstLength.
79 : */
80 : #define SPDK_ISCSI_FIRST_BURST_LENGTH 8192
81 :
82 : /*
83 : * Defines minimum amount in bytes of unsolicited data the iSCSI initiator
84 : * may send to the SPDK iSCSI target during the execution of a single
85 : * SCSI command.
86 : */
87 : #define SPDK_ISCSI_MIN_FIRST_BURST_LENGTH 512
88 :
89 : #define SPDK_ISCSI_MAX_FIRST_BURST_LENGTH 16777215
90 :
91 : /*
92 : * Defines default maximum queue depth per connection and this can be
93 : * changed by configuration file.
94 : */
95 : #define DEFAULT_MAX_QUEUE_DEPTH 64
96 :
97 : /** Defines how long we should wait for a logout request when the target
98 : * requests logout to the initiator asynchronously.
99 : */
100 : #define ISCSI_LOGOUT_REQUEST_TIMEOUT 30 /* in seconds */
101 :
102 : /** Defines how long we should wait for a TCP close after responding to a
103 : * logout request, before terminating the connection ourselves.
104 : */
105 : #define ISCSI_LOGOUT_TIMEOUT 5 /* in seconds */
106 :
107 : /** Defines how long we should wait until login process completes. */
108 : #define ISCSI_LOGIN_TIMEOUT 30 /* in seconds */
109 :
110 : /* For spdk_iscsi_login_in related function use, we need to avoid the conflict
111 : * with other errors
112 : * */
113 : #define SPDK_ISCSI_LOGIN_ERROR_RESPONSE -1000
114 : #define SPDK_ISCSI_LOGIN_ERROR_PARAMETER -1001
115 : #define SPDK_ISCSI_PARAMETER_EXCHANGE_NOT_ONCE -1002
116 :
117 : #define ISCSI_AHS_LEN 60
118 :
119 : struct spdk_mobj {
120 : struct spdk_mempool *mp;
121 : void *buf;
122 : uint32_t data_len;
123 : };
124 :
125 : /*
126 : * Maximum number of SGL elements, i.e.,
127 : * BHS, AHS, Header Digest, Data Segment and Data Digest.
128 : */
129 : #define SPDK_ISCSI_MAX_SGL_DESCRIPTORS (5)
130 :
131 : #define SPDK_CRC32C_INITIAL 0xffffffffUL
132 : #define SPDK_CRC32C_XOR 0xffffffffUL
133 :
134 : typedef void (*iscsi_conn_xfer_complete_cb)(void *cb_arg);
135 :
136 : struct spdk_iscsi_pdu {
137 : struct iscsi_bhs bhs;
138 :
139 : /* Merge multiple Data-OUT PDUs in a sequence into a subtask up to
140 : * SPDK_ISCSI_MAX_RECV_DATA_SEGMENT_LENGTH or the final PDU comes.
141 : *
142 : * Both the size of a data buffer and MaxRecvDataSegmentLength are
143 : * SPDK_ISCSI_MAX_RECV_DATA_SEGMENT_LENGTH at most. Hence the data segment of
144 : * a Data-OUT PDU can be split into two data buffers at most.
