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1 /*
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2 * CDDL HEADER START
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3 *
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4 * The contents of this file are subject to the terms of the
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5 * Common Development and Distribution License (the "License").
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6 * You may not use this file except in compliance with the License.
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7 *
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8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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9 * or http://www.opensolaris.org/os/licensing.
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10 * See the License for the specific language governing permissions
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11 * and limitations under the License.
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12 *
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13 * When distributing Covered Code, include this CDDL HEADER in each
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14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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15 * If applicable, add the following below this CDDL HEADER, with the
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16 * fields enclosed by brackets "[]" replaced with your own identifying
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17 * information: Portions Copyright [yyyy] [name of copyright owner]
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18 *
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19 * CDDL HEADER END
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20 */
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21
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22 /*
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23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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24 * Use is subject to license terms.
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25 */
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26
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27 #ifndef _TARGET_CONN_H
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28 #define _TARGET_CONN_H
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29
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30 #pragma ident "@(#)iscsi_conn.h 1.1 06/06/20 SMI"
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31
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32 /*
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33 * Block comment which describes the contents of this file.
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34 */
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35
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36 #ifdef __cplusplus
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37 extern "C" {
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38 #endif
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39
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40 #include <sys/iscsi_protocol.h>
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41 #include <sys/socket.h>
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42 #include "queue.h"
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43 #include "iscsi_sess.h"
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44 #include "iscsi_cmd.h"
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45
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46 #define LBUFSIZE 80
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47
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48 #define TARGET_LOCATION "targets"
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49 /*
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50 * Currently I'm having some problems with network reads/write when the
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51 * data size is larger than 8k. To work around this problem I set the
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52 * various negotiation parameters during login to limit things to 8k.
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53 */
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54
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55 #define NETWORK_SNDRCV 65536
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56 #define NETWORK_SNDRCV_STR "65536"
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57
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58 typedef enum iscsi_state {
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59 S1_FREE,
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60 /* S2_XPT_WAIT, Not possible for target */
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61 S3_XPT_UP,
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62 S4_IN_LOGIN,
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63 S5_LOGGED_IN,
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64 S6_IN_LOGOUT,
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65 S7_LOGOUT_REQUESTED,
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66 S8_CLEANUP_WAIT
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67 } iscsi_state_t;
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68
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69 typedef enum iscsi_transition {
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70 T3, T4, T5, T6, T7, T8,
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71 T9, T10, T11, T12, T13, T15,
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72 T16, T17, T18
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73 } iscsi_transition_t;
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74
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75 /*
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76 * When grabbing mutex's make sure to grab c_mutex before c_mutex_state
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77 * if you need to grab both.
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78 */
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79 typedef struct iscsi_conn {
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80 int c_fd;
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81
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82 /*
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83 * This is a linked list of all connections. Not just the connections
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84 * associated with a particular session.
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85 */
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86 struct iscsi_conn *c_next,
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87 *c_prev;
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88
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89 target_queue_t *c_mgmtq;
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90
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91 /*
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92 * Time as reported by time(2) when this connection was started.
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93 */
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94 time_t c_up_at;
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95
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96 /*
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97 * This queue is used to accept notification that incoming packets
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98 * are available and command completion status from Session.
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99 */
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100 target_queue_t *c_dataq;
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101
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102 /*
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103 * Messages are sent to Session, and from there onto STE, using
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104 * this queue.
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105 */
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106 target_queue_t *c_sessq;
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107
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108 iscsi_sess_t *c_sess;
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109
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110 pthread_mutex_t c_state_mutex;
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111 iscsi_state_t c_state;
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112
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113 /*
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114 * Protected by c_mutex
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115 */
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116 int c_statsn;
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117
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118 int c_cid;
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119
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120 /*
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121 * Pointer to data buffer used to store text messages which have
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122 * the 'C' bit set. Since the text data separates name/value pairs
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123 * with a '\0' strlen can't be used to determine the amount of space
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124 * used so we keep the length in c_text_len;
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125 */
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126 char *c_text_area;
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127 int c_text_len;
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128 int c_text_sent;
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129
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130 sema_t c_datain;
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131 pthread_t c_thr_id_poller,
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132 c_thr_id_process;
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133
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134 pthread_mutex_t c_mutex;
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135 iscsi_cmd_t *c_cmd_head;
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136 iscsi_cmd_t *c_cmd_tail;
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137
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138 struct sockaddr_storage c_initiator_sockaddr;
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139 struct sockaddr_storage c_target_sockaddr;
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140
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141 int c_num;
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142
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143 int c_auth_pass : 1;
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144
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145 int c_cmds_active;
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146
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147 /*
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148 * A performance issue has been found when the backing store
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149 * is UFS. Because of the indirect blocks used by UFS large files
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150 * (many GBs in size) perform poorly. This in turn can cause the
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151 * initiator to issue commands which don't complete in time. So,
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152 * we'll monitor the completion times for commands if if it's
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153 * increasing the command window will be reduced.
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154 * The avg_sum is in nanoseconds. This will wrap once every 584
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155 * years.
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156 */
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157 uint64_t c_cmds_avg_cnt;
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158 hrtime_t c_cmds_avg_sum;
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159
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160 /*
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161 * During an orderly shutdown the logout response is created when
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162 * we receive the logout request. We must however wait for all I/O
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163 * to complete before processing the data else we'll loose data
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164 * which the initiator believes was successfully transferred.
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165 * Once the STE and sessions have closed they will send a shutdown
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166 * complete message. At that point the transmit side of the connection
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167 * will set the state to T13 which pushes this message out.
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168 * Unfortunately we need information from the Logout Request PDU
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169 * to create the Logout Response PDU. Otherwise the response could
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170 * be generated on the fly in the T13 state handler. By creating
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171 * the response PDU and saving a pointer gives us some flexibility
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172 * in the future if the final outgoing packet needs to change.
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173 * Otherwise, storing that one bit of information from the request
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174 * PDU might become dated.
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175 */
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176 iscsi_hdr_t *c_last_pkg;
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177
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178 /*
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179 * Connection parameters
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180 */
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181 Boolean_t c_header_digest,
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182 c_data_digest,
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183 c_ifmarker,
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184 c_ofmarker,
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185 c_initialR2T,
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186 c_immediate_data,
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187 c_data_pdu_in_order,
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188 c_data_sequence_in_order;
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189 int c_tpgt,
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190 c_maxcmdsn,
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191 c_max_recv_data,
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192 c_default_time_2_wait,
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193 c_default_time_2_retain,
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194 c_erl,
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195 c_max_burst_len,
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196 c_first_burst_len,
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197 c_max_outstanding_r2t,
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198 c_max_connections;
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199 char *c_targ_alias,
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200 *auth_text;
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201 int auth_text_length;
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202
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203 } iscsi_conn_t;
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204
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205 void *conn_process(void *v);
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206 void conn_state(iscsi_conn_t *c, iscsi_transition_t t);
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207 void send_iscsi_pkt(iscsi_conn_t *c, iscsi_hdr_t *h, char *opt_text);
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208 int read_retry(int fd, char *buf, int count);
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209 void iscsi_inventory_change(char *targ_name);
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210 void iscsi_capacity_change(char *targ_name, int lun);
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211
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212 #ifdef __cplusplus
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213 }
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214 #endif
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215
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216 #endif /* _TARGET_CONN_H */
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