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e48354ce NB |
1 | /******************************************************************************* |
2 | * This file contains error recovery level two functions used by | |
3 | * the iSCSI Target driver. | |
4 | * | |
5 | * \u00a9 Copyright 2007-2011 RisingTide Systems LLC. | |
6 | * | |
7 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. | |
8 | * | |
9 | * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | ******************************************************************************/ | |
21 | ||
22 | #include <scsi/iscsi_proto.h> | |
23 | #include <target/target_core_base.h> | |
c4795fb2 | 24 | #include <target/target_core_fabric.h> |
e48354ce NB |
25 | |
26 | #include "iscsi_target_core.h" | |
27 | #include "iscsi_target_datain_values.h" | |
28 | #include "iscsi_target_util.h" | |
29 | #include "iscsi_target_erl0.h" | |
30 | #include "iscsi_target_erl1.h" | |
31 | #include "iscsi_target_erl2.h" | |
32 | #include "iscsi_target.h" | |
33 | ||
34 | /* | |
35 | * FIXME: Does RData SNACK apply here as well? | |
36 | */ | |
37 | void iscsit_create_conn_recovery_datain_values( | |
38 | struct iscsi_cmd *cmd, | |
50e5c87d | 39 | __be32 exp_data_sn) |
e48354ce NB |
40 | { |
41 | u32 data_sn = 0; | |
42 | struct iscsi_conn *conn = cmd->conn; | |
43 | ||
44 | cmd->next_burst_len = 0; | |
45 | cmd->read_data_done = 0; | |
46 | ||
50e5c87d | 47 | while (be32_to_cpu(exp_data_sn) > data_sn) { |
e48354ce NB |
48 | if ((cmd->next_burst_len + |
49 | conn->conn_ops->MaxRecvDataSegmentLength) < | |
50 | conn->sess->sess_ops->MaxBurstLength) { | |
51 | cmd->read_data_done += | |
52 | conn->conn_ops->MaxRecvDataSegmentLength; | |
53 | cmd->next_burst_len += | |
54 | conn->conn_ops->MaxRecvDataSegmentLength; | |
55 | } else { | |
56 | cmd->read_data_done += | |
57 | (conn->sess->sess_ops->MaxBurstLength - | |
58 | cmd->next_burst_len); | |
59 | cmd->next_burst_len = 0; | |
60 | } | |
61 | data_sn++; | |
62 | } | |
63 | } | |
64 | ||
65 | void iscsit_create_conn_recovery_dataout_values( | |
66 | struct iscsi_cmd *cmd) | |
67 | { | |
68 | u32 write_data_done = 0; | |
69 | struct iscsi_conn *conn = cmd->conn; | |
70 | ||
71 | cmd->data_sn = 0; | |
72 | cmd->next_burst_len = 0; | |
73 | ||
74 | while (cmd->write_data_done > write_data_done) { | |
75 | if ((write_data_done + conn->sess->sess_ops->MaxBurstLength) <= | |
76 | cmd->write_data_done) | |
77 | write_data_done += conn->sess->sess_ops->MaxBurstLength; | |
78 | else | |
79 | break; | |
80 | } | |
81 | ||
82 | cmd->write_data_done = write_data_done; | |
83 | } | |
84 | ||
85 | static int iscsit_attach_active_connection_recovery_entry( | |
86 | struct iscsi_session *sess, | |
87 | struct iscsi_conn_recovery *cr) | |
88 | { | |
89 | spin_lock(&sess->cr_a_lock); | |
90 | list_add_tail(&cr->cr_list, &sess->cr_active_list); | |
91 | spin_unlock(&sess->cr_a_lock); | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
96 | static int iscsit_attach_inactive_connection_recovery_entry( | |
97 | struct iscsi_session *sess, | |
98 | struct iscsi_conn_recovery *cr) | |
99 | { | |
100 | spin_lock(&sess->cr_i_lock); | |
