Commit | Line | Data |
---|---|---|
e48354ce NB |
1 | /******************************************************************************* |
2 | * This file contains the iSCSI Target specific Task Management functions. | |
3 | * | |
4 | * \u00a9 Copyright 2007-2011 RisingTide Systems LLC. | |
5 | * | |
6 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. | |
7 | * | |
8 | * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | ******************************************************************************/ | |
20 | ||
21 | #include <asm/unaligned.h> | |
22 | #include <scsi/iscsi_proto.h> | |
23 | #include <target/target_core_base.h> | |
24 | #include <target/target_core_transport.h> | |
25 | ||
26 | #include "iscsi_target_core.h" | |
27 | #include "iscsi_target_seq_pdu_list.h" | |
28 | #include "iscsi_target_datain_values.h" | |
29 | #include "iscsi_target_device.h" | |
30 | #include "iscsi_target_erl0.h" | |
31 | #include "iscsi_target_erl1.h" | |
32 | #include "iscsi_target_erl2.h" | |
33 | #include "iscsi_target_tmr.h" | |
34 | #include "iscsi_target_tpg.h" | |
35 | #include "iscsi_target_util.h" | |
36 | #include "iscsi_target.h" | |
37 | ||
38 | u8 iscsit_tmr_abort_task( | |
39 | struct iscsi_cmd *cmd, | |
40 | unsigned char *buf) | |
41 | { | |
42 | struct iscsi_cmd *ref_cmd; | |
43 | struct iscsi_conn *conn = cmd->conn; | |
44 | struct iscsi_tmr_req *tmr_req = cmd->tmr_req; | |
45 | struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; | |
46 | struct iscsi_tm *hdr = (struct iscsi_tm *) buf; | |
47 | ||
48 | ref_cmd = iscsit_find_cmd_from_itt(conn, hdr->rtt); | |
49 | if (!ref_cmd) { | |
50 | pr_err("Unable to locate RefTaskTag: 0x%08x on CID:" | |
51 | " %hu.\n", hdr->rtt, conn->cid); | |
52 | return ((hdr->refcmdsn >= conn->sess->exp_cmd_sn) && | |
53 | (hdr->refcmdsn <= conn->sess->max_cmd_sn)) ? | |
54 | ISCSI_TMF_RSP_COMPLETE : ISCSI_TMF_RSP_NO_TASK; | |
55 | } | |
56 | if (ref_cmd->cmd_sn != hdr->refcmdsn) { | |
57 | pr_err("RefCmdSN 0x%08x does not equal" | |
58 | " task's CmdSN 0x%08x. Rejecting ABORT_TASK.\n", | |
59 | hdr->refcmdsn, ref_cmd->cmd_sn); | |
60 | return ISCSI_TMF_RSP_REJECTED; | |
61 | } | |
62 | ||
63 | se_tmr->ref_task_tag = hdr->rtt; | |
64 | se_tmr->ref_cmd = &ref_cmd->se_cmd; | |
65 | tmr_req->ref_cmd_sn = hdr->refcmdsn; | |
66 | tmr_req->exp_data_sn = hdr->exp_datasn; | |
67 | ||
68 | return ISCSI_TMF_RSP_COMPLETE; | |
69 | } | |
70 | ||
71 | /* | |
72 | * Called from iscsit_handle_task_mgt_cmd(). | |
73 | */ | |
74 | int iscsit_tmr_task_warm_reset( | |
75 | struct iscsi_conn *conn, | |
76 | struct iscsi_tmr_req *tmr_req, | |
77 | unsigned char *buf) | |
78 | { | |
79 | struct iscsi_session *sess = conn->sess; | |
80 | struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); | |
81 | #if 0 | |
82 | struct iscsi_init_task_mgt_cmnd *hdr = | |
83 | (struct iscsi_init_task_mgt_cmnd *) buf; | |
84 | #endif | |
85 | if (!na->tmr_warm_reset) { | |
86 | pr_err("TMR Opcode TARGET_WARM_RESET authorization" | |
87 | " failed for Initiator Node: %s\n", | |
88 | sess->se_sess->se_node_acl->initiatorname); | |
89 | return -1; | |
90 | } | |
91 | /* | |
92 | * Do the real work in transport_generic_do_tmr(). | |
93 | */ | |
94 | return 0; | |
95 | } | |
96 | ||
97 | int iscsit_tmr_task_cold_reset( | |
98 | struct iscsi_conn *conn, | |
99 | struct iscsi_tmr_req *tmr_req, | |
100 | unsigned char *buf) | |
101 | { | |
102 | struct iscsi_session *sess = conn->sess; | |
103 | struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); | |
104 | ||
105 | if (!na->tmr_cold_reset) { | |
106 | pr_err("TMR Opcode TARGET_COLD_RESET authorization" | |
107 | " failed for Initiator Node: %s\n", | |
108 | sess->se_sess->se_node_acl->initiatorname); | |
109 | return -1; | |
110 | } | |
111 | /* | |
