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e48354ce NB |
1 | /******************************************************************************* |
2 | * This file contains error recovery level two functions used by | |
3 | * the iSCSI Target driver. | |
4 | * | |
4c76251e | 5 | * (c) Copyright 2007-2013 Datera, Inc. |
e48354ce NB |
6 | * |
7 | * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | ******************************************************************************/ | |
19 | ||
20 | #include <scsi/iscsi_proto.h> | |
21 | #include <target/target_core_base.h> | |
c4795fb2 | 22 | #include <target/target_core_fabric.h> |
e48354ce | 23 | |
67f091f2 | 24 | #include <target/iscsi/iscsi_target_core.h> |
e48354ce NB |
25 | #include "iscsi_target_datain_values.h" |
26 | #include "iscsi_target_util.h" | |
27 | #include "iscsi_target_erl0.h" | |
28 | #include "iscsi_target_erl1.h" | |
29 | #include "iscsi_target_erl2.h" | |
30 | #include "iscsi_target.h" | |
31 | ||
32 | /* | |
33 | * FIXME: Does RData SNACK apply here as well? | |
34 | */ | |
35 | void iscsit_create_conn_recovery_datain_values( | |
36 | struct iscsi_cmd *cmd, | |
50e5c87d | 37 | __be32 exp_data_sn) |
e48354ce NB |
38 | { |
39 | u32 data_sn = 0; | |
40 | struct iscsi_conn *conn = cmd->conn; | |
41 | ||
42 | cmd->next_burst_len = 0; | |
43 | cmd->read_data_done = 0; | |
44 | ||
50e5c87d | 45 | while (be32_to_cpu(exp_data_sn) > data_sn) { |
e48354ce NB |
46 | if ((cmd->next_burst_len + |
47 | conn->conn_ops->MaxRecvDataSegmentLength) < | |
48 | conn->sess->sess_ops->MaxBurstLength) { | |
49 | cmd->read_data_done += | |
50 | conn->conn_ops->MaxRecvDataSegmentLength; | |
51 | cmd->next_burst_len += | |
52 | conn->conn_ops->MaxRecvDataSegmentLength; | |
53 | } else { | |
54 | cmd->read_data_done += | |
55 | (conn->sess->sess_ops->MaxBurstLength - | |
56 | cmd->next_burst_len); | |
57 | cmd->next_burst_len = 0; | |
58 | } | |
59 | data_sn++; | |
60 | } | |
61 | } | |
62 | ||
63 | void iscsit_create_conn_recovery_dataout_values( | |
64 | struct iscsi_cmd *cmd) | |
65 | { | |
66 | u32 write_data_done = 0; | |
67 | struct iscsi_conn *conn = cmd->conn; | |
68 | ||
69 | cmd->data_sn = 0; | |
70 | cmd->next_burst_len = 0; | |
71 | ||
72 | while (cmd->write_data_done > write_data_done) { | |
73 | if ((write_data_done + conn->sess->sess_ops->MaxBurstLength) <= | |
74 | cmd->write_data_done) | |
75 | write_data_done += conn->sess->sess_ops->MaxBurstLength; | |
76 | else | |
77 | break; | |
78 | } | |
79 | ||
80 | cmd->write_data_done = write_data_done; | |
81 | } | |
82 | ||
83 | static int iscsit_attach_active_connection_recovery_entry( | |
84 | struct iscsi_session *sess, | |
85 | struct iscsi_conn_recovery *cr) | |
86 | { | |
87 | spin_lock(&sess->cr_a_lock); | |
88 | list_add_tail(&cr->cr_list, &sess->cr_active_list); | |
89 | spin_unlock(&sess->cr_a_lock); | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
94 | static int iscsit_attach_inactive_connection_recovery_entry( | |
95 | struct iscsi_session *sess, | |
96 | struct iscsi_conn_recovery *cr) | |
97 | { | |
98 | spin_lock(&sess->cr_i_lock); | |
99 | list_add_tail(&cr->cr_list, &sess->cr_inactive_list); | |
100 | ||
