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 * 9 * This software is available to you under a choice of one of two 10 * licenses. You may choose to be licensed under the terms of the GNU 11 * General Public License (GPL) Version 2, available from the file 12 * COPYING in the main directory of this source tree, or the 13 * OpenIB.org BSD license below: 14 * 15 * Redistribution and use in source and binary forms, with or 16 * without modification, are permitted provided that the following 17 * conditions are met: 18 * 19 * - Redistributions of source code must retain the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer. 22 * 23 * - Redistributions in binary form must reproduce the above 24 * copyright notice, this list of conditions and the following 25 * disclaimer in the documentation and/or other materials 26 * provided with the distribution. 27 * 28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 29 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 31 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 32 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 33 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 34 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 35 * SOFTWARE. 36 * 37 */ 38 39#include <rdma/ib_smi.h> 40#include "smi.h" 41 42/* 43 * Fixup a directed route SMP for sending 44 * Return 0 if the SMP should be discarded 45 */ 46enum smi_action smi_handle_dr_smp_send(struct ib_smp *smp, 47 u8 node_type, int port_num) 48{ 49 u8 hop_ptr, hop_cnt; 50 51 hop_ptr = smp->hop_ptr; 52 hop_cnt = smp->hop_cnt; 53 54 /* See section 14.2.2.2, Vol 1 IB spec */ 55 /* C14-6 -- valid hop_cnt values are from 0 to 63 */ 56 if (hop_cnt >= IB_SMP_MAX_PATH_HOPS) 57 return IB_SMI_DISCARD; 58 59 if (!ib_get_smp_direction(smp)) { 60 /* C14-9:1 */ 61 if (hop_cnt && hop_ptr == 0) { 62 smp->hop_ptr++; 63 return (smp->initial_path[smp->hop_ptr] == 64 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); 65 } 66 67 /* C14-9:2 */ 68 if (hop_ptr && hop_ptr < hop_cnt) { 69 if (node_type != RDMA_NODE_IB_SWITCH) 70 return IB_SMI_DISCARD; 71 72 /* smp->return_path set when received */ 73 smp->hop_ptr++; 74 return (smp->initial_path[smp->hop_ptr] == 75 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); 76 } 77 78 /* C14-9:3 -- We're at the end of the DR segment of path */ 79 if (hop_ptr == hop_cnt) { 80 /* smp->return_path set when received */ 81 smp->hop_ptr++; 82 return (node_type == RDMA_NODE_IB_SWITCH || 83 smp->dr_dlid == IB_LID_PERMISSIVE ? 84 IB_SMI_HANDLE : IB_SMI_DISCARD); 85 } 86 87 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ 88 /* C14-9:5 -- Fail unreasonable hop pointer */ 89 return (hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD); 90 91 } else { 92 /* C14-13:1 */ 93 if (hop_cnt && hop_ptr == hop_cnt + 1) { 94 smp->hop_ptr--; 95 return (smp->return_path[smp->hop_ptr] == 96 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); 97 } 98 99 /* C14-13:2 */ 100 if (2 <= hop_ptr && hop_ptr <= hop_cnt) { 101 if (node_type != RDMA_NODE_IB_SWITCH) 102 return IB_SMI_DISCARD; 103 104 smp->hop_ptr--; 105 return (smp->return_path[smp->hop_ptr] == 106 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); 107 } 108 109 /* C14-13:3 -- at the end of the DR segment of path */ 110 if (hop_ptr == 1) { 111 smp->hop_ptr--; 112 /* C14-13:3 -- SMPs destined for SM shouldn't be here */ 113 return (node_type == RDMA_NODE_IB_SWITCH || 114 smp->dr_slid == IB_LID_PERMISSIVE ? 