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> | |
9f3eb93e | 22 | #include <scsi/scsi_device.h> |
e48354ce NB |
23 | #include <scsi/iscsi_proto.h> |
24 | #include <target/target_core_base.h> | |
c4795fb2 | 25 | #include <target/target_core_fabric.h> |
e48354ce NB |
26 | |
27 | #include "iscsi_target_core.h" | |
28 | #include "iscsi_target_seq_pdu_list.h" | |
29 | #include "iscsi_target_datain_values.h" | |
30 | #include "iscsi_target_device.h" | |
31 | #include "iscsi_target_erl0.h" | |
32 | #include "iscsi_target_erl1.h" | |
33 | #include "iscsi_target_erl2.h" | |
34 | #include "iscsi_target_tmr.h" | |
35 | #include "iscsi_target_tpg.h" | |
36 | #include "iscsi_target_util.h" | |
37 | #include "iscsi_target.h" | |
38 | ||
39 | u8 iscsit_tmr_abort_task( | |
40 | struct iscsi_cmd *cmd, | |
41 | unsigned char *buf) | |
42 | { | |
43 | struct iscsi_cmd *ref_cmd; | |
44 | struct iscsi_conn *conn = cmd->conn; | |
45 | struct iscsi_tmr_req *tmr_req = cmd->tmr_req; | |
46 | struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; | |
47 | struct iscsi_tm *hdr = (struct iscsi_tm *) buf; | |
48 | ||
49 | ref_cmd = iscsit_find_cmd_from_itt(conn, hdr->rtt); | |
50 | if (!ref_cmd) { | |
51 | pr_err("Unable to locate RefTaskTag: 0x%08x on CID:" | |
52 | " %hu.\n", hdr->rtt, conn->cid); | |
53 | return ((hdr->refcmdsn >= conn->sess->exp_cmd_sn) && | |
54 | (hdr->refcmdsn <= conn->sess->max_cmd_sn)) ? | |
55 | ISCSI_TMF_RSP_COMPLETE : ISCSI_TMF_RSP_NO_TASK; | |
56 | } | |
57 | if (ref_cmd->cmd_sn != hdr->refcmdsn) { | |
58 | pr_err("RefCmdSN 0x%08x does not equal" | |
59 | " task's CmdSN 0x%08x. Rejecting ABORT_TASK.\n", | |
60 | hdr->refcmdsn, ref_cmd->cmd_sn); | |
61 | return ISCSI_TMF_RSP_REJECTED; | |
62 | } | |
63 | ||
64 | se_tmr->ref_task_tag = hdr->rtt; | |
9f3eb93e | 65 | tmr_req->ref_cmd = ref_cmd; |
e48354ce NB |
66 | tmr_req->ref_cmd_sn = hdr->refcmdsn; |
67 | tmr_req->exp_data_sn = hdr->exp_datasn; | |
68 | ||
69 | return ISCSI_TMF_RSP_COMPLETE; | |
70 | } | |
71 | ||
72 | /* | |
73 | * Called from iscsit_handle_task_mgt_cmd(). | |
74 | */ | |
75 | int iscsit_tmr_task_warm_reset( | |
76 | struct iscsi_conn *conn, | |
77 | struct iscsi_tmr_req *tmr_req, | |
78 | unsigned char *buf) | |
79 | { | |
80 | struct iscsi_session *sess = conn->sess; | |
81 | struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); | |
8b1e1244 | 82 | |
e48354ce NB |
83 | if (!na->tmr_warm_reset) { |
84 | pr_err("TMR Opcode TARGET_WARM_RESET authorization" | |
85 | " failed for Initiator Node: %s\n", | |
86 | sess->se_sess->se_node_acl->initiatorname); | |
87 | return -1; | |
88 | } | |
89 | /* | |
90 | * Do the real work in transport_generic_do_tmr(). | |
91 | */ | |
92 | return 0; | |
93 | } | |
94 | ||
95 | int iscsit_tmr_task_cold_reset( | |
96 | struct iscsi_conn *conn, | |
97 | struct iscsi_tmr_req *tmr_req, | |
98 | unsigned char *buf) | |
99 | { | |
100 | struct iscsi_session *sess = conn->sess; | |
101 | struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); | |
102 | ||
103 | if (!na->tmr_cold_reset) { | |
104 | pr_err("TMR Opcode TARGET_COLD_RESET authorization" | |
105 | " failed for Initiator Node: %s\n", | |
106 | sess->se_sess->se_node_acl->initiatorname); | |
107 | return -1; | |
108 | } | |
109 | /* | |
110 | * Do the real work in transport_generic_do_tmr(). | |
111 | */ | |
112 | return 0; | |
113 | } | |
114 | ||
115 | u8 iscsit_tmr_task_reassign( | |
116 | struct iscsi_cmd *cmd, | |
117 | unsigned char *buf) | |
118 | { | |
119 | struct iscsi_cmd *ref_cmd = NULL; | |
120 | struct iscsi_conn *conn = cmd->conn; | |
121 | struct iscsi_conn_recovery *cr = NULL; | |
122 | struct iscsi_tmr_req *tmr_req = cmd->tmr_req; | |
123 | struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; | |
