1 | /* |
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2 | * Copyright (C) 2009 Fen Systems Ltd <mbrown@fensystems.co.uk>. |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in |
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14 | * the documentation and/or other materials provided with the |
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15 | * distribution. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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18 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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19 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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20 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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21 | * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
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22 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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23 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
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24 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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26 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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28 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
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29 | */ |
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30 | |
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31 | FILE_LICENCE ( BSD2 ); |
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32 | |
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33 | #include <stdlib.h> |
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34 | #include <errno.h> |
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35 | #include <gpxe/srp.h> |
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36 | #include <gpxe/infiniband.h> |
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37 | #include <gpxe/ib_cmrc.h> |
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38 | #include <gpxe/ib_srp.h> |
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39 | |
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40 | /** |
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41 | * @file |
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42 | * |
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43 | * SCSI RDMA Protocol over Infiniband |
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44 | * |
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45 | */ |
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46 | |
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47 | /* Disambiguate the various possible EINVALs */ |
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48 | #define EINVAL_BYTE_STRING_LEN ( EINVAL | EUNIQ_01 ) |
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49 | #define EINVAL_BYTE_STRING ( EINVAL | EUNIQ_02 ) |
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50 | #define EINVAL_INTEGER ( EINVAL | EUNIQ_03 ) |
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51 | #define EINVAL_RP_TOO_SHORT ( EINVAL | EUNIQ_04 ) |
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52 | |
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53 | /** IB SRP parse flags */ |
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54 | enum ib_srp_parse_flags { |
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55 | IB_SRP_PARSE_REQUIRED = 0x0000, |
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56 | IB_SRP_PARSE_OPTIONAL = 0x8000, |
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57 | IB_SRP_PARSE_FLAG_MASK = 0xf000, |
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58 | }; |
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59 | |
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60 | /** IB SRP root path parameters */ |
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61 | struct ib_srp_root_path { |
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62 | /** SCSI LUN */ |
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63 | struct scsi_lun *lun; |
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64 | /** SRP port IDs */ |
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65 | struct srp_port_ids *port_ids; |
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66 | /** IB SRP parameters */ |
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67 | struct ib_srp_parameters *ib; |
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68 | }; |
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69 | |
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70 | /** |
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71 | * Parse IB SRP root path byte-string value |
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72 | * |
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73 | * @v rp_comp Root path component string |
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74 | * @v default_value Default value to use if component string is empty |
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75 | * @ret value Value |
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76 | */ |
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77 | static int ib_srp_parse_byte_string ( const char *rp_comp, uint8_t *bytes, |
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78 | unsigned int size_flags ) { |
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79 | size_t size = ( size_flags & ~IB_SRP_PARSE_FLAG_MASK ); |
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80 | size_t rp_comp_len = strlen ( rp_comp ); |
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81 | char buf[3]; |
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82 | char *buf_end; |
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83 | |
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84 | /* Allow optional components to be empty */ |
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85 | if ( ( rp_comp_len == 0 ) && |
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86 | ( size_flags & IB_SRP_PARSE_OPTIONAL ) ) |
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87 | return 0; |
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88 | |
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89 | /* Check string length */ |
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90 | if ( rp_comp_len != ( 2 * size ) ) |
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91 | return -EINVAL_BYTE_STRING_LEN; |
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92 | |
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93 | /* Parse byte string */ |
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94 | for ( ; size ; size--, rp_comp += 2, bytes++ ) { |
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95 | memcpy ( buf, rp_comp, 2 ); |
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96 | buf[2] = '\0'; |
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97 | *bytes = strtoul ( buf, &buf_end, 16 ); |
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98 | if ( buf_end != &buf[2] ) |
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99 | return -EINVAL_BYTE_STRING; |
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100 | } |
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101 | return 0; |
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102 | } |
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103 | |
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104 | /** |
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105 | * Parse IB SRP root path integer value |
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106 | * |
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107 | * @v rp_comp Root path component string |
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108 | * @v default_value Default value to use if component string is empty |
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109 | * @ret value Value |
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110 | */ |
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111 | static int ib_srp_parse_integer ( const char *rp_comp, int default_value ) { |
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112 | int value; |