101 | list_add_tail(&cr->cr_list, &sess->cr_inactive_list); | |
102 | ||
103 | sess->conn_recovery_count++; | |
104 | pr_debug("Incremented connection recovery count to %u for" | |
105 | " SID: %u\n", sess->conn_recovery_count, sess->sid); | |
106 | spin_unlock(&sess->cr_i_lock); | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | struct iscsi_conn_recovery *iscsit_get_inactive_connection_recovery_entry( | |
112 | struct iscsi_session *sess, | |
113 | u16 cid) | |
114 | { | |
115 | struct iscsi_conn_recovery *cr; | |
116 | ||
117 | spin_lock(&sess->cr_i_lock); | |
118 | list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { | |
119 | if (cr->cid == cid) { | |
120 | spin_unlock(&sess->cr_i_lock); | |
121 | return cr; | |
122 | } | |
123 | } | |
124 | spin_unlock(&sess->cr_i_lock); | |
125 | ||
126 | return NULL; | |
127 | } | |
128 | ||
129 | void iscsit_free_connection_recovery_entires(struct iscsi_session *sess) | |
130 | { | |
131 | struct iscsi_cmd *cmd, *cmd_tmp; | |
132 | struct iscsi_conn_recovery *cr, *cr_tmp; | |
133 | ||
134 | spin_lock(&sess->cr_a_lock); | |
135 | list_for_each_entry_safe(cr, cr_tmp, &sess->cr_active_list, cr_list) { | |
136 | list_del(&cr->cr_list); | |
137 | spin_unlock(&sess->cr_a_lock); | |
138 | ||
139 | spin_lock(&cr->conn_recovery_cmd_lock); | |
140 | list_for_each_entry_safe(cmd, cmd_tmp, | |
2fbb471e | 141 | &cr->conn_recovery_cmd_list, i_conn_node) { |
e48354ce | 142 | |
2fbb471e | 143 | list_del(&cmd->i_conn_node); |
e48354ce NB |
144 | cmd->conn = NULL; |
145 | spin_unlock(&cr->conn_recovery_cmd_lock); | |
d270190a | 146 | iscsit_free_cmd(cmd); |
e48354ce NB |
147 | spin_lock(&cr->conn_recovery_cmd_lock); |
148 | } | |
149 | spin_unlock(&cr->conn_recovery_cmd_lock); | |
150 | spin_lock(&sess->cr_a_lock); | |
151 | ||
152 | kfree(cr); | |
153 | } | |
154 | spin_unlock(&sess->cr_a_lock); | |
155 | ||
156 | spin_lock(&sess->cr_i_lock); | |
157 | list_for_each_entry_safe(cr, cr_tmp, &sess->cr_inactive_list, cr_list) { | |
158 | list_del(&cr->cr_list); | |
159 | spin_unlock(&sess->cr_i_lock); | |
160 | ||
161 | spin_lock(&cr->conn_recovery_cmd_lock); | |
162 | list_for_each_entry_safe(cmd, cmd_tmp, | |
2fbb471e | 163 | &cr->conn_recovery_cmd_list, i_conn_node) { |
e48354ce | 164 | |
2fbb471e | 165 | list_del(&cmd->i_conn_node); |
e48354ce NB |
166 | cmd->conn = NULL; |
167 | spin_unlock(&cr->conn_recovery_cmd_lock); | |
d270190a | 168 | iscsit_free_cmd(cmd); |
e48354ce NB |
169 | spin_lock(&cr->conn_recovery_cmd_lock); |
170 | } | |
171 | spin_unlock(&cr->conn_recovery_cmd_lock); | |
172 | spin_lock(&sess->cr_i_lock); | |
173 | ||
174 | kfree(cr); | |
175 | } | |
176 | spin_unlock(&sess->cr_i_lock); | |
177 | } | |
178 | ||
179 | int iscsit_remove_active_connection_recovery_entry( | |
180 | struct iscsi_conn_recovery *cr, | |
181 | struct iscsi_session *sess) | |
182 | { | |
183 | spin_lock(&sess->cr_a_lock); | |
184 | list_del(&cr->cr_list); | |
185 | ||
186 | sess->conn_recovery_count--; | |
187 | pr_debug("Decremented connection recovery count to %u for" | |
188 | " SID: %u\n", sess->conn_recovery_count, sess->sid); | |
189 | spin_unlock(&sess->cr_a_lock); | |
190 | ||