112 | * Do the real work in transport_generic_do_tmr(). | |
113 | */ | |
114 | return 0; | |
115 | } | |
116 | ||
117 | u8 iscsit_tmr_task_reassign( | |
118 | struct iscsi_cmd *cmd, | |
119 | unsigned char *buf) | |
120 | { | |
121 | struct iscsi_cmd *ref_cmd = NULL; | |
122 | struct iscsi_conn *conn = cmd->conn; | |
123 | struct iscsi_conn_recovery *cr = NULL; | |
124 | struct iscsi_tmr_req *tmr_req = cmd->tmr_req; | |
125 | struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; | |
126 | struct iscsi_tm *hdr = (struct iscsi_tm *) buf; | |
127 | int ret; | |
128 | ||
129 | pr_debug("Got TASK_REASSIGN TMR ITT: 0x%08x," | |
130 | " RefTaskTag: 0x%08x, ExpDataSN: 0x%08x, CID: %hu\n", | |
131 | hdr->itt, hdr->rtt, hdr->exp_datasn, conn->cid); | |
132 | ||
133 | if (conn->sess->sess_ops->ErrorRecoveryLevel != 2) { | |
134 | pr_err("TMR TASK_REASSIGN not supported in ERL<2," | |
135 | " ignoring request.\n"); | |
136 | return ISCSI_TMF_RSP_NOT_SUPPORTED; | |
137 | } | |
138 | ||
139 | ret = iscsit_find_cmd_for_recovery(conn->sess, &ref_cmd, &cr, hdr->rtt); | |
140 | if (ret == -2) { | |
141 | pr_err("Command ITT: 0x%08x is still alligent to CID:" | |
142 | " %hu\n", ref_cmd->init_task_tag, cr->cid); | |
143 | return ISCSI_TMF_RSP_TASK_ALLEGIANT; | |
144 | } else if (ret == -1) { | |
145 | pr_err("Unable to locate RefTaskTag: 0x%08x in" | |
146 | " connection recovery command list.\n", hdr->rtt); | |
147 | return ISCSI_TMF_RSP_NO_TASK; | |
148 | } | |
149 | /* | |
150 | * Temporary check to prevent connection recovery for | |
151 | * connections with a differing MaxRecvDataSegmentLength. | |
152 | */ | |
153 | if (cr->maxrecvdatasegmentlength != | |
154 | conn->conn_ops->MaxRecvDataSegmentLength) { | |
155 | pr_err("Unable to perform connection recovery for" | |
156 | " differing MaxRecvDataSegmentLength, rejecting" | |
157 | " TMR TASK_REASSIGN.\n"); | |
158 | return ISCSI_TMF_RSP_REJECTED; | |
159 | } | |
160 | ||
161 | se_tmr->ref_task_tag = hdr->rtt; | |
162 | se_tmr->ref_cmd = &ref_cmd->se_cmd; | |
163 | se_tmr->ref_task_lun = get_unaligned_le64(&hdr->lun); | |
164 | tmr_req->ref_cmd_sn = hdr->refcmdsn; | |
165 | tmr_req->exp_data_sn = hdr->exp_datasn; | |
166 | tmr_req->conn_recovery = cr; | |
167 | tmr_req->task_reassign = 1; | |
168 | /* | |
169 | * Command can now be reassigned to a new connection. | |
170 | * The task management response must be sent before the | |
171 | * reassignment actually happens. See iscsi_tmr_post_handler(). | |
172 | */ | |
173 | return ISCSI_TMF_RSP_COMPLETE; | |
174 | } | |
175 | ||
176 | static void iscsit_task_reassign_remove_cmd( | |
177 | struct iscsi_cmd *cmd, | |
178 | struct iscsi_conn_recovery *cr, | |
179 | struct iscsi_session *sess) | |
180 | { | |
181 | int ret; | |
182 | ||
183 | spin_lock(&cr->conn_recovery_cmd_lock); | |
184 | ret = iscsit_remove_cmd_from_connection_recovery(cmd, sess); | |
185 | spin_unlock(&cr->conn_recovery_cmd_lock); | |
186 | if (!ret) { | |
187 | pr_debug("iSCSI connection recovery successful for CID:" | |
188 | " %hu on SID: %u\n", cr->cid, sess->sid); | |
189 | iscsit_remove_active_connection_recovery_entry(cr, sess); | |
190 | } | |
191 | } | |
192 | ||
193 | static int iscsit_task_reassign_complete_nop_out( | |
194 | struct iscsi_tmr_req *tmr_req, | |
195 | struct iscsi_conn *conn) | |
196 | { | |
197 | struct se_tmr_req *se_tmr = tmr_req->se_tmr_req; | |
198 | struct se_cmd *se_cmd = se_tmr->ref_cmd; | |
199 | struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd); | |
200 | struct iscsi_conn_recovery *cr; | |
201 | ||
202 | if (!cmd->cr) { | |
203 | pr_err("struct iscsi_conn_recovery pointer for ITT: 0x%08x" | |
204 | " is NULL!\n", cmd->init_task_tag); | |
205 | return -1; | |
206 | } | |
207 | cr = cmd->cr; | |
208 | ||
209 | /* | |
210 | * Reset the StatSN so a new one for this commands new connection | |