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113 | char *end; |
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114 | |
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115 | value = strtoul ( rp_comp, &end, 16 ); |
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116 | if ( *end ) |
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117 | return -EINVAL_INTEGER; |
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118 | |
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119 | if ( end == rp_comp ) |
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120 | return default_value; |
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121 | |
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122 | return value; |
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123 | } |
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124 | |
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125 | /** |
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126 | * Parse IB SRP root path literal component |
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127 | * |
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128 | * @v rp_comp Root path component string |
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129 | * @v rp IB SRP root path |
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130 | * @ret rc Return status code |
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131 | */ |
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132 | static int ib_srp_parse_literal ( const char *rp_comp __unused, |
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133 | struct ib_srp_root_path *rp __unused ) { |
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134 | /* Ignore */ |
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135 | return 0; |
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136 | } |
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137 | |
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138 | /** |
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139 | * Parse IB SRP root path source GID |
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140 | * |
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141 | * @v rp_comp Root path component string |
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142 | * @v rp IB SRP root path |
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143 | * @ret rc Return status code |
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144 | */ |
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145 | static int ib_srp_parse_sgid ( const char *rp_comp, |
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146 | struct ib_srp_root_path *rp ) { |
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147 | struct ib_device *ibdev; |
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148 | |
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149 | /* Default to the GID of the last opened Infiniband device */ |
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150 | if ( ( ibdev = last_opened_ibdev() ) != NULL ) |
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151 | memcpy ( &rp->ib->sgid, &ibdev->gid, sizeof ( rp->ib->sgid ) ); |
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152 | |
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153 | return ib_srp_parse_byte_string ( rp_comp, rp->ib->sgid.u.bytes, |
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154 | ( sizeof ( rp->ib->sgid ) | |
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155 | IB_SRP_PARSE_OPTIONAL ) ); |
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156 | } |
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157 | |
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158 | /** |
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159 | * Parse IB SRP root path initiator identifier extension |
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160 | * |
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161 | * @v rp_comp Root path component string |
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162 | * @v rp IB SRP root path |
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163 | * @ret rc Return status code |
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164 | */ |
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165 | static int ib_srp_parse_initiator_id_ext ( const char *rp_comp, |
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166 | struct ib_srp_root_path *rp ) { |
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167 | struct ib_srp_initiator_port_id *port_id = |
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168 | ib_srp_initiator_port_id ( rp->port_ids ); |
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169 | |
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170 | return ib_srp_parse_byte_string ( rp_comp, port_id->id_ext.u.bytes, |
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171 | ( sizeof ( port_id->id_ext ) | |
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172 | IB_SRP_PARSE_OPTIONAL ) ); |
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173 | } |
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174 | |
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175 | /** |
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176 | * Parse IB SRP root path initiator HCA GUID |
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177 | * |
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178 | * @v rp_comp Root path component string |
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179 | * @v rp IB SRP root path |
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180 | * @ret rc Return status code |
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181 | */ |
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182 | static int ib_srp_parse_initiator_hca_guid ( const char *rp_comp, |
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183 | struct ib_srp_root_path *rp ) { |
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184 | struct ib_srp_initiator_port_id *port_id = |
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185 | ib_srp_initiator_port_id ( rp->port_ids ); |
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186 | |
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187 | /* Default to the GUID portion of the source GID */ |
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188 | memcpy ( &port_id->hca_guid, &rp->ib->sgid.u.half[1], |
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189 | sizeof ( port_id->hca_guid ) ); |
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190 | |
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191 | return ib_srp_parse_byte_string ( rp_comp, port_id->hca_guid.u.bytes, |
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192 | ( sizeof ( port_id->hca_guid ) | |
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193 | IB_SRP_PARSE_OPTIONAL ) ); |
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194 | } |
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195 | |
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196 | /** |
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197 | * Parse IB SRP root path destination GID |
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198 | * |
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199 | * @v rp_comp Root path component string |
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200 | * @v rp IB SRP root path |
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201 | * @ret rc Return status code |
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202 | */ |
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203 | static int ib_srp_parse_dgid ( const char *rp_comp, |
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204 | struct ib_srp_root_path *rp ) { |
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205 | return ib_srp_parse_byte_string ( rp_comp, rp->ib->dgid.u.bytes, |
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206 | ( sizeof ( rp->ib->dgid ) | |
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207 | IB_SRP_PARSE_REQUIRED ) ); |
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208 | } |
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209 | |
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210 | /** |