191 | kfree(cr); | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
fceb5bc7 | 196 | static void iscsit_remove_inactive_connection_recovery_entry( |
e48354ce NB |
197 | struct iscsi_conn_recovery *cr, |
198 | struct iscsi_session *sess) | |
199 | { | |
200 | spin_lock(&sess->cr_i_lock); | |
201 | list_del(&cr->cr_list); | |
202 | spin_unlock(&sess->cr_i_lock); | |
e48354ce NB |
203 | } |
204 | ||
205 | /* | |
206 | * Called with cr->conn_recovery_cmd_lock help. | |
207 | */ | |
208 | int iscsit_remove_cmd_from_connection_recovery( | |
209 | struct iscsi_cmd *cmd, | |
210 | struct iscsi_session *sess) | |
211 | { | |
212 | struct iscsi_conn_recovery *cr; | |
213 | ||
214 | if (!cmd->cr) { | |
215 | pr_err("struct iscsi_conn_recovery pointer for ITT: 0x%08x" | |
216 | " is NULL!\n", cmd->init_task_tag); | |
217 | BUG(); | |
218 | } | |
219 | cr = cmd->cr; | |
220 | ||
2fbb471e | 221 | list_del(&cmd->i_conn_node); |
e48354ce NB |
222 | return --cr->cmd_count; |
223 | } | |
224 | ||
225 | void iscsit_discard_cr_cmds_by_expstatsn( | |
226 | struct iscsi_conn_recovery *cr, | |
227 | u32 exp_statsn) | |
228 | { | |
229 | u32 dropped_count = 0; | |
230 | struct iscsi_cmd *cmd, *cmd_tmp; | |
231 | struct iscsi_session *sess = cr->sess; | |
232 | ||
233 | spin_lock(&cr->conn_recovery_cmd_lock); | |
234 | list_for_each_entry_safe(cmd, cmd_tmp, | |
2fbb471e | 235 | &cr->conn_recovery_cmd_list, i_conn_node) { |
e48354ce NB |
236 | |
237 | if (((cmd->deferred_i_state != ISTATE_SENT_STATUS) && | |
238 | (cmd->deferred_i_state != ISTATE_REMOVE)) || | |
239 | (cmd->stat_sn >= exp_statsn)) { | |
240 | continue; | |
241 | } | |
242 | ||
243 | dropped_count++; | |
244 | pr_debug("Dropping Acknowledged ITT: 0x%08x, StatSN:" | |
245 | " 0x%08x, CID: %hu.\n", cmd->init_task_tag, | |
246 | cmd->stat_sn, cr->cid); | |
247 | ||
248 | iscsit_remove_cmd_from_connection_recovery(cmd, sess); | |
249 | ||
250 | spin_unlock(&cr->conn_recovery_cmd_lock); | |
d270190a | 251 | iscsit_free_cmd(cmd); |
e48354ce NB |
252 | spin_lock(&cr->conn_recovery_cmd_lock); |
253 | } | |
254 | spin_unlock(&cr->conn_recovery_cmd_lock); | |
255 | ||
256 | pr_debug("Dropped %u total acknowledged commands on" | |
257 | " CID: %hu less than old ExpStatSN: 0x%08x\n", | |
258 | dropped_count, cr->cid, exp_statsn); | |
259 | ||
260 | if (!cr->cmd_count) { | |
261 | pr_debug("No commands to be reassigned for failed" | |
262 | " connection CID: %hu on SID: %u\n", | |
263 | cr->cid, sess->sid); | |
264 | iscsit_remove_inactive_connection_recovery_entry(cr, sess); | |
265 | iscsit_attach_active_connection_recovery_entry(sess, cr); | |
266 | pr_debug("iSCSI connection recovery successful for CID:" | |
267 | " %hu on SID: %u\n", cr->cid, sess->sid); | |
268 | iscsit_remove_active_connection_recovery_entry(cr, sess); | |
269 | } else { | |
270 | iscsit_remove_inactive_connection_recovery_entry(cr, sess); | |
271 | iscsit_attach_active_connection_recovery_entry(sess, cr); | |
272 | } | |
273 | } | |
274 | ||
275 | int iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(struct iscsi_conn *conn) | |
276 | { | |
277 | u32 dropped_count = 0; | |
278 | struct iscsi_cmd *cmd, *cmd_tmp; | |
