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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 two11 * licenses. You may choose to be licensed under the terms of the GNU12 * General Public License (GPL) Version 2, available from the file13 * COPYING in the main directory of this source tree, or the14 * OpenIB.org BSD license below:15 *16 * Redistribution and use in source and binary forms, with or17 * without modification, are permitted provided that the following18 * conditions are met:19 *20 * - Redistributions of source code must retain the above21 * copyright notice, this list of conditions and the following22 * disclaimer.23 *24 * - Redistributions in binary form must reproduce the above25 * copyright notice, this list of conditions and the following26 * disclaimer in the documentation and/or other materials27 * 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 OF31 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND32 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS33 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN34 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN35 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE36 * SOFTWARE.37 *38 */39 40#include <rdma/ib_smi.h>41#include "smi.h"42#include "opa_smi.h"43 44static 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 sending127 * Return IB_SMI_DISCARD if the SMP should be discarded128 */129enum 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 141enum 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 155static 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 SMP238 * Return IB_SMI_DISCARD if the SMP should be dropped239 */240enum 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 SMP254 * Return IB_SMI_DISCARD if the SMP should be dropped255 */256enum 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 270static 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 302enum 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 310enum 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 and322 * from return_path for returning SMP323 */324int 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 and332 * from return_path for returning SMP333 */334int 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