124 | struct iscsi_tm *hdr = (struct iscsi_tm *) buf; | |
9f3eb93e | 125 | int ret, ref_lun; |
e48354ce NB |
126 | |
127 | pr_debug("Got TASK_REASSIGN TMR ITT: 0x%08x," | |
128 | " RefTaskTag: 0x%08x, ExpDataSN: 0x%08x, CID: %hu\n", | |
129 | hdr->itt, hdr->rtt, hdr->exp_datasn, conn->cid); | |
130 | ||
131 | if (conn->sess->sess_ops->ErrorRecoveryLevel != 2) { | |
132 | pr_err("TMR TASK_REASSIGN not supported in ERL<2," | |
133 | " ignoring request.\n"); | |
134 | return ISCSI_TMF_RSP_NOT_SUPPORTED; | |
135 | } | |
136 | ||
137 | ret = iscsit_find_cmd_for_recovery(conn->sess, &ref_cmd, &cr, hdr->rtt); | |
138 | if (ret == -2) { | |
139 | pr_err("Command ITT: 0x%08x is still alligent to CID:" | |
140 | " %hu\n", ref_cmd->init_task_tag, cr->cid); | |
141 | return ISCSI_TMF_RSP_TASK_ALLEGIANT; | |
142 | } else if (ret == -1) { | |
143 | pr_err("Unable to locate RefTaskTag: 0x%08x in" | |
144 | " connection recovery command list.\n", hdr->rtt); | |
145 | return ISCSI_TMF_RSP_NO_TASK; | |
146 | } | |
147 | /* | |
148 | * Temporary check to prevent connection recovery for | |
149 | * connections with a differing MaxRecvDataSegmentLength. | |
150 | */ | |
151 | if (cr->maxrecvdatasegmentlength != | |
152 | conn->conn_ops->MaxRecvDataSegmentLength) { | |
153 | pr_err("Unable to perform connection recovery for" | |
154 | " differing MaxRecvDataSegmentLength, rejecting" | |
155 | " TMR TASK_REASSIGN.\n"); | |
156 | return ISCSI_TMF_RSP_REJECTED; | |
157 | } | |
158 | ||
9f3eb93e CH |
159 | ref_lun = scsilun_to_int(&hdr->lun); |
160 | if (ref_lun != ref_cmd->se_cmd.orig_fe_lun) { | |
161 | pr_err("Unable to perform connection recovery for" | |
162 | " differing ref_lun: %d ref_cmd orig_fe_lun: %u\n", | |
163 | ref_lun, ref_cmd->se_cmd.orig_fe_lun); | |
164 | return ISCSI_TMF_RSP_REJECTED; | |
165 | } | |
166 | ||
e48354ce | 167 | se_tmr->ref_task_tag = hdr->rtt; |
9f3eb93e | 168 | tmr_req->ref_cmd = ref_cmd; |
e48354ce NB |
169 | tmr_req->ref_cmd_sn = hdr->refcmdsn; |
170 | tmr_req->exp_data_sn = hdr->exp_datasn; | |
171 | tmr_req->conn_recovery = cr; | |
172 | tmr_req->task_reassign = 1; | |
173 | /* | |
174 | * Command can now be reassigned to a new connection. | |
175 | * The task management response must be sent before the | |
176 | * reassignment actually happens. See iscsi_tmr_post_handler(). | |
177 | */ | |
178 | return ISCSI_TMF_RSP_COMPLETE; | |
179 | } | |
180 | ||
181 | static void iscsit_task_reassign_remove_cmd( | |
182 | struct iscsi_cmd *cmd, | |
183 | struct iscsi_conn_recovery *cr, | |
184 | struct iscsi_session *sess) | |
185 | { | |
186 | int ret; | |
187 | ||
188 | spin_lock(&cr->conn_recovery_cmd_lock); | |
189 | ret = iscsit_remove_cmd_from_connection_recovery(cmd, sess); | |
190 | spin_unlock(&cr->conn_recovery_cmd_lock); | |
191 | if (!ret) { | |
192 | pr_debug("iSCSI connection recovery successful for CID:" | |
193 | " %hu on SID: %u\n", cr->cid, sess->sid); | |
194 | iscsit_remove_active_connection_recovery_entry(cr, sess); | |
195 | } | |
196 | } | |
197 | ||
198 | static int iscsit_task_reassign_complete_nop_out( | |
199 | struct iscsi_tmr_req *tmr_req, | |
200 | struct iscsi_conn *conn) | |
201 | { | |
9f3eb93e | 202 | struct iscsi_cmd *cmd = tmr_req->ref_cmd; |
e48354ce NB |
203 | struct iscsi_conn_recovery *cr; |
204 | ||
205 | if (!cmd->cr) { | |
206 | pr_err("struct iscsi_conn_recovery pointer for ITT: 0x%08x" | |
207 | " is NULL!\n", cmd->init_task_tag); | |
208 | return -1; | |
209 | } | |
210 | cr = cmd->cr; | |
211 | ||
212 | /* | |
213 | * Reset the StatSN so a new one for this commands new connection | |
214 | * will be assigned. | |
215 | * Reset the ExpStatSN as well so we may receive Status SNACKs. | |
216 | */ | |