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211 | * Parse IB SRP root path partition key |
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212 | * |
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213 | * @v rp_comp Root path component string |
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214 | * @v rp IB SRP root path |
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215 | * @ret rc Return status code |
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216 | */ |
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217 | static int ib_srp_parse_pkey ( const char *rp_comp, |
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218 | struct ib_srp_root_path *rp ) { |
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219 | int pkey; |
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220 | |
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221 | if ( ( pkey = ib_srp_parse_integer ( rp_comp, IB_PKEY_DEFAULT ) ) < 0 ) |
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222 | return pkey; |
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223 | rp->ib->pkey = pkey; |
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224 | return 0; |
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225 | } |
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226 | |
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227 | /** |
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228 | * Parse IB SRP root path service ID |
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229 | * |
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230 | * @v rp_comp Root path component string |
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231 | * @v rp IB SRP root path |
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232 | * @ret rc Return status code |
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233 | */ |
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234 | static int ib_srp_parse_service_id ( const char *rp_comp, |
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235 | struct ib_srp_root_path *rp ) { |
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236 | return ib_srp_parse_byte_string ( rp_comp, rp->ib->service_id.u.bytes, |
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237 | ( sizeof ( rp->ib->service_id ) | |
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238 | IB_SRP_PARSE_REQUIRED ) ); |
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239 | } |
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240 | |
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241 | /** |
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242 | * Parse IB SRP root path LUN |
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243 | * |
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244 | * @v rp_comp Root path component string |
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245 | * @v rp IB SRP root path |
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246 | * @ret rc Return status code |
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247 | */ |
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248 | static int ib_srp_parse_lun ( const char *rp_comp, |
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249 | struct ib_srp_root_path *rp ) { |
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250 | return scsi_parse_lun ( rp_comp, rp->lun ); |
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251 | } |
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252 | |
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253 | /** |
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254 | * Parse IB SRP root path target identifier extension |
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255 | * |
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256 | * @v rp_comp Root path component string |
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257 | * @v rp IB SRP root path |
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258 | * @ret rc Return status code |
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259 | */ |
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260 | static int ib_srp_parse_target_id_ext ( const char *rp_comp, |
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261 | struct ib_srp_root_path *rp ) { |
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262 | struct ib_srp_target_port_id *port_id = |
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263 | ib_srp_target_port_id ( rp->port_ids ); |
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264 | |
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265 | return ib_srp_parse_byte_string ( rp_comp, port_id->id_ext.u.bytes, |
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266 | ( sizeof ( port_id->id_ext ) | |
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267 | IB_SRP_PARSE_REQUIRED ) ); |
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268 | } |
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269 | |
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270 | /** |
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271 | * Parse IB SRP root path target I/O controller GUID |
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272 | * |
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273 | * @v rp_comp Root path component string |
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274 | * @v rp IB SRP root path |
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275 | * @ret rc Return status code |
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276 | */ |
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277 | static int ib_srp_parse_target_ioc_guid ( const char *rp_comp, |
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278 | struct ib_srp_root_path *rp ) { |
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279 | struct ib_srp_target_port_id *port_id = |
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280 | ib_srp_target_port_id ( rp->port_ids ); |
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281 | |
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282 | return ib_srp_parse_byte_string ( rp_comp, port_id->ioc_guid.u.bytes, |
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283 | ( sizeof ( port_id->ioc_guid ) | |
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284 | IB_SRP_PARSE_REQUIRED ) ); |
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285 | } |
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286 | |
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287 | /** IB SRP root path component parser */ |
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288 | struct ib_srp_root_path_parser { |
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289 | /** |
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290 | * Parse IB SRP root path component |
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291 | * |
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292 | * @v rp_comp Root path component string |
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293 | * @v rp IB SRP root path |
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294 | * @ret rc Return status code |
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295 | */ |
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296 | int ( * parse ) ( const char *rp_comp, struct ib_srp_root_path *rp ); |
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297 | }; |
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298 | |
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299 | /** IB SRP root path components */ |
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300 | static struct ib_srp_root_path_parser ib_srp_rp_parser[] = { |
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301 | { ib_srp_parse_literal }, |
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302 | { ib_srp_parse_sgid }, |
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303 | { ib_srp_parse_initiator_id_ext }, |
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304 | { ib_srp_parse_initiator_hca_guid }, |
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305 | { ib_srp_parse_dgid }, |
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306 | { ib_srp_parse_pkey }, |
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307 | { ib_srp_parse_service_id }, |
