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88455ec4 CH |
1 | /* |
2 | * SCSI Primary Commands (SPC) parsing and emulation. | |
3 | * | |
4 | * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. | |
5 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. | |
6 | * Copyright (c) 2007-2010 Rising Tide Systems | |
7 | * Copyright (c) 2008-2010 Linux-iSCSI.org | |
8 | * | |
9 | * Nicholas A. Bellinger <nab@kernel.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 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/module.h> | |
28 | #include <asm/unaligned.h> | |
29 | ||
30 | #include <scsi/scsi.h> | |
31 | #include <scsi/scsi_tcq.h> | |
32 | ||
33 | #include <target/target_core_base.h> | |
34 | #include <target/target_core_backend.h> | |
35 | #include <target/target_core_fabric.h> | |
36 | ||
37 | #include "target_core_internal.h" | |
38 | #include "target_core_pr.h" | |
39 | #include "target_core_ua.h" | |
40 | ||
41 | ||
42 | int spc_parse_cdb(struct se_cmd *cmd, unsigned int *size, bool passthrough) | |
43 | { | |
44 | struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; | |
45 | unsigned char *cdb = cmd->t_task_cdb; | |
46 | ||
47 | switch (cdb[0]) { | |
48 | case MODE_SELECT: | |
49 | *size = cdb[4]; | |
50 | break; | |
51 | case MODE_SELECT_10: | |
52 | *size = (cdb[7] << 8) + cdb[8]; | |
53 | break; | |
54 | case MODE_SENSE: | |
55 | *size = cdb[4]; | |
56 | if (!passthrough) | |
57 | cmd->execute_cmd = target_emulate_modesense; | |
58 | break; | |
59 | case MODE_SENSE_10: | |
60 | *size = (cdb[7] << 8) + cdb[8]; | |
61 | if (!passthrough) | |
62 | cmd->execute_cmd = target_emulate_modesense; | |
63 | break; | |
64 | case LOG_SELECT: | |
65 | case LOG_SENSE: | |
66 | *size = (cdb[7] << 8) + cdb[8]; | |
67 | break; | |
68 | case PERSISTENT_RESERVE_IN: | |
69 | if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS) | |
70 | cmd->execute_cmd = target_scsi3_emulate_pr_in; | |
71 | *size = (cdb[7] << 8) + cdb[8]; | |
72 | break; | |
73 | case PERSISTENT_RESERVE_OUT: | |
74 | if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS) | |
75 | cmd->execute_cmd = target_scsi3_emulate_pr_out; | |
76 | *size = (cdb[7] << 8) + cdb[8]; | |
77 | break; | |
78 | case RELEASE: | |
79 | case RELEASE_10: | |
80 | if (cdb[0] == RELEASE_10) | |
81 | *size = (cdb[7] << 8) | cdb[8]; | |
82 | else | |
83 | *size = cmd->data_length; | |
84 | ||
85 | if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) | |
86 | cmd->execute_cmd = target_scsi2_reservation_release; | |
87 | break; | |
88 | case RESERVE: | |
89 | case RESERVE_10: | |
90 | /* | |
91 | * The SPC-2 RESERVE does not contain a size in the SCSI CDB. | |
92 | * Assume the passthrough or $FABRIC_MOD will tell us about it. | |
93 | */ | |
94 | if (cdb[0] == RESERVE_10) | |
95 | *size = (cdb[7] << 8) | cdb[8]; | |
96 | else | |
97 | *size = cmd->data_length; | |
98 | ||
99 | /* | |
100 | * Setup the legacy emulated handler for SPC-2 and | |
101 | * >= SPC-3 compatible reservation handling (CRH=1) | |
102 | * Otherwise, we assume the underlying SCSI logic is | |
103 | * is running in SPC_PASSTHROUGH, and wants reservations | |
104 | * emulation disabled. | |
105 | */ | |
106 | if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) | |
107 | cmd->execute_cmd = target_scsi2_reservation_reserve; | |
108 | break; | |
109 | case REQUEST_SENSE: | |
110 | *size = cdb[4]; | |
111 | if (!passthrough) | |
112 | cmd->execute_cmd = target_emulate_request_sense; | |
113 | break; | |
114 | case INQUIRY: | |
115 | *size = (cdb[3] << 8) + cdb[4]; | |
116 | ||
117 | /* | |
118 | * Do implict HEAD_OF_QUEUE processing for INQUIRY. | |
119 | * See spc4r17 section 5.3 | |
120 | */ | |
121 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) | |
122 | cmd->sam_task_attr = MSG_HEAD_TAG; | |
123 | if (!passthrough) | |
124 | cmd->execute_cmd = target_emulate_inquiry; | |
125 | break; | |
126 | case SECURITY_PROTOCOL_IN: | |
127 | case SECURITY_PROTOCOL_OUT: | |
128 | *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
129 | break; | |
130 | case EXTENDED_COPY: | |
131 | case READ_ATTRIBUTE: | |
132 | case RECEIVE_COPY_RESULTS: | |
133 | case WRITE_ATTRIBUTE: | |
134 | *size = (cdb[10] << 24) | (cdb[11] << 16) | | |
135 | (cdb[12] << 8) | cdb[13]; | |
136 | break; | |
137 | case RECEIVE_DIAGNOSTIC: | |
138 | case SEND_DIAGNOSTIC: | |
139 | *size = (cdb[3] << 8) | cdb[4]; | |
140 | break; | |
141 | case WRITE_BUFFER: | |
142 | *size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | |
143 | break; | |
144 | case REPORT_LUNS: | |
145 | cmd->execute_cmd = target_report_luns; | |
146 | *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
147 | /* | |
148 | * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS | |
149 | * See spc4r17 section 5.3 | |
150 | */ | |
151 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) | |
152 | cmd->sam_task_attr = MSG_HEAD_TAG; | |
153 | break; | |
154 | case TEST_UNIT_READY: | |
d6e0175c | 155 | *size = 0; |
88455ec4 CH |
156 | if (!passthrough) |
157 | cmd->execute_cmd = target_emulate_noop; | |
158 | break; | |
159 | default: | |
160 | pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode" | |
161 | " 0x%02x, sending CHECK_CONDITION.\n", | |
162 | cmd->se_tfo->get_fabric_name(), cdb[0]); | |
163 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
164 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
165 | return -EINVAL; | |
166 | } | |
167 | ||
168 | return 0; | |
169 | } | |
170 | EXPORT_SYMBOL(spc_parse_cdb); |