217 | cmd->stat_sn = cmd->exp_stat_sn = 0; | |
218 | ||
219 | iscsit_task_reassign_remove_cmd(cmd, cr, conn->sess); | |
220 | ||
221 | spin_lock_bh(&conn->cmd_lock); | |
2fbb471e | 222 | list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); |
e48354ce NB |
223 | spin_unlock_bh(&conn->cmd_lock); |
224 | ||
225 | cmd->i_state = ISTATE_SEND_NOPIN; | |
226 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
227 | return 0; | |
228 | } | |
229 | ||
230 | static int iscsit_task_reassign_complete_write( | |
231 | struct iscsi_cmd *cmd, | |
232 | struct iscsi_tmr_req *tmr_req) | |
233 | { | |
234 | int no_build_r2ts = 0; | |
235 | u32 length = 0, offset = 0; | |
236 | struct iscsi_conn *conn = cmd->conn; | |
237 | struct se_cmd *se_cmd = &cmd->se_cmd; | |
238 | /* | |
239 | * The Initiator must not send a R2T SNACK with a Begrun less than | |
240 | * the TMR TASK_REASSIGN's ExpDataSN. | |
241 | */ | |
242 | if (!tmr_req->exp_data_sn) { | |
243 | cmd->cmd_flags &= ~ICF_GOT_DATACK_SNACK; | |
244 | cmd->acked_data_sn = 0; | |
245 | } else { | |
246 | cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; | |
247 | cmd->acked_data_sn = (tmr_req->exp_data_sn - 1); | |
248 | } | |
249 | ||
250 | /* | |
251 | * The TMR TASK_REASSIGN's ExpDataSN contains the next R2TSN the | |
252 | * Initiator is expecting. The Target controls all WRITE operations | |
253 | * so if we have received all DataOUT we can safety ignore Initiator. | |
254 | */ | |
255 | if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { | |
7d680f3b | 256 | if (!(cmd->se_cmd.transport_state & CMD_T_SENT)) { |
e48354ce NB |
257 | pr_debug("WRITE ITT: 0x%08x: t_state: %d" |
258 | " never sent to transport\n", | |
259 | cmd->init_task_tag, cmd->se_cmd.t_state); | |
67441b68 CH |
260 | target_execute_cmd(se_cmd); |
261 | return 0; | |
e48354ce NB |
262 | } |
263 | ||
264 | cmd->i_state = ISTATE_SEND_STATUS; | |
265 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
266 | return 0; | |
267 | } | |
268 | ||
269 | /* | |
270 | * Special case to deal with DataSequenceInOrder=No and Non-Immeidate | |
271 | * Unsolicited DataOut. | |
272 | */ | |
273 | if (cmd->unsolicited_data) { | |
274 | cmd->unsolicited_data = 0; | |
275 | ||
276 | offset = cmd->next_burst_len = cmd->write_data_done; | |
277 | ||
278 | if ((conn->sess->sess_ops->FirstBurstLength - offset) >= | |
ebf1d95c | 279 | cmd->se_cmd.data_length) { |
e48354ce | 280 | no_build_r2ts = 1; |
ebf1d95c | 281 | length = (cmd->se_cmd.data_length - offset); |
e48354ce NB |
282 | } else |
283 | length = (conn->sess->sess_ops->FirstBurstLength - offset); | |
284 | ||
285 | spin_lock_bh(&cmd->r2t_lock); | |
286 | if (iscsit_add_r2t_to_list(cmd, offset, length, 0, 0) < 0) { | |
287 | spin_unlock_bh(&cmd->r2t_lock); | |
288 | return -1; | |
289 | } | |
290 | cmd->outstanding_r2ts++; | |
291 | spin_unlock_bh(&cmd->r2t_lock); | |
292 | ||
293 | if (no_build_r2ts) | |
294 | return 0; | |
295 | } | |
296 | /* | |
297 | * iscsit_build_r2ts_for_cmd() can handle the rest from here. | |
298 | */ | |
8b1e1244 | 299 | return iscsit_build_r2ts_for_cmd(cmd, conn, true); |
e48354ce NB |
300 | } |
301 | ||
302 | static int iscsit_task_reassign_complete_read( | |
303 | struct iscsi_cmd *cmd, | |
304 | struct iscsi_tmr_req *tmr_req) | |
305 | { | |
306 | struct iscsi_conn *conn = cmd->conn; | |
307 | struct iscsi_datain_req *dr; | |
308 | struct se_cmd *se_cmd = &cmd->se_cmd; | |
309 | /* | |
310 | * The Initiator must not send a Data SNACK with a BegRun less than | |
311 | * the TMR TASK_REASSIGN's ExpDataSN. | |
312 | */ | |
313 | if (!tmr_req->exp_data_sn) { | |
314 | cmd->cmd_flags &= ~ICF_GOT_DATACK_SNACK; | |
315 | cmd->acked_data_sn = 0; | |
316 | } else { | |
317 | cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; | |