211 | * will be assigned. | |
212 | * Reset the ExpStatSN as well so we may receive Status SNACKs. | |
213 | */ | |
214 | cmd->stat_sn = cmd->exp_stat_sn = 0; | |
215 | ||
216 | iscsit_task_reassign_remove_cmd(cmd, cr, conn->sess); | |
217 | ||
218 | spin_lock_bh(&conn->cmd_lock); | |
219 | list_add_tail(&cmd->i_list, &conn->conn_cmd_list); | |
220 | spin_unlock_bh(&conn->cmd_lock); | |
221 | ||
222 | cmd->i_state = ISTATE_SEND_NOPIN; | |
223 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
224 | return 0; | |
225 | } | |
226 | ||
227 | static int iscsit_task_reassign_complete_write( | |
228 | struct iscsi_cmd *cmd, | |
229 | struct iscsi_tmr_req *tmr_req) | |
230 | { | |
231 | int no_build_r2ts = 0; | |
232 | u32 length = 0, offset = 0; | |
233 | struct iscsi_conn *conn = cmd->conn; | |
234 | struct se_cmd *se_cmd = &cmd->se_cmd; | |
235 | /* | |
236 | * The Initiator must not send a R2T SNACK with a Begrun less than | |
237 | * the TMR TASK_REASSIGN's ExpDataSN. | |
238 | */ | |
239 | if (!tmr_req->exp_data_sn) { | |
240 | cmd->cmd_flags &= ~ICF_GOT_DATACK_SNACK; | |
241 | cmd->acked_data_sn = 0; | |
242 | } else { | |
243 | cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; | |
244 | cmd->acked_data_sn = (tmr_req->exp_data_sn - 1); | |
245 | } | |
246 | ||
247 | /* | |
248 | * The TMR TASK_REASSIGN's ExpDataSN contains the next R2TSN the | |
249 | * Initiator is expecting. The Target controls all WRITE operations | |
250 | * so if we have received all DataOUT we can safety ignore Initiator. | |
251 | */ | |
252 | if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { | |
415a090a | 253 | if (!atomic_read(&cmd->se_cmd.t_transport_sent)) { |
e48354ce NB |
254 | pr_debug("WRITE ITT: 0x%08x: t_state: %d" |
255 | " never sent to transport\n", | |
256 | cmd->init_task_tag, cmd->se_cmd.t_state); | |
257 | return transport_generic_handle_data(se_cmd); | |
258 | } | |
259 | ||
260 | cmd->i_state = ISTATE_SEND_STATUS; | |
261 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
262 | return 0; | |
263 | } | |
264 | ||
265 | /* | |
266 | * Special case to deal with DataSequenceInOrder=No and Non-Immeidate | |
267 | * Unsolicited DataOut. | |
268 | */ | |
269 | if (cmd->unsolicited_data) { | |
270 | cmd->unsolicited_data = 0; | |
271 | ||
272 | offset = cmd->next_burst_len = cmd->write_data_done; | |
273 | ||
274 | if ((conn->sess->sess_ops->FirstBurstLength - offset) >= | |
275 | cmd->data_length) { | |
276 | no_build_r2ts = 1; | |
277 | length = (cmd->data_length - offset); | |
278 | } else | |
279 | length = (conn->sess->sess_ops->FirstBurstLength - offset); | |
280 | ||
281 | spin_lock_bh(&cmd->r2t_lock); | |
282 | if (iscsit_add_r2t_to_list(cmd, offset, length, 0, 0) < 0) { | |
283 | spin_unlock_bh(&cmd->r2t_lock); | |
284 | return -1; | |
285 | } | |
286 | cmd->outstanding_r2ts++; | |
287 | spin_unlock_bh(&cmd->r2t_lock); | |
288 | ||
289 | if (no_build_r2ts) | |
290 | return 0; | |
291 | } | |
292 | /* | |
293 | * iscsit_build_r2ts_for_cmd() can handle the rest from here. | |
294 | */ | |
295 | return iscsit_build_r2ts_for_cmd(cmd, conn, 2); | |
296 | } | |
297 | ||
298 | static int iscsit_task_reassign_complete_read( | |
299 | struct iscsi_cmd *cmd, | |
300 | struct iscsi_tmr_req *tmr_req) | |
301 | { | |
302 | struct iscsi_conn *conn = cmd->conn; | |
303 | struct iscsi_datain_req *dr; | |
304 | struct se_cmd *se_cmd = &cmd->se_cmd; | |
305 | /* | |
306 | * The Initiator must not send a Data SNACK with a BegRun less than | |
307 | * the TMR TASK_REASSIGN's ExpDataSN. | |
308 | */ | |
309 | if (!tmr_req->exp_data_sn) { | |
310 | cmd->cmd_flags &= ~ICF_GOT_DATACK_SNACK; | |
311 | cmd->acked_data_sn = 0; | |
312 | } else { | |
313 | cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; | |
