1 /* 2 * Copyright (c) 2004, 2005 Mellanox Technologies Ltd. All rights reserved. 3 * Copyright (c) 2004, 2005 Infinicon Corporation. All rights reserved. 4 * Copyright (c) 2004, 2005 Intel Corporation. All rights reserved. 5 * Copyright (c) 2004, 2005 Topspin Corporation. All rights reserved. 6 * Copyright (c) 2004-2007 Voltaire Corporation. All rights reserved. 7 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 8 * Copyright (c) 2014 Intel Corporation. All rights reserved. 9 * 10 * This software is available to you under a choice of one of two 11 * licenses. You may choose to be licensed under the terms of the GNU 12 * General Public License (GPL) Version 2, available from the file 13 * COPYING in the main directory of this source tree, or the 14 * OpenIB.org BSD license below: 15 * 16 * Redistribution and use in source and binary forms, with or 17 * without modification, are permitted provided that the following 18 * conditions are met: 19 * 20 * - Redistributions of source code must retain the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer. 23 * 24 * - Redistributions in binary form must reproduce the above 25 * copyright notice, this list of conditions and the following 26 * disclaimer in the documentation and/or other materials 27 * provided with the distribution. 28 * 29 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 30 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 31 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 32 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 33 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 34 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 35 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 36 * SOFTWARE. 37 * 38 */ 39 40 #include <rdma/ib_smi.h> 41 #include "smi.h" 42 #include "opa_smi.h" 43 44 static enum smi_action __smi_handle_dr_smp_send(bool is_switch, u32 port_num, 45 u8 *hop_ptr, u8 hop_cnt, 46 const u8 *initial_path, 47 const u8 *return_path, 48 u8 direction, 49 bool dr_dlid_is_permissive, 50 bool dr_slid_is_permissive) 51 { 52 /* See section 14.2.2.2, Vol 1 IB spec */ 53 /* C14-6 -- valid hop_cnt values are from 0 to 63 */ 54 if (hop_cnt >= IB_SMP_MAX_PATH_HOPS) 55 return IB_SMI_DISCARD; 56 57 if (!direction) { 58 /* C14-9:1 */ 59 if (hop_cnt && *hop_ptr == 0) { 60 (*hop_ptr)++; 61 return (initial_path[*hop_ptr] == 62 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); 63 } 64 65 /* C14-9:2 */ 66 if (*hop_ptr && *hop_ptr < hop_cnt) { 67 if (!is_switch) 68 return IB_SMI_DISCARD; 69 70 /* return_path set when received */ 71 (*hop_ptr)++; 72 return (initial_path[*hop_ptr] == 73 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); 74 } 75 76 /* C14-9:3 -- We're at the end of the DR segment of path */ 77 if (*hop_ptr == hop_cnt) { 78 /* return_path set when received */ 79 (*hop_ptr)++; 80 return (is_switch || 81 dr_dlid_is_permissive ? 82 IB_SMI_HANDLE : IB_SMI_DISCARD); 83 } 84 85 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ 86 /* C14-9:5 -- Fail unreasonable hop pointer */ 87 return (*hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD); 88 89 } else { 90 /* C14-13:1 */ 91 if (hop_cnt && *hop_ptr == hop_cnt + 1) { 92 (*hop_ptr)--; 93 return (return_path[*hop_ptr] == 94 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); 95 } 96 97 /* C14-13:2 */ 98 if (2 <= *hop_ptr && *hop_ptr <= hop_cnt) { 99 if (!is_switch) 100 return IB_SMI_DISCARD; 101 102 (*hop_ptr)--; 103 return (return_path[*hop_ptr] == 104 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); 105 } 106 107 /* C14-13:3 -- at the end of the DR segment of path */ 108 if (*hop_ptr == 1) { 109 (*hop_ptr)--; 110 /* C14-13:3 -- SMPs destined for SM shouldn't be here */ 111 return (is_switch || 112 dr_slid_is_permissive ? 