318 | cmd->acked_data_sn = (tmr_req->exp_data_sn - 1); | |
319 | } | |
320 | ||
7d680f3b | 321 | if (!(cmd->se_cmd.transport_state & CMD_T_SENT)) { |
e48354ce NB |
322 | pr_debug("READ ITT: 0x%08x: t_state: %d never sent to" |
323 | " transport\n", cmd->init_task_tag, | |
324 | cmd->se_cmd.t_state); | |
acf3ecc4 | 325 | transport_handle_cdb_direct(se_cmd); |
e48354ce NB |
326 | return 0; |
327 | } | |
328 | ||
7d680f3b | 329 | if (!(se_cmd->transport_state & CMD_T_COMPLETE)) { |
e48354ce NB |
330 | pr_err("READ ITT: 0x%08x: t_state: %d, never returned" |
331 | " from transport\n", cmd->init_task_tag, | |
332 | cmd->se_cmd.t_state); | |
333 | return -1; | |
334 | } | |
335 | ||
336 | dr = iscsit_allocate_datain_req(); | |
337 | if (!dr) | |
338 | return -1; | |
339 | /* | |
340 | * The TMR TASK_REASSIGN's ExpDataSN contains the next DataSN the | |
341 | * Initiator is expecting. | |
342 | */ | |
343 | dr->data_sn = dr->begrun = tmr_req->exp_data_sn; | |
344 | dr->runlength = 0; | |
345 | dr->generate_recovery_values = 1; | |
346 | dr->recovery = DATAIN_CONNECTION_RECOVERY; | |
347 | ||
348 | iscsit_attach_datain_req(cmd, dr); | |
349 | ||
350 | cmd->i_state = ISTATE_SEND_DATAIN; | |
351 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
352 | return 0; | |
353 | } | |
354 | ||
355 | static int iscsit_task_reassign_complete_none( | |
356 | struct iscsi_cmd *cmd, | |
357 | struct iscsi_tmr_req *tmr_req) | |
358 | { | |
359 | struct iscsi_conn *conn = cmd->conn; | |
360 | ||
361 | cmd->i_state = ISTATE_SEND_STATUS; | |
362 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
363 | return 0; | |
364 | } | |
365 | ||
366 | static int iscsit_task_reassign_complete_scsi_cmnd( | |
367 | struct iscsi_tmr_req *tmr_req, | |
368 | struct iscsi_conn *conn) | |
369 | { | |
9f3eb93e | 370 | struct iscsi_cmd *cmd = tmr_req->ref_cmd; |
e48354ce NB |
371 | struct iscsi_conn_recovery *cr; |
372 | ||
373 | if (!cmd->cr) { | |
374 | pr_err("struct iscsi_conn_recovery pointer for ITT: 0x%08x" | |
375 | " is NULL!\n", cmd->init_task_tag); | |
376 | return -1; | |
377 | } | |
378 | cr = cmd->cr; | |
379 | ||
380 | /* | |
381 | * Reset the StatSN so a new one for this commands new connection | |
382 | * will be assigned. | |
383 | * Reset the ExpStatSN as well so we may receive Status SNACKs. | |
384 | */ | |
385 | cmd->stat_sn = cmd->exp_stat_sn = 0; | |
386 | ||
387 | iscsit_task_reassign_remove_cmd(cmd, cr, conn->sess); | |
388 | ||
389 | spin_lock_bh(&conn->cmd_lock); | |
2fbb471e | 390 | list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); |
e48354ce NB |
391 | spin_unlock_bh(&conn->cmd_lock); |
392 | ||
9f3eb93e | 393 | if (cmd->se_cmd.se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
e48354ce NB |
394 | cmd->i_state = ISTATE_SEND_STATUS; |
395 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
396 | return 0; | |
397 | } | |
398 | ||
399 | switch (cmd->data_direction) { | |
400 | case DMA_TO_DEVICE: | |
401 | return iscsit_task_reassign_complete_write(cmd, tmr_req); | |
402 | case DMA_FROM_DEVICE: | |
403 | return iscsit_task_reassign_complete_read(cmd, tmr_req); | |
404 | case DMA_NONE: | |
405 | return iscsit_task_reassign_complete_none(cmd, tmr_req); | |
406 | default: | |
407 | pr_err("Unknown cmd->data_direction: 0x%02x\n", | |
408 | cmd->data_direction); | |
409 | return -1; | |
410 | } | |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
415 | static int iscsit_task_reassign_complete( | |
416 | struct iscsi_tmr_req *tmr_req, | |
417 | struct iscsi_conn *conn) | |
418 | { | |
e48354ce NB |
419 | struct iscsi_cmd *cmd; |
420 | int ret = 0; | |
421 | ||
9f3eb93e | 422 | if (!tmr_req->ref_cmd) { |
e48354ce NB |