145 : */
146 : struct spdk_mobj *mobj[2];
147 :
148 : bool is_rejected;
149 : uint8_t *data;
150 : uint8_t header_digest[ISCSI_DIGEST_LEN];
151 : uint8_t data_digest[ISCSI_DIGEST_LEN];
152 : size_t data_segment_len;
153 : int bhs_valid_bytes;
154 : int ahs_valid_bytes;
155 : uint32_t data_valid_bytes;
156 : int hdigest_valid_bytes;
157 : int ddigest_valid_bytes;
158 : int ref;
159 : bool data_from_mempool; /* indicate whether the data buffer is allocated from mempool */
160 : struct spdk_iscsi_task *task; /* data tied to a task buffer */
161 : uint32_t cmd_sn;
162 : uint32_t writev_offset;
163 : uint32_t data_buf_len;
164 : uint32_t data_offset;
165 : uint32_t crc32c;
166 : bool dif_insert_or_strip;
167 : struct spdk_dif_ctx dif_ctx;
168 : struct spdk_iscsi_conn *conn;
169 :
170 : iscsi_conn_xfer_complete_cb cb_fn;
171 : void *cb_arg;
172 :
173 : /* The sock request ends with a 0 length iovec. Place the actual iovec immediately
174 : * after it. There is a static assert below to check if the compiler inserted
175 : * any unwanted padding */
176 : int32_t mapped_length;
177 : struct spdk_sock_request sock_req;
178 : struct iovec iov[SPDK_ISCSI_MAX_SGL_DESCRIPTORS];
179 : TAILQ_ENTRY(spdk_iscsi_pdu) tailq;
180 :
181 :
182 : /*
183 : * 60 bytes of AHS should suffice for now.
184 : * This should always be at the end of PDU data structure.
185 : * we need to not zero this out when doing memory clear.
186 : */
187 : uint8_t ahs[ISCSI_AHS_LEN];
188 :
189 : struct {
190 : uint16_t length; /* iSCSI SenseLength (big-endian) */
191 : uint8_t data[32];
192 : } sense;
193 : };
194 : SPDK_STATIC_ASSERT(offsetof(struct spdk_iscsi_pdu,
195 : sock_req) + sizeof(struct spdk_sock_request) == offsetof(struct spdk_iscsi_pdu, iov),
196 : "Compiler inserted padding between iov and sock_req");
197 :
198 : enum iscsi_connection_state {
199 : ISCSI_CONN_STATE_INVALID = 0,
200 : ISCSI_CONN_STATE_RUNNING = 1,
201 : ISCSI_CONN_STATE_EXITING = 2,
202 : ISCSI_CONN_STATE_EXITED = 3,
203 : };
204 :
205 : enum iscsi_chap_phase {
206 : ISCSI_CHAP_PHASE_NONE = 0,
207 : ISCSI_CHAP_PHASE_WAIT_A = 1,
208 : ISCSI_CHAP_PHASE_WAIT_NR = 2,
209 : ISCSI_CHAP_PHASE_END = 3,
210 : };
211 :
212 : enum session_type {
213 : SESSION_TYPE_INVALID = 0,
214 : SESSION_TYPE_NORMAL = 1,
215 : SESSION_TYPE_DISCOVERY = 2,
216 : };
217 :
218 : #define ISCSI_CHAP_CHALLENGE_LEN 1024
219 : #define ISCSI_CHAP_MAX_USER_LEN 255
220 : #define ISCSI_CHAP_MAX_SECRET_LEN 255
221 :
222 : struct iscsi_chap_auth {
223 : enum iscsi_chap_phase chap_phase;
224 :
225 : char user[ISCSI_CHAP_MAX_USER_LEN + 1];
226 : char secret[ISCSI_CHAP_MAX_SECRET_LEN + 1];
227 : char muser[ISCSI_CHAP_MAX_USER_LEN + 1];
228 : char msecret[ISCSI_CHAP_MAX_SECRET_LEN + 1];
229 :
230 : uint8_t chap_id[1];
231 : uint8_t chap_mid[1];
232 : int chap_challenge_len;
233 : uint8_t chap_challenge[ISCSI_CHAP_CHALLENGE_LEN];
234 : int chap_mchallenge_len;