115 IB_SMI_HANDLE : IB_SMI_DISCARD); 116 } 117 118 /* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */ 119 if (hop_ptr == 0) 120 return IB_SMI_HANDLE; 121 122 /* C14-13:5 -- Check for unreasonable hop pointer */ 123 return IB_SMI_DISCARD; 124 } 125} 126 127/* 128 * Adjust information for a received SMP 129 * Return 0 if the SMP should be dropped 130 */ 131enum smi_action smi_handle_dr_smp_recv(struct ib_smp *smp, u8 node_type, 132 int port_num, int phys_port_cnt) 133{ 134 u8 hop_ptr, hop_cnt; 135 136 hop_ptr = smp->hop_ptr; 137 hop_cnt = smp->hop_cnt; 138 139 /* See section 14.2.2.2, Vol 1 IB spec */ 140 /* C14-6 -- valid hop_cnt values are from 0 to 63 */ 141 if (hop_cnt >= IB_SMP_MAX_PATH_HOPS) 142 return IB_SMI_DISCARD; 143 144 if (!ib_get_smp_direction(smp)) { 145 /* C14-9:1 -- sender should have incremented hop_ptr */ 146 if (hop_cnt && hop_ptr == 0) 147 return IB_SMI_DISCARD; 148 149 /* C14-9:2 -- intermediate hop */ 150 if (hop_ptr && hop_ptr < hop_cnt) { 151 if (node_type != RDMA_NODE_IB_SWITCH) 152 return IB_SMI_DISCARD; 153 154 smp->return_path[hop_ptr] = port_num; 155 /* smp->hop_ptr updated when sending */ 156 return (smp->initial_path[hop_ptr+1] <= phys_port_cnt ? 157 IB_SMI_HANDLE : IB_SMI_DISCARD); 158 } 159 160 /* C14-9:3 -- We're at the end of the DR segment of path */ 161 if (hop_ptr == hop_cnt) { 162 if (hop_cnt) 163 smp->return_path[hop_ptr] = port_num; 164 /* smp->hop_ptr updated when sending */ 165 166 return (node_type == RDMA_NODE_IB_SWITCH || 167 smp->dr_dlid == IB_LID_PERMISSIVE ? 168 IB_SMI_HANDLE : IB_SMI_DISCARD); 169 } 170 171 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ 172 /* C14-9:5 -- fail unreasonable hop pointer */ 173 return (hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD); 174 175 } else { 176 177 /* C14-13:1 */ 178 if (hop_cnt && hop_ptr == hop_cnt + 1) { 179 smp->hop_ptr--; 180 return (smp->return_path[smp->hop_ptr] == 181 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); 182 } 183 184 /* C14-13:2 */ 185 if (2 <= hop_ptr && hop_ptr <= hop_cnt) { 186 if (node_type != RDMA_NODE_IB_SWITCH) 187 return IB_SMI_DISCARD; 188 189 /* smp->hop_ptr updated when sending */ 190 return (smp->return_path[hop_ptr-1] <= phys_port_cnt ? 191 IB_SMI_HANDLE : IB_SMI_DISCARD); 192 } 193 194 /* C14-13:3 -- We're at the end of the DR segment of path */ 195 if (hop_ptr == 1) { 196 if (smp->dr_slid == IB_LID_PERMISSIVE) { 197 /* giving SMP to SM - update hop_ptr */ 198 smp->hop_ptr--; 199 return IB_SMI_HANDLE; 200 } 201 /* smp->hop_ptr updated when sending */ 202 return (node_type == RDMA_NODE_IB_SWITCH ? 203 IB_SMI_HANDLE : IB_SMI_DISCARD); 204 } 205 206 /* C14-13:4 -- hop_ptr = 0 -> give to SM */ 207 /* C14-13:5 -- Check for unreasonable hop pointer */ 208 return (hop_ptr == 0 ? IB_SMI_HANDLE : IB_SMI_DISCARD); 209 } 210} 211 212enum smi_forward_action smi_check_forward_dr_smp(struct ib_smp *smp) 213{ 214 u8 hop_ptr, hop_cnt; 215 216 hop_ptr = smp->hop_ptr; 217 hop_cnt = smp->hop_cnt; 218 219 if (!ib_get_smp_direction(smp)) { 220 /* C14-9:2 -- intermediate hop */ 221 if (hop_ptr && hop_ptr < hop_cnt) 222 return IB_SMI_FORWARD; 223 224 /* C14-9:3 -- at the end of the DR segment of path */ 225 if (hop_ptr == hop_cnt) 226 return (smp->dr_dlid == IB_LID_PERMISSIVE ? 227 IB_SMI_SEND : IB_SMI_LOCAL); 228 229 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ 230 if (hop_ptr == hop_cnt + 1) 231 return IB_SMI_SEND; 232 } else { 233 /* C14-13:2 -- intermediate hop */ 234 if (2 <= hop_ptr && hop_ptr <= hop_cnt) 235 return IB_SMI_FORWARD; 236 237 /* C14-13:3 -- at the end of the DR segment of path */ 238 if (hop_ptr == 1) 239 return (smp->dr_slid != IB_LID_PERMISSIVE ? 240 IB_SMI_SEND : IB_SMI_LOCAL); 241 } 242 return IB_SMI_LOCAL; 243} 244 245/* 246 * Return the forwarding port number from initial_path for outgoing SMP and 247 * from return_path for returning SMP 248 */ 249int smi_get_fwd_port(struct ib_smp *smp) 250{ 251 return (!ib_get_smp_direction(smp) ? smp->initial_path[smp->hop_ptr+1] : 252 smp->return_path[smp->hop_ptr-1]); 253} 254