314 | cmd->acked_data_sn = (tmr_req->exp_data_sn - 1); | |
315 | } | |
316 | ||
415a090a | 317 | if (!atomic_read(&cmd->se_cmd.t_transport_sent)) { |
e48354ce NB |
318 | pr_debug("READ ITT: 0x%08x: t_state: %d never sent to" |
319 | " transport\n", cmd->init_task_tag, | |
320 | cmd->se_cmd.t_state); | |
acf3ecc4 | 321 | transport_handle_cdb_direct(se_cmd); |
e48354ce NB |
322 | return 0; |
323 | } | |
324 | ||
325 | if (!atomic_read(&se_cmd->t_transport_complete)) { | |
326 | pr_err("READ ITT: 0x%08x: t_state: %d, never returned" | |
327 | " from transport\n", cmd->init_task_tag, | |
328 | cmd->se_cmd.t_state); | |
329 | return -1; | |
330 | } | |
331 | ||
332 | dr = iscsit_allocate_datain_req(); | |
333 | if (!dr) | |
334 | return -1; | |
335 | /* | |
336 | * The TMR TASK_REASSIGN's ExpDataSN contains the next DataSN the | |
337 | * Initiator is expecting. | |
338 | */ | |
339 | dr->data_sn = dr->begrun = tmr_req->exp_data_sn; | |
340 | dr->runlength = 0; | |
341 | dr->generate_recovery_values = 1; | |
342 | dr->recovery = DATAIN_CONNECTION_RECOVERY; | |
343 | ||
344 | iscsit_attach_datain_req(cmd, dr); | |
345 | ||
346 | cmd->i_state = ISTATE_SEND_DATAIN; | |
347 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
348 | return 0; | |
349 | } | |
350 | ||
351 | static int iscsit_task_reassign_complete_none( | |
352 | struct iscsi_cmd *cmd, | |
353 | struct iscsi_tmr_req *tmr_req) | |
354 | { | |
355 | struct iscsi_conn *conn = cmd->conn; | |
356 | ||
357 | cmd->i_state = ISTATE_SEND_STATUS; | |
358 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
359 | return 0; | |
360 | } | |
361 | ||
362 | static int iscsit_task_reassign_complete_scsi_cmnd( | |
363 | struct iscsi_tmr_req *tmr_req, | |
364 | struct iscsi_conn *conn) | |
365 | { | |
366 | struct se_tmr_req *se_tmr = tmr_req->se_tmr_req; | |
367 | struct se_cmd *se_cmd = se_tmr->ref_cmd; | |
368 | struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd); | |
369 | struct iscsi_conn_recovery *cr; | |
370 | ||
371 | if (!cmd->cr) { | |
372 | pr_err("struct iscsi_conn_recovery pointer for ITT: 0x%08x" | |
373 | " is NULL!\n", cmd->init_task_tag); | |
374 | return -1; | |
375 | } | |
376 | cr = cmd->cr; | |
377 | ||
378 | /* | |
379 | * Reset the StatSN so a new one for this commands new connection | |
380 | * will be assigned. | |
381 | * Reset the ExpStatSN as well so we may receive Status SNACKs. | |
382 | */ | |
383 | cmd->stat_sn = cmd->exp_stat_sn = 0; | |
384 | ||
385 | iscsit_task_reassign_remove_cmd(cmd, cr, conn->sess); | |
386 | ||
387 | spin_lock_bh(&conn->cmd_lock); | |
388 | list_add_tail(&cmd->i_list, &conn->conn_cmd_list); | |
389 | spin_unlock_bh(&conn->cmd_lock); | |
390 | ||
391 | if (se_cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { | |
392 | cmd->i_state = ISTATE_SEND_STATUS; | |
393 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
394 | return 0; | |
395 | } | |
396 | ||
397 | switch (cmd->data_direction) { | |
398 | case DMA_TO_DEVICE: | |
399 | return iscsit_task_reassign_complete_write(cmd, tmr_req); | |
400 | case DMA_FROM_DEVICE: | |
401 | return iscsit_task_reassign_complete_read(cmd, tmr_req); | |
402 | case DMA_NONE: | |
403 | return iscsit_task_reassign_complete_none(cmd, tmr_req); | |
404 | default: | |
405 | pr_err("Unknown cmd->data_direction: 0x%02x\n", | |
406 | cmd->data_direction); | |
407 | return -1; | |
408 | } | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
413 | static int iscsit_task_reassign_complete( | |
414 | struct iscsi_tmr_req *tmr_req, | |
415 | struct iscsi_conn *conn) | |
416 | { | |
417 | struct se_tmr_req *se_tmr = tmr_req->se_tmr_req; | |
418 | struct se_cmd *se_cmd; | |
419 | struct iscsi_cmd *cmd; | |
420 | int ret = 0; | |
421 | ||
422 | if (!se_tmr->ref_cmd) { | |
423 | pr_err("TMR Request is missing a RefCmd struct iscsi_cmd.\n"); | |