423 | pr_err("TMR Request is missing a RefCmd struct iscsi_cmd.\n"); |
424 | return -1; | |
425 | } | |
9f3eb93e | 426 | cmd = tmr_req->ref_cmd; |
e48354ce NB |
427 | |
428 | cmd->conn = conn; | |
429 | ||
430 | switch (cmd->iscsi_opcode) { | |
431 | case ISCSI_OP_NOOP_OUT: | |
432 | ret = iscsit_task_reassign_complete_nop_out(tmr_req, conn); | |
433 | break; | |
434 | case ISCSI_OP_SCSI_CMD: | |
435 | ret = iscsit_task_reassign_complete_scsi_cmnd(tmr_req, conn); | |
436 | break; | |
437 | default: | |
438 | pr_err("Illegal iSCSI Opcode 0x%02x during" | |
439 | " command realligence\n", cmd->iscsi_opcode); | |
440 | return -1; | |
441 | } | |
442 | ||
443 | if (ret != 0) | |
444 | return ret; | |
445 | ||
446 | pr_debug("Completed connection realligence for Opcode: 0x%02x," | |
447 | " ITT: 0x%08x to CID: %hu.\n", cmd->iscsi_opcode, | |
448 | cmd->init_task_tag, conn->cid); | |
449 | ||
450 | return 0; | |
451 | } | |
452 | ||
453 | /* | |
454 | * Handles special after-the-fact actions related to TMRs. | |
455 | * Right now the only one that its really needed for is | |
456 | * connection recovery releated TASK_REASSIGN. | |
457 | */ | |
458 | extern int iscsit_tmr_post_handler(struct iscsi_cmd *cmd, struct iscsi_conn *conn) | |
459 | { | |
460 | struct iscsi_tmr_req *tmr_req = cmd->tmr_req; | |
461 | struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; | |
462 | ||
463 | if (tmr_req->task_reassign && | |
464 | (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) | |
465 | return iscsit_task_reassign_complete(tmr_req, conn); | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
470 | /* | |
471 | * Nothing to do here, but leave it for good measure. :-) | |
472 | */ | |
473 | int iscsit_task_reassign_prepare_read( | |
474 | struct iscsi_tmr_req *tmr_req, | |
475 | struct iscsi_conn *conn) | |
476 | { | |
477 | return 0; | |
478 | } | |
479 | ||
480 | static void iscsit_task_reassign_prepare_unsolicited_dataout( | |
481 | struct iscsi_cmd *cmd, | |
482 | struct iscsi_conn *conn) | |
483 | { | |
484 | int i, j; | |
485 | struct iscsi_pdu *pdu = NULL; | |
486 | struct iscsi_seq *seq = NULL; | |
487 | ||
488 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
489 | cmd->data_sn = 0; | |
490 | ||
491 | if (cmd->immediate_data) | |
492 | cmd->r2t_offset += (cmd->first_burst_len - | |
493 | cmd->seq_start_offset); | |
494 | ||
495 | if (conn->sess->sess_ops->DataPDUInOrder) { | |
496 | cmd->write_data_done -= (cmd->immediate_data) ? | |
497 | (cmd->first_burst_len - | |
498 | cmd->seq_start_offset) : | |
499 | cmd->first_burst_len; | |
500 | cmd->first_burst_len = 0; | |
501 | return; | |
502 | } | |
503 | ||
504 | for (i = 0; i < cmd->pdu_count; i++) { | |
505 | pdu = &cmd->pdu_list[i]; | |
506 | ||
507 | if (pdu->status != ISCSI_PDU_RECEIVED_OK) | |
508 | continue; | |
509 | ||
510 | if ((pdu->offset >= cmd->seq_start_offset) && | |
511 | ((pdu->offset + pdu->length) <= | |
512 | cmd->seq_end_offset)) { | |
513 | cmd->first_burst_len -= pdu->length; | |
514 | cmd->write_data_done -= pdu->length; | |
515 | pdu->status = ISCSI_PDU_NOT_RECEIVED; | |
516 | } | |
517 | } | |
518 | } else { | |
519 | for (i = 0; i < cmd->seq_count; i++) { | |
520 | seq = &cmd->seq_list[i]; | |
521 | ||
522 | if (seq->type != SEQTYPE_UNSOLICITED) | |
523 | continue; | |
524 | ||
525 | cmd->write_data_done -= | |
526 | (seq->offset - seq->orig_offset); | |
527 | cmd->first_burst_len = 0; | |
528 | seq->data_sn = 0; | |
529 | seq->offset = seq->orig_offset; | |
530 | seq->next_burst_len = 0; | |
531 | seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; | |
532 | ||
533 | if (conn->sess->sess_ops->DataPDUInOrder) | |
534 | continue; | |
535 | ||
536 | for (j = 0; j < seq->pdu_count; j++) { | |
