| 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, int 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, int 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, int 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, int 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 | int 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 | int 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 | } |