424 | return -1; | |
425 | } | |
426 | se_cmd = se_tmr->ref_cmd; | |
427 | cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd); | |
428 | ||
429 | cmd->conn = conn; | |
430 | ||
431 | switch (cmd->iscsi_opcode) { | |
432 | case ISCSI_OP_NOOP_OUT: | |
433 | ret = iscsit_task_reassign_complete_nop_out(tmr_req, conn); | |
434 | break; | |
435 | case ISCSI_OP_SCSI_CMD: | |
436 | ret = iscsit_task_reassign_complete_scsi_cmnd(tmr_req, conn); | |
437 | break; | |
438 | default: | |
439 | pr_err("Illegal iSCSI Opcode 0x%02x during" | |
440 | " command realligence\n", cmd->iscsi_opcode); | |
441 | return -1; | |
442 | } | |
443 | ||
444 | if (ret != 0) | |
445 | return ret; | |
446 | ||
447 | pr_debug("Completed connection realligence for Opcode: 0x%02x," | |
448 | " ITT: 0x%08x to CID: %hu.\n", cmd->iscsi_opcode, | |
449 | cmd->init_task_tag, conn->cid); | |
450 | ||
451 | return 0; | |
452 | } | |
453 | ||
454 | /* | |
455 | * Handles special after-the-fact actions related to TMRs. | |
456 | * Right now the only one that its really needed for is | |
457 | * connection recovery releated TASK_REASSIGN. | |
458 | */ | |
459 | extern int iscsit_tmr_post_handler(struct iscsi_cmd *cmd, struct iscsi_conn *conn) | |
460 | { | |
461 | struct iscsi_tmr_req *tmr_req = cmd->tmr_req; | |
462 | struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; | |
463 | ||
464 | if (tmr_req->task_reassign && | |
465 | (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) | |
466 | return iscsit_task_reassign_complete(tmr_req, conn); | |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
471 | /* | |
472 | * Nothing to do here, but leave it for good measure. :-) | |
473 | */ | |
474 | int iscsit_task_reassign_prepare_read( | |
475 | struct iscsi_tmr_req *tmr_req, | |
476 | struct iscsi_conn *conn) | |
477 | { | |
478 | return 0; | |
479 | } | |
480 | ||
481 | static void iscsit_task_reassign_prepare_unsolicited_dataout( | |
482 | struct iscsi_cmd *cmd, | |
483 | struct iscsi_conn *conn) | |
484 | { | |
485 | int i, j; | |
486 | struct iscsi_pdu *pdu = NULL; | |
487 | struct iscsi_seq *seq = NULL; | |
488 | ||
489 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
490 | cmd->data_sn = 0; | |
491 | ||
492 | if (cmd->immediate_data) | |
493 | cmd->r2t_offset += (cmd->first_burst_len - | |
494 | cmd->seq_start_offset); | |
495 | ||
496 | if (conn->sess->sess_ops->DataPDUInOrder) { | |
497 | cmd->write_data_done -= (cmd->immediate_data) ? | |
498 | (cmd->first_burst_len - | |
499 | cmd->seq_start_offset) : | |
500 | cmd->first_burst_len; | |
501 | cmd->first_burst_len = 0; | |
502 | return; | |
503 | } | |
504 | ||
505 | for (i = 0; i < cmd->pdu_count; i++) { | |
506 | pdu = &cmd->pdu_list[i]; | |
507 | ||
508 | if (pdu->status != ISCSI_PDU_RECEIVED_OK) | |
509 | continue; | |
510 | ||
511 | if ((pdu->offset >= cmd->seq_start_offset) && | |
512 | ((pdu->offset + pdu->length) <= | |
513 | cmd->seq_end_offset)) { | |
514 | cmd->first_burst_len -= pdu->length; | |
515 | cmd->write_data_done -= pdu->length; | |
516 | pdu->status = ISCSI_PDU_NOT_RECEIVED; | |
517 | } | |
518 | } | |
519 | } else { | |
520 | for (i = 0; i < cmd->seq_count; i++) { | |
521 | seq = &cmd->seq_list[i]; | |
522 | ||
523 | if (seq->type != SEQTYPE_UNSOLICITED) | |
524 | continue; | |
525 | ||
526 | cmd->write_data_done -= | |
527 | (seq->offset - seq->orig_offset); | |
528 | cmd->first_burst_len = 0; | |
529 | seq->data_sn = 0; | |
530 | seq->offset = seq->orig_offset; | |
531 | seq->next_burst_len = 0; | |
532 | seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; | |
533 | ||
534 | if (conn->sess->sess_ops->DataPDUInOrder) | |
535 | continue; | |
536 | ||
537 | for (j = 0; j < seq->pdu_count; j++) { | |
538 | pdu = &cmd->pdu_list[j+seq->pdu_start]; | |