279 | struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; | |
280 | struct iscsi_session *sess = conn->sess; | |
281 | ||
282 | mutex_lock(&sess->cmdsn_mutex); | |
283 | list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, | |
284 | &sess->sess_ooo_cmdsn_list, ooo_list) { | |
285 | ||
286 | if (ooo_cmdsn->cid != conn->cid) | |
287 | continue; | |
288 | ||
289 | dropped_count++; | |
290 | pr_debug("Dropping unacknowledged CmdSN:" | |
291 | " 0x%08x during connection recovery on CID: %hu\n", | |
292 | ooo_cmdsn->cmdsn, conn->cid); | |
293 | iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); | |
294 | } | |
295 | mutex_unlock(&sess->cmdsn_mutex); | |
296 | ||
297 | spin_lock_bh(&conn->cmd_lock); | |
2fbb471e | 298 | list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) { |
e48354ce NB |
299 | if (!(cmd->cmd_flags & ICF_OOO_CMDSN)) |
300 | continue; | |
301 | ||
2fbb471e | 302 | list_del(&cmd->i_conn_node); |
e48354ce NB |
303 | |
304 | spin_unlock_bh(&conn->cmd_lock); | |
d270190a | 305 | iscsit_free_cmd(cmd); |
e48354ce NB |
306 | spin_lock_bh(&conn->cmd_lock); |
307 | } | |
308 | spin_unlock_bh(&conn->cmd_lock); | |
309 | ||
310 | pr_debug("Dropped %u total unacknowledged commands on CID:" | |
311 | " %hu for ExpCmdSN: 0x%08x.\n", dropped_count, conn->cid, | |
312 | sess->exp_cmd_sn); | |
313 | return 0; | |
314 | } | |
315 | ||
316 | int iscsit_prepare_cmds_for_realligance(struct iscsi_conn *conn) | |
317 | { | |
318 | u32 cmd_count = 0; | |
319 | struct iscsi_cmd *cmd, *cmd_tmp; | |
320 | struct iscsi_conn_recovery *cr; | |
321 | ||
322 | /* | |
323 | * Allocate an struct iscsi_conn_recovery for this connection. | |
324 | * Each struct iscsi_cmd contains an struct iscsi_conn_recovery pointer | |
325 | * (struct iscsi_cmd->cr) so we need to allocate this before preparing the | |
326 | * connection's command list for connection recovery. | |
327 | */ | |
328 | cr = kzalloc(sizeof(struct iscsi_conn_recovery), GFP_KERNEL); | |
329 | if (!cr) { | |
330 | pr_err("Unable to allocate memory for" | |
331 | " struct iscsi_conn_recovery.\n"); | |
332 | return -1; | |
333 | } | |
334 | INIT_LIST_HEAD(&cr->cr_list); | |
335 | INIT_LIST_HEAD(&cr->conn_recovery_cmd_list); | |
336 | spin_lock_init(&cr->conn_recovery_cmd_lock); | |
337 | /* | |
338 | * Only perform connection recovery on ISCSI_OP_SCSI_CMD or | |
339 | * ISCSI_OP_NOOP_OUT opcodes. For all other opcodes call | |
2fbb471e | 340 | * list_del(&cmd->i_conn_node); to release the command to the |
e48354ce NB |
341 | * session pool and remove it from the connection's list. |
342 | * | |
343 | * Also stop the DataOUT timer, which will be restarted after | |
344 | * sending the TMR response. | |
345 | */ | |
346 | spin_lock_bh(&conn->cmd_lock); | |
2fbb471e | 347 | list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) { |
e48354ce NB |
348 | |
349 | if ((cmd->iscsi_opcode != ISCSI_OP_SCSI_CMD) && | |
350 | (cmd->iscsi_opcode != ISCSI_OP_NOOP_OUT)) { | |
351 | pr_debug("Not performing realligence on" | |
352 | " Opcode: 0x%02x, ITT: 0x%08x, CmdSN: 0x%08x," | |
353 | " CID: %hu\n", cmd->iscsi_opcode, | |
354 | cmd->init_task_tag, cmd->cmd_sn, conn->cid); | |
355 | ||