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308 | { ib_srp_parse_lun }, |
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309 | { ib_srp_parse_target_id_ext }, |
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310 | { ib_srp_parse_target_ioc_guid }, |
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311 | }; |
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312 | |
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313 | /** Number of IB SRP root path components */ |
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314 | #define IB_SRP_NUM_RP_COMPONENTS \ |
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315 | ( sizeof ( ib_srp_rp_parser ) / sizeof ( ib_srp_rp_parser[0] ) ) |
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316 | |
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317 | /** |
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318 | * Parse IB SRP root path |
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319 | * |
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320 | * @v srp SRP device |
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321 | * @v rp_string Root path |
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322 | * @ret rc Return status code |
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323 | */ |
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324 | static int ib_srp_parse_root_path ( struct srp_device *srp, |
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325 | const char *rp_string ) { |
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326 | struct ib_srp_parameters *ib_params = ib_srp_params ( srp ); |
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327 | struct ib_srp_root_path rp = { |
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328 | .lun = &srp->lun, |
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329 | .port_ids = &srp->port_ids, |
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330 | .ib = ib_params, |
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331 | }; |
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332 | char rp_string_copy[ strlen ( rp_string ) + 1 ]; |
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333 | char *rp_comp[IB_SRP_NUM_RP_COMPONENTS]; |
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334 | char *rp_string_tmp = rp_string_copy; |
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335 | unsigned int i = 0; |
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336 | int rc; |
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337 | |
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338 | /* Split root path into component parts */ |
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339 | strcpy ( rp_string_copy, rp_string ); |
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340 | while ( 1 ) { |
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341 | rp_comp[i++] = rp_string_tmp; |
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342 | if ( i == IB_SRP_NUM_RP_COMPONENTS ) |
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343 | break; |
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344 | for ( ; *rp_string_tmp != ':' ; rp_string_tmp++ ) { |
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345 | if ( ! *rp_string_tmp ) { |
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346 | DBGC ( srp, "SRP %p root path \"%s\" too " |
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347 | "short\n", srp, rp_string ); |
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348 | return -EINVAL_RP_TOO_SHORT; |
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349 | } |
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350 | } |
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351 | *(rp_string_tmp++) = '\0'; |
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352 | } |
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353 | |
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354 | /* Parse root path components */ |
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355 | for ( i = 0 ; i < IB_SRP_NUM_RP_COMPONENTS ; i++ ) { |
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356 | if ( ( rc = ib_srp_rp_parser[i].parse ( rp_comp[i], |
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357 | &rp ) ) != 0 ) { |
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358 | DBGC ( srp, "SRP %p could not parse \"%s\" in root " |
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359 | "path \"%s\": %s\n", srp, rp_comp[i], |
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360 | rp_string, strerror ( rc ) ); |
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361 | return rc; |
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362 | } |
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363 | } |
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364 | |
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365 | return 0; |
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366 | } |
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367 | |
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368 | /** |
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369 | * Connect IB SRP session |
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370 | * |
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371 | * @v srp SRP device |
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372 | * @ret rc Return status code |
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373 | */ |
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374 | static int ib_srp_connect ( struct srp_device *srp ) { |
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375 | struct ib_srp_parameters *ib_params = ib_srp_params ( srp ); |
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376 | struct ib_device *ibdev; |
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377 | int rc; |
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378 | |
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379 | /* Identify Infiniband device */ |
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380 | ibdev = find_ibdev ( &ib_params->sgid ); |
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381 | if ( ! ibdev ) { |
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382 | DBGC ( srp, "SRP %p could not identify Infiniband device\n", |
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383 | srp ); |
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384 | return -ENODEV; |
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385 | } |
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386 | |
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387 | /* Configure remaining SRP parameters */ |
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388 | srp->memory_handle = ibdev->rdma_key; |
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389 | |
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390 | /* Open CMRC socket */ |
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391 | if ( ( rc = ib_cmrc_open ( &srp->socket, ibdev, &ib_params->dgid, |
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392 | &ib_params->service_id ) ) != 0 ) { |
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393 | DBGC ( srp, "SRP %p could not open CMRC socket: %s\n", |
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394 | srp, strerror ( rc ) ); |
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395 | return rc; |
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396 | } |
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397 | |
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398 | return 0; |
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399 | } |
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400 | |
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401 | /** IB SRP transport type */ |
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402 | struct srp_transport_type ib_srp_transport = { |
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403 | .priv_len = sizeof ( struct ib_srp_parameters ), |
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404 | .parse_root_path = ib_srp_parse_root_path, |
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405 | .connect = ib_srp_connect, |
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406 | }; |
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