1 /*******************************************************************************
2  * This file contains the main functions related to Initiator Node Attributes.
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 <target/target_core_base.h>
22 
23 #include "iscsi_target_core.h"
24 #include "iscsi_target_device.h"
25 #include "iscsi_target_tpg.h"
26 #include "iscsi_target_util.h"
27 #include "iscsi_target_nodeattrib.h"
28 
29 static inline char *iscsit_na_get_initiatorname(
30 	struct iscsi_node_acl *nacl)
31 {
32 	struct se_node_acl *se_nacl = &nacl->se_node_acl;
33 
34 	return &se_nacl->initiatorname[0];
35 }
36 
37 void iscsit_set_default_node_attribues(
38 	struct iscsi_node_acl *acl)
39 {
40 	struct iscsi_node_attrib *a = &acl->node_attrib;
41 
42 	a->dataout_timeout = NA_DATAOUT_TIMEOUT;
43 	a->dataout_timeout_retries = NA_DATAOUT_TIMEOUT_RETRIES;
44 	a->nopin_timeout = NA_NOPIN_TIMEOUT;
45 	a->nopin_response_timeout = NA_NOPIN_RESPONSE_TIMEOUT;
46 	a->random_datain_pdu_offsets = NA_RANDOM_DATAIN_PDU_OFFSETS;
47 	a->random_datain_seq_offsets = NA_RANDOM_DATAIN_SEQ_OFFSETS;
48 	a->random_r2t_offsets = NA_RANDOM_R2T_OFFSETS;
49 	a->default_erl = NA_DEFAULT_ERL;
50 }
51 
52 int iscsit_na_dataout_timeout(
53 	struct iscsi_node_acl *acl,
54 	u32 dataout_timeout)
55 {
56 	struct iscsi_node_attrib *a = &acl->node_attrib;
57 
58 	if (dataout_timeout > NA_DATAOUT_TIMEOUT_MAX) {
59 		pr_err("Requested DataOut Timeout %u larger than"
60 			" maximum %u\n", dataout_timeout,
61 			NA_DATAOUT_TIMEOUT_MAX);
62 		return -EINVAL;
63 	} else if (dataout_timeout < NA_DATAOUT_TIMEOUT_MIX) {
64 		pr_err("Requested DataOut Timeout %u smaller than"
65 			" minimum %u\n", dataout_timeout,
66 			NA_DATAOUT_TIMEOUT_MIX);
67 		return -EINVAL;
68 	}
69 
70 	a->dataout_timeout = dataout_timeout;
71 	pr_debug("Set DataOut Timeout to %u for Initiator Node"
72 		" %s\n", a->dataout_timeout, iscsit_na_get_initiatorname(acl));
73 
74 	return 0;
75 }
76 
77 int iscsit_na_dataout_timeout_retries(
78 	struct iscsi_node_acl *acl,
79 	u32 dataout_timeout_retries)
80 {
81 	struct iscsi_node_attrib *a = &acl->node_attrib;
82 
83 	if (dataout_timeout_retries > NA_DATAOUT_TIMEOUT_RETRIES_MAX) {
84 		pr_err("Requested DataOut Timeout Retries %u larger"
85 			" than maximum %u", dataout_timeout_retries,
86 				NA_DATAOUT_TIMEOUT_RETRIES_MAX);
87 		return -EINVAL;
88 	} else if (dataout_timeout_retries < NA_DATAOUT_TIMEOUT_RETRIES_MIN) {
89 		pr_err("Requested DataOut Timeout Retries %u smaller"
90 			" than minimum %u", dataout_timeout_retries,
91 				NA_DATAOUT_TIMEOUT_RETRIES_MIN);
92 		return -EINVAL;
93 	}
94 
95 	a->dataout_timeout_retries = dataout_timeout_retries;
96 	pr_debug("Set DataOut Timeout Retries to %u for"
97 		" Initiator Node %s\n", a->dataout_timeout_retries,
98 		iscsit_na_get_initiatorname(acl));
99 
100 	return 0;
101 }
102 
103 int iscsit_na_nopin_timeout(
104 	struct iscsi_node_acl *acl,
105 	u32 nopin_timeout)
106 {
107 	struct iscsi_node_attrib *a = &acl->node_attrib;
108 	struct iscsi_session *sess;
109 	struct iscsi_conn *conn;
110 	struct se_node_acl *se_nacl = &a->nacl->se_node_acl;
111 	struct se_session *se_sess;
112 	u32 orig_nopin_timeout = a->nopin_timeout;
113 
114 	if (nopin_timeout > NA_NOPIN_TIMEOUT_MAX) {
115 		pr_err("Requested NopIn Timeout %u larger than maximum"
116 			" %u\n", nopin_timeout, NA_NOPIN_TIMEOUT_MAX);
117 		return -EINVAL;
118 	} else if ((nopin_timeout < NA_NOPIN_TIMEOUT_MIN) &&
119 		   (nopin_timeout != 0)) {
120 		pr_err("Requested NopIn Timeout %u smaller than"
121 			" minimum %u and not 0\n", nopin_timeout,
122 			NA_NOPIN_TIMEOUT_MIN);
123 		return -EINVAL;
124 	}
125 
126 	a->nopin_timeout = nopin_timeout;
127 	pr_debug("Set NopIn Timeout to %u for Initiator"
128 		" Node %s\n", a->nopin_timeout,
129 		iscsit_na_get_initiatorname(acl));
130 	/*
131 	 * Reenable disabled nopin_timeout timer for all iSCSI connections.