537 | pdu = &cmd->pdu_list[j+seq->pdu_start]; | |
538 | ||
539 | if (pdu->status != ISCSI_PDU_RECEIVED_OK) | |
540 | continue; | |
541 | ||
542 | pdu->status = ISCSI_PDU_NOT_RECEIVED; | |
543 | } | |
544 | } | |
545 | } | |
546 | } | |
547 | ||
548 | int iscsit_task_reassign_prepare_write( | |
549 | struct iscsi_tmr_req *tmr_req, | |
550 | struct iscsi_conn *conn) | |
551 | { | |
9f3eb93e | 552 | struct iscsi_cmd *cmd = tmr_req->ref_cmd; |
e48354ce NB |
553 | struct iscsi_pdu *pdu = NULL; |
554 | struct iscsi_r2t *r2t = NULL, *r2t_tmp; | |
555 | int first_incomplete_r2t = 1, i = 0; | |
556 | ||
557 | /* | |
558 | * The command was in the process of receiving Unsolicited DataOUT when | |
559 | * the connection failed. | |
560 | */ | |
561 | if (cmd->unsolicited_data) | |
562 | iscsit_task_reassign_prepare_unsolicited_dataout(cmd, conn); | |
563 | ||
564 | /* | |
565 | * The Initiator is requesting R2Ts starting from zero, skip | |
566 | * checking acknowledged R2Ts and start checking struct iscsi_r2ts | |
567 | * greater than zero. | |
568 | */ | |
569 | if (!tmr_req->exp_data_sn) | |
570 | goto drop_unacknowledged_r2ts; | |
571 | ||
572 | /* | |
573 | * We now check that the PDUs in DataOUT sequences below | |
574 | * the TMR TASK_REASSIGN ExpDataSN (R2TSN the Initiator is | |
575 | * expecting next) have all the DataOUT they require to complete | |
576 | * the DataOUT sequence. First scan from R2TSN 0 to TMR | |
577 | * TASK_REASSIGN ExpDataSN-1. | |
578 | * | |
579 | * If we have not received all DataOUT in question, we must | |
580 | * make sure to make the appropriate changes to values in | |
581 | * struct iscsi_cmd (and elsewhere depending on session parameters) | |
582 | * so iscsit_build_r2ts_for_cmd() in iscsit_task_reassign_complete_write() | |
583 | * will resend a new R2T for the DataOUT sequences in question. | |
584 | */ | |
585 | spin_lock_bh(&cmd->r2t_lock); | |
586 | if (list_empty(&cmd->cmd_r2t_list)) { | |
587 | spin_unlock_bh(&cmd->r2t_lock); | |
588 | return -1; | |
589 | } | |
590 | ||
591 | list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { | |
592 | ||
593 | if (r2t->r2t_sn >= tmr_req->exp_data_sn) | |
594 | continue; | |
595 | /* | |
596 | * Safely ignore Recovery R2Ts and R2Ts that have completed | |
597 | * DataOUT sequences. | |
598 | */ | |
599 | if (r2t->seq_complete) | |
600 | continue; | |
601 | ||
602 | if (r2t->recovery_r2t) | |
603 | continue; | |
604 | ||
605 | /* | |
606 | * DataSequenceInOrder=Yes: | |
607 | * | |
608 | * Taking into account the iSCSI implementation requirement of | |
609 | * MaxOutstandingR2T=1 while ErrorRecoveryLevel>0 and | |
610 | * DataSequenceInOrder=Yes, we must take into consideration | |
611 | * the following: | |
612 | * | |
613 | * DataSequenceInOrder=No: | |
614 | * | |
615 | * Taking into account that the Initiator controls the (possibly | |
616 | * random) PDU Order in (possibly random) Sequence Order of | |
617 | * DataOUT the target requests with R2Ts, we must take into | |
618 | * consideration the following: | |
619 | * | |
620 | * DataPDUInOrder=Yes for DataSequenceInOrder=[Yes,No]: | |
621 | * | |
622 | * While processing non-complete R2T DataOUT sequence requests | |
623 | * the Target will re-request only the total sequence length | |
624 | * minus current received offset. This is because we must | |
625 | * assume the initiator will continue sending DataOUT from the | |
626 | * last PDU before the connection failed. | |
627 | * | |
628 | * DataPDUInOrder=No for DataSequenceInOrder=[Yes,No]: | |
629 | * | |
630 | * While processing non-complete R2T DataOUT sequence requests | |
631 | * the Target will re-request the entire DataOUT sequence if | |
632 | * any single PDU is missing from the sequence. This is because | |
