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 if (!ib_get_smp_direction(smp)) { 56 /* C14-9:1 */ 57 if (hop_cnt && hop_ptr == 0) { 58 smp->hop_ptr++; 59 return (smp->initial_path[smp->hop_ptr] == 60 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); 61 } 62 63 /* C14-9:2 */ 64 if (hop_ptr && hop_ptr < hop_cnt) { 65 if (node_type != RDMA_NODE_IB_SWITCH) 66 return IB_SMI_DISCARD; 67 68 /* smp->return_path set when received */ 69 smp->hop_ptr++; 70 return (smp->initial_path[smp->hop_ptr] == 71 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); 72 } 73 74 /* C14-9:3 -- We're at the end of the DR segment of path */ 75 if (hop_ptr == hop_cnt) { 76 /* smp->return_path set when received */ 77 smp->hop_ptr++; 78 return (node_type == RDMA_NODE_IB_SWITCH || 79 smp->dr_dlid == IB_LID_PERMISSIVE ? 80 IB_SMI_HANDLE : IB_SMI_DISCARD); 81 } 82 83 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ 84 /* C14-9:5 -- Fail unreasonable hop pointer */ 85 return (hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD); 86 87 } else { 88 /* C14-13:1 */ 89 if (hop_cnt && hop_ptr == hop_cnt + 1) { 90 smp->hop_ptr--; 91 return (smp->return_path[smp->hop_ptr] == 92 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); 93 } 94 95 /* C14-13:2 */ 96 if (2 <= hop_ptr && hop_ptr <= hop_cnt) { 97 if (node_type != RDMA_NODE_IB_SWITCH) 98 return IB_SMI_DISCARD; 99 100 smp->hop_ptr--; 101 return (smp->return_path[smp->hop_ptr] == 102 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); 103 } 104 105 /* C14-13:3 -- at the end of the DR segment of path */ 106 if (hop_ptr == 1) { 107 smp->hop_ptr--; 108 /* C14-13:3 -- SMPs destined for SM shouldn't be here */ 109 return (node_type == RDMA_NODE_IB_SWITCH || 110 smp->dr_slid == IB_LID_PERMISSIVE ? 111 IB_SMI_HANDLE : IB_SMI_DISCARD); 112 } 113 114 /* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */ 115 if (hop_ptr == 0) 116 return IB_SMI_HANDLE; 117 118 /* C14-13:5 -- Check for unreasonable hop pointer */ 119 return IB_SMI_DISCARD; 120 } 121} 122 123/* 124 * Adjust information for a received SMP 125 * Return 0 if the SMP should be dropped 126 */ 127enum smi_action smi_handle_dr_smp_recv(struct ib_smp *smp, u8 node_type, 128 int port_num, int phys_port_cnt) 129{ 130 u8 hop_ptr, hop_cnt; 131 132 hop_ptr = smp->hop_ptr; 133 hop_cnt = smp->hop_cnt; 134 135 /* See section 14.2.2.2, Vol 1 IB spec */ 136 if (!ib_get_smp_direction(smp)) { 137 /* C14-9:1 -- sender should have incremented hop_ptr */ 138 if (hop_cnt && hop_ptr == 0) 139 return IB_SMI_DISCARD; 140 141 /* C14-9:2 -- intermediate hop */ 142 if (hop_ptr && hop_ptr < hop_cnt) { 143 if (node_type != RDMA_NODE_IB_SWITCH) 144 return IB_SMI_DISCARD; 145 146 smp->return_path[hop_ptr] = port_num; 147 /* smp->hop_ptr updated when sending */ 148 return (smp->initial_path[hop_ptr+1] <= phys_port_cnt ? 149 IB_SMI_HANDLE : IB_SMI_DISCARD); 150 } 151 152 /* C14-9:3 -- We're at the end of the DR segment of path */ 153 if (hop_ptr == hop_cnt) { 154 if (hop_cnt) 155 smp->return_path[hop_ptr] = port_num; 156 /* smp->hop_ptr updated when sending */ 157 158 return (node_type == RDMA_NODE_IB_SWITCH || 159 smp->dr_dlid == IB_LID_PERMISSIVE ? 160 IB_SMI_HANDLE : IB_SMI_DISCARD); 161 } 162 163 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ 164 /* C14-9:5 -- fail unreasonable hop pointer */ 165 return (hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD); 166 167 } else { 168 169 /* C14-13:1 */ 170 if (hop_cnt && hop_ptr == hop_cnt + 1) { 171 smp->hop_ptr--; 172 return (smp->return_path[smp->hop_ptr] == 173 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD); 174 } 175 176 /* C14-13:2 */ 177 if (2 <= hop_ptr && hop_ptr <= hop_cnt) { 178 if (node_type != RDMA_NODE_IB_SWITCH) 179 return IB_SMI_DISCARD; 180 181 /* smp->hop_ptr updated when sending */ 182 return (smp->return_path[hop_ptr-1] <= phys_port_cnt ? 183 IB_SMI_HANDLE : IB_SMI_DISCARD); 184 } 185 186 /* C14-13:3 -- We're at the end of the DR segment of path */ 187 if (hop_ptr == 1) { 188 if (smp->dr_slid == IB_LID_PERMISSIVE) { 189 /* giving SMP to SM - update hop_ptr */ 190 smp->hop_ptr--; 191 return IB_SMI_HANDLE; 192 } 193 /* smp->hop_ptr updated when sending */ 194 return (node_type == RDMA_NODE_IB_SWITCH ? 195 IB_SMI_HANDLE : IB_SMI_DISCARD); 196 } 197 198 /* C14-13:4 -- hop_ptr = 0 -> give to SM */ 199 /* C14-13:5 -- Check for unreasonable hop pointer */ 200 return (hop_ptr == 0 ? IB_SMI_HANDLE : IB_SMI_DISCARD); 201 } 202} 203 204enum smi_forward_action smi_check_forward_dr_smp(struct ib_smp *smp) 205{ 206 u8 hop_ptr, hop_cnt; 207 208 hop_ptr = smp->hop_ptr; 209 hop_cnt = smp->hop_cnt; 210 211 if (!ib_get_smp_direction(smp)) { 212 /* C14-9:2 -- intermediate hop */ 213 if (hop_ptr && hop_ptr < hop_cnt) 214 return IB_SMI_FORWARD; 215 216 /* C14-9:3 -- at the end of the DR segment of path */ 217 if (hop_ptr == hop_cnt) 218 return (smp->dr_dlid == IB_LID_PERMISSIVE ? 219 IB_SMI_SEND : IB_SMI_LOCAL); 220 221 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ 222 if (hop_ptr == hop_cnt + 1) 223 return IB_SMI_SEND; 224 } else { 225 /* C14-13:2 -- intermediate hop */ 226 if (2 <= hop_ptr && hop_ptr <= hop_cnt) 227 return IB_SMI_FORWARD; 228 229 /* C14-13:3 -- at the end of the DR segment of path */ 230 if (hop_ptr == 1) 231 return (smp->dr_slid != IB_LID_PERMISSIVE ? 232 IB_SMI_SEND : IB_SMI_LOCAL); 233 } 234 return IB_SMI_LOCAL; 235} 236 237/* 238 * Return the forwarding port number from initial_path for outgoing SMP and 239 * from return_path for returning SMP 240 */ 241int smi_get_fwd_port(struct ib_smp *smp) 242{ 243 return (!ib_get_smp_direction(smp) ? smp->initial_path[smp->hop_ptr+1] : 244 smp->return_path[smp->hop_ptr-1]); 245} 246