235 : uint8_t chap_mchallenge[ISCSI_CHAP_CHALLENGE_LEN];
236 : };
237 :
238 : struct spdk_iscsi_auth_secret {
239 : char user[ISCSI_CHAP_MAX_USER_LEN + 1];
240 : char secret[ISCSI_CHAP_MAX_SECRET_LEN + 1];
241 : char muser[ISCSI_CHAP_MAX_USER_LEN + 1];
242 : char msecret[ISCSI_CHAP_MAX_SECRET_LEN + 1];
243 : TAILQ_ENTRY(spdk_iscsi_auth_secret) tailq;
244 : };
245 :
246 : struct spdk_iscsi_auth_group {
247 : int32_t tag;
248 : TAILQ_HEAD(, spdk_iscsi_auth_secret) secret_head;
249 : TAILQ_ENTRY(spdk_iscsi_auth_group) tailq;
250 : };
251 :
252 : struct spdk_iscsi_sess {
253 : uint32_t connections;
254 : struct spdk_iscsi_conn **conns;
255 :
256 : struct spdk_scsi_port *initiator_port;
257 : int tag;
258 :
259 : uint64_t isid;
260 : uint16_t tsih;
261 : struct spdk_iscsi_tgt_node *target;
262 : int queue_depth;
263 :
264 : struct iscsi_param *params;
265 :
266 : enum session_type session_type;
267 : uint32_t MaxConnections;
268 : uint32_t MaxOutstandingR2T;
269 : uint32_t DefaultTime2Wait;
270 : uint32_t DefaultTime2Retain;
271 : uint32_t FirstBurstLength;
272 : uint32_t MaxBurstLength;
273 : bool InitialR2T;
274 : bool ImmediateData;
275 : bool DataPDUInOrder;
276 : bool DataSequenceInOrder;
277 : uint32_t ErrorRecoveryLevel;
278 :
279 : uint32_t ExpCmdSN;
280 : uint32_t MaxCmdSN;
281 :
282 : uint32_t current_text_itt;
283 : };
284 :
285 : struct spdk_iscsi_poll_group {
286 : struct spdk_poller *poller;
287 : struct spdk_poller *nop_poller;
288 : STAILQ_HEAD(connections, spdk_iscsi_conn) connections;
289 : struct spdk_sock_group *sock_group;
290 : TAILQ_ENTRY(spdk_iscsi_poll_group) link;
291 : uint32_t num_active_targets;
292 : };
293 :
294 : struct spdk_iscsi_opts {
295 : char *authfile;
296 : char *nodebase;
297 : int32_t timeout;
298 : int32_t nopininterval;
299 : bool disable_chap;
300 : bool require_chap;
301 : bool mutual_chap;
302 : int32_t chap_group;
303 : uint32_t MaxSessions;
304 : uint32_t MaxConnectionsPerSession;
305 : uint32_t MaxConnections;
306 : uint32_t MaxQueueDepth;
307 : uint32_t DefaultTime2Wait;
308 : uint32_t DefaultTime2Retain;
309 : uint32_t FirstBurstLength;
310 : bool ImmediateData;
311 : uint32_t ErrorRecoveryLevel;
312 : bool AllowDuplicateIsid;
313 : uint32_t MaxLargeDataInPerConnection;
314 : uint32_t MaxR2TPerConnection;
315 : uint32_t pdu_pool_size;
316 : uint32_t immediate_data_pool_size;
317 : uint32_t data_out_pool_size;
318 : };
319 :
320 : struct spdk_iscsi_globals {
321 : char *authfile;
322 : char *nodebase;
323 : pthread_mutex_t mutex;
324 : uint32_t refcnt;
325 : TAILQ_HEAD(, spdk_iscsi_portal) portal_head;
326 : TAILQ_HEAD(, spdk_iscsi_portal_grp) pg_head;
327 : TAILQ_HEAD(, spdk_iscsi_init_grp) ig_head;
328 : TAILQ_HEAD(, spdk_iscsi_tgt_node) target_head;
329 : TAILQ_HEAD(, spdk_iscsi_auth_group) auth_group_head;
330 : TAILQ_HEAD(, spdk_iscsi_poll_group) poll_group_head;
331 :
332 : int32_t timeout;
333 : int32_t nopininterval;