633 | * we have no logical method to determine the next PDU offset, | |
634 | * and we must assume the Initiator will be sending any random | |
635 | * PDU offset in the current sequence after TASK_REASSIGN | |
636 | * has completed. | |
637 | */ | |
638 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
639 | if (!first_incomplete_r2t) { | |
640 | cmd->r2t_offset -= r2t->xfer_len; | |
641 | goto next; | |
642 | } | |
643 | ||
644 | if (conn->sess->sess_ops->DataPDUInOrder) { | |
645 | cmd->data_sn = 0; | |
646 | cmd->r2t_offset -= (r2t->xfer_len - | |
647 | cmd->next_burst_len); | |
648 | first_incomplete_r2t = 0; | |
649 | goto next; | |
650 | } | |
651 | ||
652 | cmd->data_sn = 0; | |
653 | cmd->r2t_offset -= r2t->xfer_len; | |
654 | ||
655 | for (i = 0; i < cmd->pdu_count; i++) { | |
656 | pdu = &cmd->pdu_list[i]; | |
657 | ||
658 | if (pdu->status != ISCSI_PDU_RECEIVED_OK) | |
659 | continue; | |
660 | ||
661 | if ((pdu->offset >= r2t->offset) && | |
662 | (pdu->offset < (r2t->offset + | |
663 | r2t->xfer_len))) { | |
664 | cmd->next_burst_len -= pdu->length; | |
665 | cmd->write_data_done -= pdu->length; | |
666 | pdu->status = ISCSI_PDU_NOT_RECEIVED; | |
667 | } | |
668 | } | |
669 | ||
670 | first_incomplete_r2t = 0; | |
671 | } else { | |
672 | struct iscsi_seq *seq; | |
673 | ||
674 | seq = iscsit_get_seq_holder(cmd, r2t->offset, | |
675 | r2t->xfer_len); | |
676 | if (!seq) { | |
677 | spin_unlock_bh(&cmd->r2t_lock); | |
678 | return -1; | |
679 | } | |
680 | ||
681 | cmd->write_data_done -= | |
682 | (seq->offset - seq->orig_offset); | |
683 | seq->data_sn = 0; | |
684 | seq->offset = seq->orig_offset; | |
685 | seq->next_burst_len = 0; | |
686 | seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; | |
687 | ||
688 | cmd->seq_send_order--; | |
689 | ||
690 | if (conn->sess->sess_ops->DataPDUInOrder) | |
691 | goto next; | |
692 | ||
693 | for (i = 0; i < seq->pdu_count; i++) { | |
694 | pdu = &cmd->pdu_list[i+seq->pdu_start]; | |
695 | ||
696 | if (pdu->status != ISCSI_PDU_RECEIVED_OK) | |
697 | continue; | |
698 | ||
699 | pdu->status = ISCSI_PDU_NOT_RECEIVED; | |
700 | } | |
701 | } | |
702 | ||
703 | next: | |
704 | cmd->outstanding_r2ts--; | |
705 | } | |
706 | spin_unlock_bh(&cmd->r2t_lock); | |
707 | ||
708 | /* | |
709 | * We now drop all unacknowledged R2Ts, ie: ExpDataSN from TMR | |
710 | * TASK_REASSIGN to the last R2T in the list.. We are also careful | |
711 | * to check that the Initiator is not requesting R2Ts for DataOUT | |
712 | * sequences it has already completed. | |
713 | * | |
714 | * Free each R2T in question and adjust values in struct iscsi_cmd | |
715 | * accordingly so iscsit_build_r2ts_for_cmd() do the rest of | |
716 | * the work after the TMR TASK_REASSIGN Response is sent. | |
717 | */ | |
718 | drop_unacknowledged_r2ts: | |
719 | ||
720 | cmd->cmd_flags &= ~ICF_SENT_LAST_R2T; | |
721 | cmd->r2t_sn = tmr_req->exp_data_sn; | |
722 | ||
723 | spin_lock_bh(&cmd->r2t_lock); | |
724 | list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list) { | |
725 | /* | |
726 | * Skip up to the R2T Sequence number provided by the | |
727 | * iSCSI TASK_REASSIGN TMR | |
728 | */ | |
729 | if (r2t->r2t_sn < tmr_req->exp_data_sn) | |
730 | continue; | |
731 | ||
732 | if (r2t->seq_complete) { | |
733 | pr_err("Initiator is requesting R2Ts from" | |
734 | " R2TSN: 0x%08x, but R2TSN: 0x%08x, Offset: %u," | |
735 | " Length: %u is already complete." | |
736 | " BAD INITIATOR ERL=2 IMPLEMENTATION!\n", | |
737 | tmr_req->exp_data_sn, r2t->r2t_sn, | |
738 | r2t->offset, r2t->xfer_len); | |
739 | spin_unlock_bh(&cmd->r2t_lock); | |
740 | return -1; | |
741 | } | |
742 | ||
743 | if (r2t->recovery_r2t) { | |
744 | iscsit_free_r2t(r2t, cmd); | |