113 IB_SMI_HANDLE : IB_SMI_DISCARD); 114 } 115 116 /* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */ 117 if (*hop_ptr == 0) 118 return IB_SMI_HANDLE; 119 120 /* C14-13:5 -- Check for unreasonable hop pointer */ 121 return IB_SMI_DISCARD; 122 } 123 } 124 125 /* 126 * Fixup a directed route SMP for sending 127 * Return IB_SMI_DISCARD if the SMP should be discarded 128 */ 129 enum smi_action smi_handle_dr_smp_send(struct ib_smp *smp, 130 bool is_switch, u32 port_num) 131 { 132 return __smi_handle_dr_smp_send(is_switch, port_num, 133 &smp->hop_ptr, smp->hop_cnt, 134 smp->initial_path, 135 smp->return_path, 136 ib_get_smp_direction(smp), 137 smp->dr_dlid == IB_LID_PERMISSIVE, 138 smp->dr_slid == IB_LID_PERMISSIVE); 139 } 140 141 enum smi_action opa_smi_handle_dr_smp_send(struct opa_smp *smp, 142 bool is_switch, u32 port_num) 143 { 144 return __smi_handle_dr_smp_send(is_switch, port_num, 145 &smp->hop_ptr, smp->hop_cnt, 146 smp->route.dr.initial_path, 147 smp->route.dr.return_path, 148 opa_get_smp_direction(smp), 149 smp->route.dr.dr_dlid == 150 OPA_LID_PERMISSIVE, 151 smp->route.dr.dr_slid == 152 OPA_LID_PERMISSIVE); 153 } 154 155 static enum smi_action __smi_handle_dr_smp_recv(bool is_switch, u32 port_num, 156 int phys_port_cnt, 157 u8 *hop_ptr, u8 hop_cnt, 158 const u8 *initial_path, 159 u8 *return_path, 160 u8 direction, 161 bool dr_dlid_is_permissive, 162 bool dr_slid_is_permissive) 163 { 164 /* See section 14.2.2.2, Vol 1 IB spec */ 165 /* C14-6 -- valid hop_cnt values are from 0 to 63 */ 166 if (hop_cnt >= IB_SMP_MAX_PATH_HOPS) 167 return IB_SMI_DISCARD; 168 169 if (!direction) { 170 /* C14-9:1 -- sender should have incremented hop_ptr */ 171 if (hop_cnt && *hop_ptr == 0) 172 return IB_SMI_DISCARD; 173 174 /* C14-9:2 -- intermediate hop */ 175 if (*hop_ptr && *hop_ptr < hop_cnt) { 176 if (!is_switch) 177 return IB_SMI_DISCARD; 178 179 return_path[*hop_ptr] = port_num; 180 /* hop_ptr updated when sending */ 181 return (initial_path[*hop_ptr+1] <= phys_port_cnt ? 182 IB_SMI_HANDLE : IB_SMI_DISCARD); 183 } 184 185 /* C14-9:3 -- We're at the end of the DR segment of path */ 186 if (*hop_ptr == hop_cnt) { 187 if (hop_cnt) 188 return_path[*hop_ptr] = port_num; 189 /* hop_ptr updated when sending */ 190 191 return (is_switch || 192 dr_dlid_is_permissive ? 193 IB_SMI_HANDLE : IB_SMI_DISCARD); 194 } 195 196 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ 197 /* C14-9:5 -- fail unreasonable hop pointer */ 198 return (*hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD); 199 200 } else { 201 202 /* C14-13:1 */ 203 if (hop_cnt && *hop_ptr == hop_cnt + 1) { 204 (*hop_ptr)--; 205 return (return_path[*hop_ptr] == 206 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); 207 } 208 209 /* C14-13:2 */ 210 if (2 <= *hop_ptr && *hop_ptr <= hop_cnt) { 211 if (!is_switch) 212 return IB_SMI_DISCARD; 213 214 /* hop_ptr updated when sending */ 215 return (return_path[*hop_ptr-1] <= phys_port_cnt ? 