101 | sess->conn_recovery_count++; | |
102 | pr_debug("Incremented connection recovery count to %u for" | |
103 | " SID: %u\n", sess->conn_recovery_count, sess->sid); | |
104 | spin_unlock(&sess->cr_i_lock); | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | struct iscsi_conn_recovery *iscsit_get_inactive_connection_recovery_entry( | |
110 | struct iscsi_session *sess, | |
111 | u16 cid) | |
112 | { | |
113 | struct iscsi_conn_recovery *cr; | |
114 | ||
115 | spin_lock(&sess->cr_i_lock); | |
116 | list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { | |
117 | if (cr->cid == cid) { | |
118 | spin_unlock(&sess->cr_i_lock); | |
119 | return cr; | |
120 | } | |
121 | } | |
122 | spin_unlock(&sess->cr_i_lock); | |
123 | ||
124 | return NULL; | |
125 | } | |
126 | ||
127 | void iscsit_free_connection_recovery_entires(struct iscsi_session *sess) | |
128 | { | |
129 | struct iscsi_cmd *cmd, *cmd_tmp; | |
130 | struct iscsi_conn_recovery *cr, *cr_tmp; | |
131 | ||
132 | spin_lock(&sess->cr_a_lock); | |
133 | list_for_each_entry_safe(cr, cr_tmp, &sess->cr_active_list, cr_list) { | |
134 | list_del(&cr->cr_list); | |
135 | spin_unlock(&sess->cr_a_lock); | |
136 | ||
137 | spin_lock(&cr->conn_recovery_cmd_lock); | |
138 | list_for_each_entry_safe(cmd, cmd_tmp, | |
2fbb471e | 139 | &cr->conn_recovery_cmd_list, i_conn_node) { |
e48354ce | 140 | |
5159d763 | 141 | list_del_init(&cmd->i_conn_node); |
e48354ce NB |
142 | cmd->conn = NULL; |
143 | spin_unlock(&cr->conn_recovery_cmd_lock); | |
aafc9d15 | 144 | iscsit_free_cmd(cmd, true); |
e48354ce NB |
145 | spin_lock(&cr->conn_recovery_cmd_lock); |
146 | } | |
147 | spin_unlock(&cr->conn_recovery_cmd_lock); | |
148 | spin_lock(&sess->cr_a_lock); | |
149 | ||
150 | kfree(cr); | |
151 | } | |
152 | spin_unlock(&sess->cr_a_lock); | |
153 | ||
154 | spin_lock(&sess->cr_i_lock); | |
155 | list_for_each_entry_safe(cr, cr_tmp, &sess->cr_inactive_list, cr_list) { | |
156 | list_del(&cr->cr_list); | |
157 | spin_unlock(&sess->cr_i_lock); | |
158 | ||
159 | spin_lock(&cr->conn_recovery_cmd_lock); | |
160 | list_for_each_entry_safe(cmd, cmd_tmp, | |
2fbb471e | 161 | &cr->conn_recovery_cmd_list, i_conn_node) { |
e48354ce | 162 | |
5159d763 | 163 | list_del_init(&cmd->i_conn_node); |
e48354ce NB |
164 | cmd->conn = NULL; |
165 | spin_unlock(&cr->conn_recovery_cmd_lock); | |
aafc9d15 | 166 | iscsit_free_cmd(cmd, true); |
e48354ce NB |
167 | spin_lock(&cr->conn_recovery_cmd_lock); |
168 | } | |
169 | spin_unlock(&cr->conn_recovery_cmd_lock); | |
170 | spin_lock(&sess->cr_i_lock); | |
171 | ||
172 | kfree(cr); | |
173 | } | |
174 | spin_unlock(&sess->cr_i_lock); | |
175 | } | |
176 | ||
177 | int iscsit_remove_active_connection_recovery_entry( | |
178 | struct iscsi_conn_recovery *cr, | |
179 | struct iscsi_session *sess) | |
180 | { | |
181 | spin_lock(&sess->cr_a_lock); | |
182 | list_del(&cr->cr_list); | |
183 | ||
184 | sess->conn_recovery_count--; | |
185 | pr_debug("Decremented connection recovery count to %u for" | |
186 | " SID: %u\n", sess->conn_recovery_count, sess->sid); | |
187 | spin_unlock(&sess->cr_a_lock); | |
188 | ||
189 | kfree(cr); | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