2fbb471e | 356 | list_del(&cmd->i_conn_node); |
e48354ce | 357 | spin_unlock_bh(&conn->cmd_lock); |
d270190a | 358 | iscsit_free_cmd(cmd); |
e48354ce NB |
359 | spin_lock_bh(&conn->cmd_lock); |
360 | continue; | |
361 | } | |
362 | ||
363 | /* | |
364 | * Special case where commands greater than or equal to | |
365 | * the session's ExpCmdSN are attached to the connection | |
366 | * list but not to the out of order CmdSN list. The one | |
367 | * obvious case is when a command with immediate data | |
368 | * attached must only check the CmdSN against ExpCmdSN | |
369 | * after the data is received. The special case below | |
370 | * is when the connection fails before data is received, | |
371 | * but also may apply to other PDUs, so it has been | |
372 | * made generic here. | |
373 | */ | |
374 | if (!(cmd->cmd_flags & ICF_OOO_CMDSN) && !cmd->immediate_cmd && | |
375 | (cmd->cmd_sn >= conn->sess->exp_cmd_sn)) { | |
2fbb471e | 376 | list_del(&cmd->i_conn_node); |
e48354ce | 377 | spin_unlock_bh(&conn->cmd_lock); |
d270190a | 378 | iscsit_free_cmd(cmd); |
e48354ce NB |
379 | spin_lock_bh(&conn->cmd_lock); |
380 | continue; | |
381 | } | |
382 | ||
383 | cmd_count++; | |
384 | pr_debug("Preparing Opcode: 0x%02x, ITT: 0x%08x," | |
385 | " CmdSN: 0x%08x, StatSN: 0x%08x, CID: %hu for" | |
386 | " realligence.\n", cmd->iscsi_opcode, | |
387 | cmd->init_task_tag, cmd->cmd_sn, cmd->stat_sn, | |
388 | conn->cid); | |
389 | ||
390 | cmd->deferred_i_state = cmd->i_state; | |
391 | cmd->i_state = ISTATE_IN_CONNECTION_RECOVERY; | |
392 | ||
393 | if (cmd->data_direction == DMA_TO_DEVICE) | |
394 | iscsit_stop_dataout_timer(cmd); | |
395 | ||
396 | cmd->sess = conn->sess; | |
397 | ||
2fbb471e | 398 | list_del(&cmd->i_conn_node); |
e48354ce NB |
399 | spin_unlock_bh(&conn->cmd_lock); |
400 | ||
401 | iscsit_free_all_datain_reqs(cmd); | |
402 | ||
d270190a | 403 | transport_wait_for_tasks(&cmd->se_cmd); |
e48354ce NB |
404 | /* |
405 | * Add the struct iscsi_cmd to the connection recovery cmd list | |
406 | */ | |
407 | spin_lock(&cr->conn_recovery_cmd_lock); | |
2fbb471e | 408 | list_add_tail(&cmd->i_conn_node, &cr->conn_recovery_cmd_list); |
e48354ce NB |
409 | spin_unlock(&cr->conn_recovery_cmd_lock); |
410 | ||
411 | spin_lock_bh(&conn->cmd_lock); | |
412 | cmd->cr = cr; | |
413 | cmd->conn = NULL; | |
414 | } | |
415 | spin_unlock_bh(&conn->cmd_lock); | |
416 | /* | |
417 | * Fill in the various values in the preallocated struct iscsi_conn_recovery. | |
418 | */ | |
419 | cr->cid = conn->cid; | |
420 | cr->cmd_count = cmd_count; | |
421 | cr->maxrecvdatasegmentlength = conn->conn_ops->MaxRecvDataSegmentLength; | |
1c417f39 | 422 | cr->maxxmitdatasegmentlength = conn->conn_ops->MaxXmitDataSegmentLength; |
e48354ce NB |
423 | cr->sess = conn->sess; |
424 | ||
425 | iscsit_attach_inactive_connection_recovery_entry(conn->sess, cr); | |
426 | ||
427 | return 0; | |
428 | } | |
429 | ||
430 | int iscsit_connection_recovery_transport_reset(struct iscsi_conn *conn) | |
431 | { | |
432 | atomic_set(&conn->connection_recovery, 1); | |
433 | ||
434 | if (iscsit_close_connection(conn) < 0) | |
435 | return -1; | |
436 | ||
437 | return 0; | |
438 | } |