216 IB_SMI_HANDLE : IB_SMI_DISCARD); 217 } 218 219 /* C14-13:3 -- We're at the end of the DR segment of path */ 220 if (*hop_ptr == 1) { 221 if (dr_slid_is_permissive) { 222 /* giving SMP to SM - update hop_ptr */ 223 (*hop_ptr)--; 224 return IB_SMI_HANDLE; 225 } 226 /* hop_ptr updated when sending */ 227 return (is_switch ? IB_SMI_HANDLE : IB_SMI_DISCARD); 228 } 229 230 /* C14-13:4 -- hop_ptr = 0 -> give to SM */ 231 /* C14-13:5 -- Check for unreasonable hop pointer */ 232 return (*hop_ptr == 0 ? IB_SMI_HANDLE : IB_SMI_DISCARD); 233 } 234 } 235 236 /* 237 * Adjust information for a received SMP 238 * Return IB_SMI_DISCARD if the SMP should be dropped 239 */ 240 enum smi_action smi_handle_dr_smp_recv(struct ib_smp *smp, bool is_switch, 241 u32 port_num, int phys_port_cnt) 242 { 243 return __smi_handle_dr_smp_recv(is_switch, port_num, phys_port_cnt, 244 &smp->hop_ptr, smp->hop_cnt, 245 smp->initial_path, 246 smp->return_path, 247 ib_get_smp_direction(smp), 248 smp->dr_dlid == IB_LID_PERMISSIVE, 249 smp->dr_slid == IB_LID_PERMISSIVE); 250 } 251 252 /* 253 * Adjust information for a received SMP 254 * Return IB_SMI_DISCARD if the SMP should be dropped 255 */ 256 enum smi_action opa_smi_handle_dr_smp_recv(struct opa_smp *smp, bool is_switch, 257 u32 port_num, int phys_port_cnt) 258 { 259 return __smi_handle_dr_smp_recv(is_switch, port_num, phys_port_cnt, 260 &smp->hop_ptr, smp->hop_cnt, 261 smp->route.dr.initial_path, 262 smp->route.dr.return_path, 263 opa_get_smp_direction(smp), 264 smp->route.dr.dr_dlid == 265 OPA_LID_PERMISSIVE, 266 smp->route.dr.dr_slid == 267 OPA_LID_PERMISSIVE); 268 } 269 270 static enum smi_forward_action __smi_check_forward_dr_smp(u8 hop_ptr, u8 hop_cnt, 271 u8 direction, 272 bool dr_dlid_is_permissive, 273 bool dr_slid_is_permissive) 274 { 275 if (!direction) { 276 /* C14-9:2 -- intermediate hop */ 277 if (hop_ptr && hop_ptr < hop_cnt) 278 return IB_SMI_FORWARD; 279 280 /* C14-9:3 -- at the end of the DR segment of path */ 281 if (hop_ptr == hop_cnt) 282 return (dr_dlid_is_permissive ? 283 IB_SMI_SEND : IB_SMI_LOCAL); 284 285 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ 286 if (hop_ptr == hop_cnt + 1) 287 return IB_SMI_SEND; 288 } else { 289 /* C14-13:2 -- intermediate hop */ 290 if (2 <= hop_ptr && hop_ptr <= hop_cnt) 291 return IB_SMI_FORWARD; 292 293 /* C14-13:3 -- at the end of the DR segment of path */ 294 if (hop_ptr == 1) 295 return (!dr_slid_is_permissive ? 296 IB_SMI_SEND : IB_SMI_LOCAL); 297 } 298 return IB_SMI_LOCAL; 299 300 } 301 302 enum smi_forward_action smi_check_forward_dr_smp(struct ib_smp *smp) 303 { 304 return __smi_check_forward_dr_smp(smp->hop_ptr, smp->hop_cnt, 305 ib_get_smp_direction(smp), 306 smp->dr_dlid == IB_LID_PERMISSIVE, 307 smp->dr_slid == IB_LID_PERMISSIVE); 308 } 309 310 enum smi_forward_action opa_smi_check_forward_dr_smp(struct opa_smp *smp) 311 { 312 return __smi_check_forward_dr_smp(smp->hop_ptr, smp->hop_cnt, 313 opa_get_smp_direction(smp), 314 smp->route.dr.dr_dlid == 315 OPA_LID_PERMISSIVE, 316 smp->route.dr.dr_slid == 317 OPA_LID_PERMISSIVE); 318 } 319 320 /* 321 * Return the forwarding port number from initial_path for outgoing SMP and 322 * from return_path for returning SMP 323 */ 324 int smi_get_fwd_port(struct ib_smp *smp) 325 { 326 return (!ib_get_smp_direction(smp) ? smp->initial_path[smp->hop_ptr+1] : 327 smp->return_path[smp->hop_ptr-1]); 328 } 329 330 /* 331 * Return the forwarding port number from initial_path for outgoing SMP and 332 * from return_path for returning SMP 333 */ 334 int opa_smi_get_fwd_port(struct opa_smp *smp) 335 { 336 return !opa_get_smp_direction(smp) ? smp->route.dr.initial_path[smp->hop_ptr+1] : 337 smp->route.dr.return_path[smp->hop_ptr-1]; 338 } 339