fceb5bc7 | 194 | static void iscsit_remove_inactive_connection_recovery_entry( |
e48354ce NB |
195 | struct iscsi_conn_recovery *cr, |
196 | struct iscsi_session *sess) | |
197 | { | |
198 | spin_lock(&sess->cr_i_lock); | |
199 | list_del(&cr->cr_list); | |
200 | spin_unlock(&sess->cr_i_lock); | |
e48354ce NB |
201 | } |
202 | ||
203 | /* | |
204 | * Called with cr->conn_recovery_cmd_lock help. | |
205 | */ | |
206 | int iscsit_remove_cmd_from_connection_recovery( | |
207 | struct iscsi_cmd *cmd, | |
208 | struct iscsi_session *sess) | |
209 | { | |
210 | struct iscsi_conn_recovery *cr; | |
211 | ||
212 | if (!cmd->cr) { | |
213 | pr_err("struct iscsi_conn_recovery pointer for ITT: 0x%08x" | |
214 | " is NULL!\n", cmd->init_task_tag); | |
215 | BUG(); | |
216 | } | |
217 | cr = cmd->cr; | |
218 | ||
5159d763 | 219 | list_del_init(&cmd->i_conn_node); |
e48354ce NB |
220 | return --cr->cmd_count; |
221 | } | |
222 | ||
223 | void iscsit_discard_cr_cmds_by_expstatsn( | |
224 | struct iscsi_conn_recovery *cr, | |
225 | u32 exp_statsn) | |
226 | { | |
227 | u32 dropped_count = 0; | |
228 | struct iscsi_cmd *cmd, *cmd_tmp; | |
229 | struct iscsi_session *sess = cr->sess; | |
230 | ||
231 | spin_lock(&cr->conn_recovery_cmd_lock); | |
232 | list_for_each_entry_safe(cmd, cmd_tmp, | |
2fbb471e | 233 | &cr->conn_recovery_cmd_list, i_conn_node) { |
e48354ce NB |
234 | |
235 | if (((cmd->deferred_i_state != ISTATE_SENT_STATUS) && | |
236 | (cmd->deferred_i_state != ISTATE_REMOVE)) || | |
237 | (cmd->stat_sn >= exp_statsn)) { | |
238 | continue; | |
239 | } | |
240 | ||
241 | dropped_count++; | |
242 | pr_debug("Dropping Acknowledged ITT: 0x%08x, StatSN:" | |
243 | " 0x%08x, CID: %hu.\n", cmd->init_task_tag, | |
244 | cmd->stat_sn, cr->cid); | |
245 | ||
246 | iscsit_remove_cmd_from_connection_recovery(cmd, sess); | |
247 | ||
248 | spin_unlock(&cr->conn_recovery_cmd_lock); | |
aafc9d15 | 249 | iscsit_free_cmd(cmd, true); |
e48354ce NB |
250 | spin_lock(&cr->conn_recovery_cmd_lock); |
251 | } | |
252 | spin_unlock(&cr->conn_recovery_cmd_lock); | |
253 | ||
254 | pr_debug("Dropped %u total acknowledged commands on" | |
255 | " CID: %hu less than old ExpStatSN: 0x%08x\n", | |
256 | dropped_count, cr->cid, exp_statsn); | |
257 | ||
258 | if (!cr->cmd_count) { | |
259 | pr_debug("No commands to be reassigned for failed" | |
260 | " connection CID: %hu on SID: %u\n", | |
261 | cr->cid, sess->sid); | |
262 | iscsit_remove_inactive_connection_recovery_entry(cr, sess); | |
263 | iscsit_attach_active_connection_recovery_entry(sess, cr); | |
264 | pr_debug("iSCSI connection recovery successful for CID:" | |
265 | " %hu on SID: %u\n", cr->cid, sess->sid); | |
266 | iscsit_remove_active_connection_recovery_entry(cr, sess); | |
267 | } else { | |
268 | iscsit_remove_inactive_connection_recovery_entry(cr, sess); | |
269 | iscsit_attach_active_connection_recovery_entry(sess, cr); | |
270 | } | |
271 | } | |
272 | ||
273 | int iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(struct iscsi_conn *conn) | |
274 | { | |
275 | u32 dropped_count = 0; | |
276 | struct iscsi_cmd *cmd, *cmd_tmp; | |
277 | struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; | |