539 | ||
540 | if (pdu->status != ISCSI_PDU_RECEIVED_OK) | |
541 | continue; | |
542 | ||
543 | pdu->status = ISCSI_PDU_NOT_RECEIVED; | |
544 | } | |
545 | } | |
546 | } | |
547 | } | |
548 | ||
549 | int iscsit_task_reassign_prepare_write( | |
550 | struct iscsi_tmr_req *tmr_req, | |
551 | struct iscsi_conn *conn) | |
552 | { | |
553 | struct se_tmr_req *se_tmr = tmr_req->se_tmr_req; | |
554 | struct se_cmd *se_cmd = se_tmr->ref_cmd; | |
555 | struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd); | |
556 | struct iscsi_pdu *pdu = NULL; | |
557 | struct iscsi_r2t *r2t = NULL, *r2t_tmp; | |
558 | int first_incomplete_r2t = 1, i = 0; | |
559 | ||
560 | /* | |
561 | * The command was in the process of receiving Unsolicited DataOUT when | |
562 | * the connection failed. | |
563 | */ | |
564 | if (cmd->unsolicited_data) | |
565 | iscsit_task_reassign_prepare_unsolicited_dataout(cmd, conn); | |
566 | ||
567 | /* | |
568 | * The Initiator is requesting R2Ts starting from zero, skip | |
569 | * checking acknowledged R2Ts and start checking struct iscsi_r2ts | |
570 | * greater than zero. | |
571 | */ | |
572 | if (!tmr_req->exp_data_sn) | |
573 | goto drop_unacknowledged_r2ts; | |
574 | ||
575 | /* | |
576 | * We now check that the PDUs in DataOUT sequences below | |
577 | * the TMR TASK_REASSIGN ExpDataSN (R2TSN the Initiator is | |
578 | * expecting next) have all the DataOUT they require to complete | |
579 | * the DataOUT sequence. First scan from R2TSN 0 to TMR | |
580 | * TASK_REASSIGN ExpDataSN-1. | |
581 | * | |
582 | * If we have not received all DataOUT in question, we must | |
583 | * make sure to make the appropriate changes to values in | |
584 | * struct iscsi_cmd (and elsewhere depending on session parameters) | |
585 | * so iscsit_build_r2ts_for_cmd() in iscsit_task_reassign_complete_write() | |
586 | * will resend a new R2T for the DataOUT sequences in question. | |
587 | */ | |
588 | spin_lock_bh(&cmd->r2t_lock); | |
589 | if (list_empty(&cmd->cmd_r2t_list)) { | |
590 | spin_unlock_bh(&cmd->r2t_lock); | |
591 | return -1; | |
592 | } | |
593 | ||
594 | list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { | |
595 | ||
596 | if (r2t->r2t_sn >= tmr_req->exp_data_sn) | |
597 | continue; | |
598 | /* | |
599 | * Safely ignore Recovery R2Ts and R2Ts that have completed | |
600 | * DataOUT sequences. | |
601 | */ | |
602 | if (r2t->seq_complete) | |
603 | continue; | |
604 | ||
605 | if (r2t->recovery_r2t) | |
606 | continue; | |
607 | ||
608 | /* | |
609 | * DataSequenceInOrder=Yes: | |
610 | * | |
611 | * Taking into account the iSCSI implementation requirement of | |
612 | * MaxOutstandingR2T=1 while ErrorRecoveryLevel>0 and | |
613 | * DataSequenceInOrder=Yes, we must take into consideration | |
614 | * the following: | |
615 | * | |
616 | * DataSequenceInOrder=No: | |
617 | * | |
618 | * Taking into account that the Initiator controls the (possibly | |
619 | * random) PDU Order in (possibly random) Sequence Order of | |
620 | * DataOUT the target requests with R2Ts, we must take into | |
621 | * consideration the following: | |
622 | * | |
623 | * DataPDUInOrder=Yes for DataSequenceInOrder=[Yes,No]: | |
624 | * | |
625 | * While processing non-complete R2T DataOUT sequence requests | |
626 | * the Target will re-request only the total sequence length | |
627 | * minus current received offset. This is because we must | |
628 | * assume the initiator will continue sending DataOUT from the | |
629 | * last PDU before the connection failed. | |
630 | * | |
631 | * DataPDUInOrder=No for DataSequenceInOrder=[Yes,No]: | |
632 | * | |
633 | * While processing non-complete R2T DataOUT sequence requests | |
634 | * the Target will re-request the entire DataOUT sequence if | |
635 | * any single PDU is missing from the sequence. This is because | |