334 : bool disable_chap;
335 : bool require_chap;
336 : bool mutual_chap;
337 : int32_t chap_group;
338 :
339 : uint32_t MaxSessions;
340 : uint32_t MaxConnectionsPerSession;
341 : uint32_t MaxConnections;
342 : uint32_t MaxQueueDepth;
343 : uint32_t DefaultTime2Wait;
344 : uint32_t DefaultTime2Retain;
345 : uint32_t FirstBurstLength;
346 : bool ImmediateData;
347 : uint32_t ErrorRecoveryLevel;
348 : bool AllowDuplicateIsid;
349 : uint32_t MaxLargeDataInPerConnection;
350 : uint32_t MaxR2TPerConnection;
351 : uint32_t pdu_pool_size;
352 : uint32_t immediate_data_pool_size;
353 : uint32_t data_out_pool_size;
354 :
355 : struct spdk_mempool *pdu_pool;
356 : struct spdk_mempool *pdu_immediate_data_pool;
357 : struct spdk_mempool *pdu_data_out_pool;
358 : struct spdk_mempool *session_pool;
359 : struct spdk_mempool *task_pool;
360 :
361 : struct spdk_iscsi_sess **session;
362 : };
363 :
364 : #define ISCSI_SECURITY_NEGOTIATION_PHASE 0
365 : #define ISCSI_OPERATIONAL_NEGOTIATION_PHASE 1
366 : #define ISCSI_NSG_RESERVED_CODE 2
367 : #define ISCSI_FULL_FEATURE_PHASE 3
368 :
369 : /* logout reason */
370 : #define ISCSI_LOGOUT_REASON_CLOSE_SESSION 0
371 : #define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION 1
372 : #define ISCSI_LOGOUT_REASON_REMOVE_CONN_FOR_RECOVERY 2
373 :
374 : enum spdk_error_codes {
375 : SPDK_ISCSI_CONNECTION_FATAL = -1,
376 : SPDK_PDU_FATAL = -2,
377 : };
378 :
379 : #define DGET24(B) \
380 : ((( (uint32_t) *((uint8_t *)(B)+0)) << 16) \
381 : | (((uint32_t) *((uint8_t *)(B)+1)) << 8) \
382 : | (((uint32_t) *((uint8_t *)(B)+2)) << 0))
383 :
384 : #define DSET24(B,D) \
385 : (((*((uint8_t *)(B)+0)) = (uint8_t)((uint32_t)(D) >> 16)), \
386 : ((*((uint8_t *)(B)+1)) = (uint8_t)((uint32_t)(D) >> 8)), \
387 : ((*((uint8_t *)(B)+2)) = (uint8_t)((uint32_t)(D) >> 0)))
388 :
389 : #define xstrdup(s) (s ? strdup(s) : (char *)NULL)
390 :
391 : extern struct spdk_iscsi_globals g_iscsi;
392 : extern struct spdk_iscsi_opts *g_spdk_iscsi_opts;
393 :
394 : struct spdk_iscsi_task;
395 : struct spdk_json_write_ctx;
396 :
397 : typedef void (*spdk_iscsi_init_cb)(void *cb_arg, int rc);
398 :
399 : void spdk_iscsi_init(spdk_iscsi_init_cb cb_fn, void *cb_arg);
400 : typedef void (*spdk_iscsi_fini_cb)(void *arg);
401 : void spdk_iscsi_fini(spdk_iscsi_fini_cb cb_fn, void *cb_arg);
402 : void shutdown_iscsi_conns_done(void);
403 : void spdk_iscsi_config_json(struct spdk_json_write_ctx *w);
404 :
405 : struct spdk_iscsi_opts *iscsi_opts_alloc(void);
406 : void iscsi_opts_free(struct spdk_iscsi_opts *opts);
407 : struct spdk_iscsi_opts *iscsi_opts_copy(struct spdk_iscsi_opts *src);
408 : void iscsi_opts_info_json(struct spdk_json_write_ctx *w);
409 : int iscsi_set_discovery_auth(bool disable_chap, bool require_chap,
410 : bool mutual_chap, int32_t chap_group);
411 : int iscsi_chap_get_authinfo(struct iscsi_chap_auth *auth, const char *authuser,
412 : int ag_tag);