278 | struct iscsi_session *sess = conn->sess; | |
279 | ||
280 | mutex_lock(&sess->cmdsn_mutex); | |
281 | list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, | |
282 | &sess->sess_ooo_cmdsn_list, ooo_list) { | |
283 | ||
284 | if (ooo_cmdsn->cid != conn->cid) | |
285 | continue; | |
286 | ||
287 | dropped_count++; | |
288 | pr_debug("Dropping unacknowledged CmdSN:" | |
289 | " 0x%08x during connection recovery on CID: %hu\n", | |
290 | ooo_cmdsn->cmdsn, conn->cid); | |
291 | iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); | |
292 | } | |
293 | mutex_unlock(&sess->cmdsn_mutex); | |
294 | ||
295 | spin_lock_bh(&conn->cmd_lock); | |
2fbb471e | 296 | list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) { |
e48354ce NB |
297 | if (!(cmd->cmd_flags & ICF_OOO_CMDSN)) |
298 | continue; | |
299 | ||
5159d763 | 300 | list_del_init(&cmd->i_conn_node); |
e48354ce NB |
301 | |
302 | spin_unlock_bh(&conn->cmd_lock); | |
aafc9d15 | 303 | iscsit_free_cmd(cmd, true); |
e48354ce NB |
304 | spin_lock_bh(&conn->cmd_lock); |
305 | } | |
306 | spin_unlock_bh(&conn->cmd_lock); | |
307 | ||
308 | pr_debug("Dropped %u total unacknowledged commands on CID:" | |
309 | " %hu for ExpCmdSN: 0x%08x.\n", dropped_count, conn->cid, | |
310 | sess->exp_cmd_sn); | |
311 | return 0; | |
312 | } | |
313 | ||
314 | int iscsit_prepare_cmds_for_realligance(struct iscsi_conn *conn) | |
315 | { | |
316 | u32 cmd_count = 0; | |
317 | struct iscsi_cmd *cmd, *cmd_tmp; | |
318 | struct iscsi_conn_recovery *cr; | |
319 | ||
320 | /* | |
321 | * Allocate an struct iscsi_conn_recovery for this connection. | |
322 | * Each struct iscsi_cmd contains an struct iscsi_conn_recovery pointer | |
323 | * (struct iscsi_cmd->cr) so we need to allocate this before preparing the | |
324 | * connection's command list for connection recovery. | |
325 | */ | |
326 | cr = kzalloc(sizeof(struct iscsi_conn_recovery), GFP_KERNEL); | |
327 | if (!cr) { | |
328 | pr_err("Unable to allocate memory for" | |
329 | " struct iscsi_conn_recovery.\n"); | |
330 | return -1; | |
331 | } | |
332 | INIT_LIST_HEAD(&cr->cr_list); | |
333 | INIT_LIST_HEAD(&cr->conn_recovery_cmd_list); | |
334 | spin_lock_init(&cr->conn_recovery_cmd_lock); | |
335 | /* | |
336 | * Only perform connection recovery on ISCSI_OP_SCSI_CMD or | |
337 | * ISCSI_OP_NOOP_OUT opcodes. For all other opcodes call | |
5159d763 | 338 | * list_del_init(&cmd->i_conn_node); to release the command to the |
e48354ce NB |
339 | * session pool and remove it from the connection's list. |
340 | * | |
341 | * Also stop the DataOUT timer, which will be restarted after | |
342 | * sending the TMR response. | |
343 | */ | |
344 | spin_lock_bh(&conn->cmd_lock); | |
2fbb471e | 345 | list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) { |
e48354ce NB |
346 | |
347 | if ((cmd->iscsi_opcode != ISCSI_OP_SCSI_CMD) && | |
348 | (cmd->iscsi_opcode != ISCSI_OP_NOOP_OUT)) { | |
349 | pr_debug("Not performing realligence on" | |
350 | " Opcode: 0x%02x, ITT: 0x%08x, CmdSN: 0x%08x," | |
351 | " CID: %hu\n", cmd->iscsi_opcode, | |
352 | cmd->init_task_tag, cmd->cmd_sn, conn->cid); | |
353 | ||
5159d763 | 354 | list_del_init(&cmd->i_conn_node); |