636 | * we have no logical method to determine the next PDU offset, | |
637 | * and we must assume the Initiator will be sending any random | |
638 | * PDU offset in the current sequence after TASK_REASSIGN | |
639 | * has completed. | |
640 | */ | |
641 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
642 | if (!first_incomplete_r2t) { | |
643 | cmd->r2t_offset -= r2t->xfer_len; | |
644 | goto next; | |
645 | } | |
646 | ||
647 | if (conn->sess->sess_ops->DataPDUInOrder) { | |
648 | cmd->data_sn = 0; | |
649 | cmd->r2t_offset -= (r2t->xfer_len - | |
650 | cmd->next_burst_len); | |
651 | first_incomplete_r2t = 0; | |
652 | goto next; | |
653 | } | |
654 | ||
655 | cmd->data_sn = 0; | |
656 | cmd->r2t_offset -= r2t->xfer_len; | |
657 | ||
658 | for (i = 0; i < cmd->pdu_count; i++) { | |
659 | pdu = &cmd->pdu_list[i]; | |
660 | ||
661 | if (pdu->status != ISCSI_PDU_RECEIVED_OK) | |
662 | continue; | |
663 | ||
664 | if ((pdu->offset >= r2t->offset) && | |
665 | (pdu->offset < (r2t->offset + | |
666 | r2t->xfer_len))) { | |
667 | cmd->next_burst_len -= pdu->length; | |
668 | cmd->write_data_done -= pdu->length; | |
669 | pdu->status = ISCSI_PDU_NOT_RECEIVED; | |
670 | } | |
671 | } | |
672 | ||
673 | first_incomplete_r2t = 0; | |
674 | } else { | |
675 | struct iscsi_seq *seq; | |
676 | ||
677 | seq = iscsit_get_seq_holder(cmd, r2t->offset, | |
678 | r2t->xfer_len); | |
679 | if (!seq) { | |
680 | spin_unlock_bh(&cmd->r2t_lock); | |
681 | return -1; | |
682 | } | |
683 | ||
684 | cmd->write_data_done -= | |
685 | (seq->offset - seq->orig_offset); | |
686 | seq->data_sn = 0; | |
687 | seq->offset = seq->orig_offset; | |
688 | seq->next_burst_len = 0; | |
689 | seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; | |
690 | ||
691 | cmd->seq_send_order--; | |
692 | ||
693 | if (conn->sess->sess_ops->DataPDUInOrder) | |
694 | goto next; | |
695 | ||
696 | for (i = 0; i < seq->pdu_count; i++) { | |
697 | pdu = &cmd->pdu_list[i+seq->pdu_start]; | |
698 | ||
699 | if (pdu->status != ISCSI_PDU_RECEIVED_OK) | |
700 | continue; | |
701 | ||
702 | pdu->status = ISCSI_PDU_NOT_RECEIVED; | |
703 | } | |
704 | } | |
705 | ||
706 | next: | |
707 | cmd->outstanding_r2ts--; | |
708 | } | |
709 | spin_unlock_bh(&cmd->r2t_lock); | |
710 | ||
711 | /* | |
712 | * We now drop all unacknowledged R2Ts, ie: ExpDataSN from TMR | |
713 | * TASK_REASSIGN to the last R2T in the list.. We are also careful | |
714 | * to check that the Initiator is not requesting R2Ts for DataOUT | |
715 | * sequences it has already completed. | |
716 | * | |
717 | * Free each R2T in question and adjust values in struct iscsi_cmd | |
718 | * accordingly so iscsit_build_r2ts_for_cmd() do the rest of | |
719 | * the work after the TMR TASK_REASSIGN Response is sent. | |
720 | */ | |
721 | drop_unacknowledged_r2ts: | |
722 | ||
723 | cmd->cmd_flags &= ~ICF_SENT_LAST_R2T; | |
724 | cmd->r2t_sn = tmr_req->exp_data_sn; | |
725 | ||
726 | spin_lock_bh(&cmd->r2t_lock); | |
727 | list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list) { | |
728 | /* | |
729 | * Skip up to the R2T Sequence number provided by the | |
730 | * iSCSI TASK_REASSIGN TMR | |
731 | */ | |
732 | if (r2t->r2t_sn < tmr_req->exp_data_sn) | |
733 | continue; | |
734 | ||
735 | if (r2t->seq_complete) { | |
736 | pr_err("Initiator is requesting R2Ts from" | |
737 | " R2TSN: 0x%08x, but R2TSN: 0x%08x, Offset: %u," | |
738 | " Length: %u is already complete." | |
739 | " BAD INITIATOR ERL=2 IMPLEMENTATION!\n", | |
740 | tmr_req->exp_data_sn, r2t->r2t_sn, | |
741 | r2t->offset, r2t->xfer_len); | |
742 | spin_unlock_bh(&cmd->r2t_lock); | |
743 | return -1; | |
744 | } | |
745 | ||
746 | if (r2t->recovery_r2t) { | |
747 | iscsit_free_r2t(r2t, cmd); | |
748 | continue; | |
749 | } | |
750 | ||