413 : int iscsi_add_auth_group(int32_t tag, struct spdk_iscsi_auth_group **_group);
414 : struct spdk_iscsi_auth_group *iscsi_find_auth_group_by_tag(int32_t tag);
415 : void iscsi_delete_auth_group(struct spdk_iscsi_auth_group *group);
416 : int iscsi_auth_group_add_secret(struct spdk_iscsi_auth_group *group,
417 : const char *user, const char *secret,
418 : const char *muser, const char *msecret);
419 : int iscsi_auth_group_delete_secret(struct spdk_iscsi_auth_group *group,
420 : const char *user);
421 : void iscsi_auth_groups_info_json(struct spdk_json_write_ctx *w);
422 :
423 : void iscsi_task_response(struct spdk_iscsi_conn *conn,
424 : struct spdk_iscsi_task *task);
425 : int iscsi_build_iovs(struct spdk_iscsi_conn *conn, struct iovec *iovs, int iovcnt,
426 : struct spdk_iscsi_pdu *pdu, uint32_t *mapped_length);
427 : int iscsi_handle_incoming_pdus(struct spdk_iscsi_conn *conn);
428 : void iscsi_task_mgmt_response(struct spdk_iscsi_conn *conn,
429 : struct spdk_iscsi_task *task);
430 :
431 : void iscsi_free_sess(struct spdk_iscsi_sess *sess);
432 : void iscsi_clear_all_transfer_task(struct spdk_iscsi_conn *conn,
433 : struct spdk_scsi_lun *lun,
434 : struct spdk_iscsi_pdu *pdu);
435 : bool iscsi_del_transfer_task(struct spdk_iscsi_conn *conn, uint32_t CmdSN);
436 :
437 : uint32_t iscsi_pdu_calc_header_digest(struct spdk_iscsi_pdu *pdu);
438 : uint32_t iscsi_pdu_calc_data_digest(struct spdk_iscsi_pdu *pdu);
439 :
440 : /* Memory management */
441 : void iscsi_put_pdu(struct spdk_iscsi_pdu *pdu);
442 : struct spdk_iscsi_pdu *iscsi_get_pdu(struct spdk_iscsi_conn *conn);
443 : void iscsi_op_abort_task_set(struct spdk_iscsi_task *task,
444 : uint8_t function);
445 : void iscsi_queue_task(struct spdk_iscsi_conn *conn, struct spdk_iscsi_task *task);
446 :
447 : static inline struct spdk_mobj *
448 7 : iscsi_datapool_get(struct spdk_mempool *pool)
449 : {
450 7 : return spdk_mempool_get(pool);
451 : }
452 :
453 : static inline void
454 0 : iscsi_datapool_put(struct spdk_mobj *mobj)
455 : {
456 0 : assert(mobj != NULL);
457 :
458 0 : mobj->data_len = 0;
459 0 : spdk_mempool_put(mobj->mp, (void *)mobj);
460 0 : }
461 :
462 : static inline uint32_t
463 27 : iscsi_get_max_immediate_data_size(void)
464 : {
465 : /*
466 : * Specify enough extra space in addition to FirstBurstLength to
467 : * account for a header digest, data digest and additional header
468 : * segments (AHS). These are not normally used but they do not
469 : * take up much space and we need to make sure the worst-case scenario
470 : * can be satisfied by the size returned here.
471 : */
472 54 : return g_iscsi.FirstBurstLength +
473 27 : ISCSI_DIGEST_LEN + /* data digest */
474 27 : ISCSI_DIGEST_LEN + /* header digest */
475 27 : 8 + /* bidirectional AHS */
476 : 52; /* extended CDB AHS (for a 64-byte CDB) */
477 : }
478 :
479 : #endif /* SPDK_ISCSI_H */
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