132 	 */
133 	if (!orig_nopin_timeout) {
134 		spin_lock_bh(&se_nacl->nacl_sess_lock);
135 		se_sess = se_nacl->nacl_sess;
136 		if (se_sess) {
137 			sess = se_sess->fabric_sess_ptr;
138 
139 			spin_lock(&sess->conn_lock);
140 			list_for_each_entry(conn, &sess->sess_conn_list,
141 					conn_list) {
142 				if (conn->conn_state !=
143 						TARG_CONN_STATE_LOGGED_IN)
144 					continue;
145 
146 				spin_lock(&conn->nopin_timer_lock);
147 				__iscsit_start_nopin_timer(conn);
148 				spin_unlock(&conn->nopin_timer_lock);
149 			}
150 			spin_unlock(&sess->conn_lock);
151 		}
152 		spin_unlock_bh(&se_nacl->nacl_sess_lock);
153 	}
154 
155 	return 0;
156 }
157 
158 int iscsit_na_nopin_response_timeout(
159 	struct iscsi_node_acl *acl,
160 	u32 nopin_response_timeout)
161 {
162 	struct iscsi_node_attrib *a = &acl->node_attrib;
163 
164 	if (nopin_response_timeout > NA_NOPIN_RESPONSE_TIMEOUT_MAX) {
165 		pr_err("Requested NopIn Response Timeout %u larger"
166 			" than maximum %u\n", nopin_response_timeout,
167 				NA_NOPIN_RESPONSE_TIMEOUT_MAX);
168 		return -EINVAL;
169 	} else if (nopin_response_timeout < NA_NOPIN_RESPONSE_TIMEOUT_MIN) {
170 		pr_err("Requested NopIn Response Timeout %u smaller"
171 			" than minimum %u\n", nopin_response_timeout,
172 				NA_NOPIN_RESPONSE_TIMEOUT_MIN);
173 		return -EINVAL;
174 	}
175 
176 	a->nopin_response_timeout = nopin_response_timeout;
177 	pr_debug("Set NopIn Response Timeout to %u for"
178 		" Initiator Node %s\n", a->nopin_timeout,
179 		iscsit_na_get_initiatorname(acl));
180 
181 	return 0;
182 }
183 
184 int iscsit_na_random_datain_pdu_offsets(
185 	struct iscsi_node_acl *acl,
186 	u32 random_datain_pdu_offsets)
187 {
188 	struct iscsi_node_attrib *a = &acl->node_attrib;
189 
190 	if (random_datain_pdu_offsets != 0 && random_datain_pdu_offsets != 1) {
191 		pr_err("Requested Random DataIN PDU Offsets: %u not"
192 			" 0 or 1\n", random_datain_pdu_offsets);
193 		return -EINVAL;
194 	}
195 
196 	a->random_datain_pdu_offsets = random_datain_pdu_offsets;
197 	pr_debug("Set Random DataIN PDU Offsets to %u for"
198 		" Initiator Node %s\n", a->random_datain_pdu_offsets,
199 		iscsit_na_get_initiatorname(acl));
200 
201 	return 0;
202 }
203 
204 int iscsit_na_random_datain_seq_offsets(
205 	struct iscsi_node_acl *acl,
206 	u32 random_datain_seq_offsets)
207 {
208 	struct iscsi_node_attrib *a = &acl->node_attrib;
209 
210 	if (random_datain_seq_offsets != 0 && random_datain_seq_offsets != 1) {
211 		pr_err("Requested Random DataIN Sequence Offsets: %u"
212 			" not 0 or 1\n", random_datain_seq_offsets);
213 		return -EINVAL;
214 	}
215 
216 	a->random_datain_seq_offsets = random_datain_seq_offsets;
217 	pr_debug("Set Random DataIN Sequence Offsets to %u for"
218 		" Initiator Node %s\n", a->random_datain_seq_offsets,
219 		iscsit_na_get_initiatorname(acl));
220 
221 	return 0;
222 }
223 
224 int iscsit_na_random_r2t_offsets(
225 	struct iscsi_node_acl *acl,
226 	u32 random_r2t_offsets)
227 {
228 	struct iscsi_node_attrib *a = &acl->node_attrib;
229 
230 	if (random_r2t_offsets != 0 && random_r2t_offsets != 1) {
231 		pr_err("Requested Random R2T Offsets: %u not"
232 			" 0 or 1\n", random_r2t_offsets);
233 		return -EINVAL;
234 	}
235 
236 	a->random_r2t_offsets = random_r2t_offsets;
237 	pr_debug("Set Random R2T Offsets to %u for"
238 		" Initiator Node %s\n", a->random_r2t_offsets,
239 		iscsit_na_get_initiatorname(acl));
240 
241 	return 0;
242 }
243 
244 int iscsit_na_default_erl(
245 	struct iscsi_node_acl *acl,
246 	u32 default_erl)
247 {
248 	struct iscsi_node_attrib *a = &acl->node_attrib;
249 
250 	if (default_erl != 0 && default_erl != 1 && default_erl != 2) {
251 		pr_err("Requested default ERL: %u not 0, 1, or 2\n",
252 				default_erl);
253 		return -EINVAL;
254 	}
255 
256 	a->default_erl = default_erl;
257 	pr_debug("Set use ERL0 flag to %u for Initiator"
258 		" Node %s\n", a->default_erl,
259 		iscsit_na_get_initiatorname(acl));
260 
261 	return 0;
262 }
263