751 | /* DataSequenceInOrder=Yes: | |
752 | * | |
753 | * Taking into account the iSCSI implementation requirement of | |
754 | * MaxOutstandingR2T=1 while ErrorRecoveryLevel>0 and | |
755 | * DataSequenceInOrder=Yes, it's safe to subtract the R2Ts | |
756 | * entire transfer length from the commands R2T offset marker. | |
757 | * | |
758 | * DataSequenceInOrder=No: | |
759 | * | |
760 | * We subtract the difference from struct iscsi_seq between the | |
761 | * current offset and original offset from cmd->write_data_done | |
762 | * for account for DataOUT PDUs already received. Then reset | |
763 | * the current offset to the original and zero out the current | |
764 | * burst length, to make sure we re-request the entire DataOUT | |
765 | * sequence. | |
766 | */ | |
767 | if (conn->sess->sess_ops->DataSequenceInOrder) | |
768 | cmd->r2t_offset -= r2t->xfer_len; | |
769 | else | |
770 | cmd->seq_send_order--; | |
771 | ||
772 | cmd->outstanding_r2ts--; | |
773 | iscsit_free_r2t(r2t, cmd); | |
774 | } | |
775 | spin_unlock_bh(&cmd->r2t_lock); | |
776 | ||
777 | return 0; | |
778 | } | |
779 | ||
780 | /* | |
781 | * Performs sanity checks TMR TASK_REASSIGN's ExpDataSN for | |
782 | * a given struct iscsi_cmd. | |
783 | */ | |
784 | int iscsit_check_task_reassign_expdatasn( | |
785 | struct iscsi_tmr_req *tmr_req, | |
786 | struct iscsi_conn *conn) | |
787 | { | |
788 | struct se_tmr_req *se_tmr = tmr_req->se_tmr_req; | |
789 | struct se_cmd *se_cmd = se_tmr->ref_cmd; | |
790 | struct iscsi_cmd *ref_cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd); | |
791 | ||
792 | if (ref_cmd->iscsi_opcode != ISCSI_OP_SCSI_CMD) | |
793 | return 0; | |
794 | ||
795 | if (se_cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) | |
796 | return 0; | |
797 | ||
798 | if (ref_cmd->data_direction == DMA_NONE) | |
799 | return 0; | |
800 | ||
801 | /* | |
802 | * For READs the TMR TASK_REASSIGNs ExpDataSN contains the next DataSN | |
803 | * of DataIN the Initiator is expecting. | |
804 | * | |
805 | * Also check that the Initiator is not re-requesting DataIN that has | |
806 | * already been acknowledged with a DataAck SNACK. | |
807 | */ | |
808 | if (ref_cmd->data_direction == DMA_FROM_DEVICE) { | |
809 | if (tmr_req->exp_data_sn > ref_cmd->data_sn) { | |
810 | pr_err("Received ExpDataSN: 0x%08x for READ" | |
811 | " in TMR TASK_REASSIGN greater than command's" | |
812 | " DataSN: 0x%08x.\n", tmr_req->exp_data_sn, | |
813 | ref_cmd->data_sn); | |
814 | return -1; | |
815 | } | |
816 | if ((ref_cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && | |
817 | (tmr_req->exp_data_sn <= ref_cmd->acked_data_sn)) { | |
818 | pr_err("Received ExpDataSN: 0x%08x for READ" | |
819 | " in TMR TASK_REASSIGN for previously" | |
820 | " acknowledged DataIN: 0x%08x," | |
821 | " protocol error\n", tmr_req->exp_data_sn, | |
822 | ref_cmd->acked_data_sn); | |
823 | return -1; | |
824 | } | |
825 | return iscsit_task_reassign_prepare_read(tmr_req, conn); | |
826 | } | |
827 | ||
828 | /* | |
829 | * For WRITEs the TMR TASK_REASSIGNs ExpDataSN contains the next R2TSN | |
830 | * for R2Ts the Initiator is expecting. | |
831 | * | |
832 | * Do the magic in iscsit_task_reassign_prepare_write(). | |
833 | */ | |
834 | if (ref_cmd->data_direction == DMA_TO_DEVICE) { | |
835 | if (tmr_req->exp_data_sn > ref_cmd->r2t_sn) { | |
836 | pr_err("Received ExpDataSN: 0x%08x for WRITE" | |
837 | " in TMR TASK_REASSIGN greater than command's" | |
838 | " R2TSN: 0x%08x.\n", tmr_req->exp_data_sn, | |
839 | ref_cmd->r2t_sn); | |
840 | return -1; | |
841 | } | |
842 | return iscsit_task_reassign_prepare_write(tmr_req, conn); | |
843 | } | |
844 | ||
845 | pr_err("Unknown iSCSI data_direction: 0x%02x\n", | |
846 | ref_cmd->data_direction); | |
847 | ||
848 | return -1; | |
849 | } |