e48354ce | 355 | spin_unlock_bh(&conn->cmd_lock); |
aafc9d15 | 356 | iscsit_free_cmd(cmd, true); |
e48354ce NB |
357 | spin_lock_bh(&conn->cmd_lock); |
358 | continue; | |
359 | } | |
360 | ||
361 | /* | |
362 | * Special case where commands greater than or equal to | |
363 | * the session's ExpCmdSN are attached to the connection | |
364 | * list but not to the out of order CmdSN list. The one | |
365 | * obvious case is when a command with immediate data | |
366 | * attached must only check the CmdSN against ExpCmdSN | |
367 | * after the data is received. The special case below | |
368 | * is when the connection fails before data is received, | |
369 | * but also may apply to other PDUs, so it has been | |
370 | * made generic here. | |
371 | */ | |
372 | if (!(cmd->cmd_flags & ICF_OOO_CMDSN) && !cmd->immediate_cmd && | |
64fe4f4f | 373 | iscsi_sna_gte(cmd->cmd_sn, conn->sess->exp_cmd_sn)) { |
5159d763 | 374 | list_del_init(&cmd->i_conn_node); |
e48354ce | 375 | spin_unlock_bh(&conn->cmd_lock); |
aafc9d15 | 376 | iscsit_free_cmd(cmd, true); |
e48354ce NB |
377 | spin_lock_bh(&conn->cmd_lock); |
378 | continue; | |
379 | } | |
380 | ||
381 | cmd_count++; | |
382 | pr_debug("Preparing Opcode: 0x%02x, ITT: 0x%08x," | |
383 | " CmdSN: 0x%08x, StatSN: 0x%08x, CID: %hu for" | |
384 | " realligence.\n", cmd->iscsi_opcode, | |
385 | cmd->init_task_tag, cmd->cmd_sn, cmd->stat_sn, | |
386 | conn->cid); | |
387 | ||
388 | cmd->deferred_i_state = cmd->i_state; | |
389 | cmd->i_state = ISTATE_IN_CONNECTION_RECOVERY; | |
390 | ||
391 | if (cmd->data_direction == DMA_TO_DEVICE) | |
392 | iscsit_stop_dataout_timer(cmd); | |
393 | ||
394 | cmd->sess = conn->sess; | |
395 | ||
5159d763 | 396 | list_del_init(&cmd->i_conn_node); |
e48354ce NB |
397 | spin_unlock_bh(&conn->cmd_lock); |
398 | ||
399 | iscsit_free_all_datain_reqs(cmd); | |
400 | ||
d270190a | 401 | transport_wait_for_tasks(&cmd->se_cmd); |
e48354ce NB |
402 | /* |
403 | * Add the struct iscsi_cmd to the connection recovery cmd list | |
404 | */ | |
405 | spin_lock(&cr->conn_recovery_cmd_lock); | |
2fbb471e | 406 | list_add_tail(&cmd->i_conn_node, &cr->conn_recovery_cmd_list); |
e48354ce NB |
407 | spin_unlock(&cr->conn_recovery_cmd_lock); |
408 | ||
409 | spin_lock_bh(&conn->cmd_lock); | |
410 | cmd->cr = cr; | |
411 | cmd->conn = NULL; | |
412 | } | |
413 | spin_unlock_bh(&conn->cmd_lock); | |
414 | /* | |
415 | * Fill in the various values in the preallocated struct iscsi_conn_recovery. | |
416 | */ | |
417 | cr->cid = conn->cid; | |
418 | cr->cmd_count = cmd_count; | |
419 | cr->maxrecvdatasegmentlength = conn->conn_ops->MaxRecvDataSegmentLength; | |
1c417f39 | 420 | cr->maxxmitdatasegmentlength = conn->conn_ops->MaxXmitDataSegmentLength; |
e48354ce NB |
421 | cr->sess = conn->sess; |
422 | ||
423 | iscsit_attach_inactive_connection_recovery_entry(conn->sess, cr); | |
424 | ||
425 | return 0; | |
426 | } | |
427 | ||
428 | int iscsit_connection_recovery_transport_reset(struct iscsi_conn *conn) | |
429 | { | |
430 | atomic_set(&conn->connection_recovery, 1); | |
431 | ||
432 | if (iscsit_close_connection(conn) < 0) | |
433 | return -1; | |
434 | ||
435 | return 0; | |
436 | } |