745 | continue; | |
746 | } | |
747 | ||
748 | /* DataSequenceInOrder=Yes: | |
749 | * | |
750 | * Taking into account the iSCSI implementation requirement of | |
751 | * MaxOutstandingR2T=1 while ErrorRecoveryLevel>0 and | |
752 | * DataSequenceInOrder=Yes, it's safe to subtract the R2Ts | |
753 | * entire transfer length from the commands R2T offset marker. | |
754 | * | |
755 | * DataSequenceInOrder=No: | |
756 | * | |
757 | * We subtract the difference from struct iscsi_seq between the | |
758 | * current offset and original offset from cmd->write_data_done | |
759 | * for account for DataOUT PDUs already received. Then reset | |
760 | * the current offset to the original and zero out the current | |
761 | * burst length, to make sure we re-request the entire DataOUT | |
762 | * sequence. | |
763 | */ | |
764 | if (conn->sess->sess_ops->DataSequenceInOrder) | |
765 | cmd->r2t_offset -= r2t->xfer_len; | |
766 | else | |
767 | cmd->seq_send_order--; | |
768 | ||
769 | cmd->outstanding_r2ts--; | |
770 | iscsit_free_r2t(r2t, cmd); | |
771 | } | |
772 | spin_unlock_bh(&cmd->r2t_lock); | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
777 | /* | |
778 | * Performs sanity checks TMR TASK_REASSIGN's ExpDataSN for | |
779 | * a given struct iscsi_cmd. | |
780 | */ | |
781 | int iscsit_check_task_reassign_expdatasn( | |
782 | struct iscsi_tmr_req *tmr_req, | |
783 | struct iscsi_conn *conn) | |
784 | { | |
9f3eb93e | 785 | struct iscsi_cmd *ref_cmd = tmr_req->ref_cmd; |
e48354ce NB |
786 | |
787 | if (ref_cmd->iscsi_opcode != ISCSI_OP_SCSI_CMD) | |
788 | return 0; | |
789 | ||
9f3eb93e | 790 | if (ref_cmd->se_cmd.se_cmd_flags & SCF_SENT_CHECK_CONDITION) |
e48354ce NB |
791 | return 0; |
792 | ||
793 | if (ref_cmd->data_direction == DMA_NONE) | |
794 | return 0; | |
795 | ||
796 | /* | |
797 | * For READs the TMR TASK_REASSIGNs ExpDataSN contains the next DataSN | |
798 | * of DataIN the Initiator is expecting. | |
799 | * | |
800 | * Also check that the Initiator is not re-requesting DataIN that has | |
801 | * already been acknowledged with a DataAck SNACK. | |
802 | */ | |
803 | if (ref_cmd->data_direction == DMA_FROM_DEVICE) { | |
804 | if (tmr_req->exp_data_sn > ref_cmd->data_sn) { | |
805 | pr_err("Received ExpDataSN: 0x%08x for READ" | |
806 | " in TMR TASK_REASSIGN greater than command's" | |
807 | " DataSN: 0x%08x.\n", tmr_req->exp_data_sn, | |
808 | ref_cmd->data_sn); | |
809 | return -1; | |
810 | } | |
811 | if ((ref_cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && | |
812 | (tmr_req->exp_data_sn <= ref_cmd->acked_data_sn)) { | |
813 | pr_err("Received ExpDataSN: 0x%08x for READ" | |
814 | " in TMR TASK_REASSIGN for previously" | |
815 | " acknowledged DataIN: 0x%08x," | |
816 | " protocol error\n", tmr_req->exp_data_sn, | |
817 | ref_cmd->acked_data_sn); | |
818 | return -1; | |
819 | } | |
820 | return iscsit_task_reassign_prepare_read(tmr_req, conn); | |
821 | } | |
822 | ||
823 | /* | |
824 | * For WRITEs the TMR TASK_REASSIGNs ExpDataSN contains the next R2TSN | |
825 | * for R2Ts the Initiator is expecting. | |
826 | * | |
827 | * Do the magic in iscsit_task_reassign_prepare_write(). | |
828 | */ | |
829 | if (ref_cmd->data_direction == DMA_TO_DEVICE) { | |
830 | if (tmr_req->exp_data_sn > ref_cmd->r2t_sn) { | |
831 | pr_err("Received ExpDataSN: 0x%08x for WRITE" | |
832 | " in TMR TASK_REASSIGN greater than command's" | |
833 | " R2TSN: 0x%08x.\n", tmr_req->exp_data_sn, | |
834 | ref_cmd->r2t_sn); | |
835 | return -1; | |
836 | } | |
837 | return iscsit_task_reassign_prepare_write(tmr_req, conn); | |
838 | } | |
839 | ||
840 | pr_err("Unknown iSCSI data_direction: 0x%02x\n", | |
841 | ref_cmd->data_direction); | |
842 | ||
843 | return -1; | |
844 | } |