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, 2005 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 * $Id: smi.c 1389 2004-12-27 22:56:47Z roland $ 38 */ 39 40 #include <rdma/ib_smi.h> 41 #include "smi.h" 42 43 /* 44 * Fixup a directed route SMP for sending 45 * Return 0 if the SMP should be discarded 46 */ 47 int smi_handle_dr_smp_send(struct ib_smp *smp, 48 u8 node_type, 49 int port_num) 50 { 51 u8 hop_ptr, hop_cnt; 52 53 hop_ptr = smp->hop_ptr; 54 hop_cnt = smp->hop_cnt; 55 56 /* See section 14.2.2.2, Vol 1 IB spec */ 57 if (!ib_get_smp_direction(smp)) { 58 /* C14-9:1 */ 59 if (hop_cnt && hop_ptr == 0) { 60 smp->hop_ptr++; 61 return (smp->initial_path[smp->hop_ptr] == 62 port_num); 63 } 64 65 /* C14-9:2 */ 66 if (hop_ptr && hop_ptr < hop_cnt) { 67 if (node_type != IB_NODE_SWITCH) 68 return 0; 69 70 /* smp->return_path set when received */ 71 smp->hop_ptr++; 72 return (smp->initial_path[smp->hop_ptr] == 73 port_num); 74 } 75 76 /* C14-9:3 -- We're at the end of the DR segment of path */ 77 if (hop_ptr == hop_cnt) { 78 /* smp->return_path set when received */ 79 smp->hop_ptr++; 80 return (node_type == IB_NODE_SWITCH || 81 smp->dr_dlid == IB_LID_PERMISSIVE); 82 } 83 84 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ 85 /* C14-9:5 -- Fail unreasonable hop pointer */ 86 return (hop_ptr == hop_cnt + 1); 87 88 } else { 89 /* C14-13:1 */ 90 if (hop_cnt && hop_ptr == hop_cnt + 1) { 91 smp->hop_ptr--; 92 return (smp->return_path[smp->hop_ptr] == 93 port_num); 94 } 95 96 /* C14-13:2 */ 97 if (2 <= hop_ptr && hop_ptr <= hop_cnt) { 98 if (node_type != IB_NODE_SWITCH) 99 return 0; 100 101 smp->hop_ptr--; 102 return (smp->return_path[smp->hop_ptr] == 103 port_num); 104 } 105 106 /* C14-13:3 -- at the end of the DR segment of path */ 107 if (hop_ptr == 1) { 108 smp->hop_ptr--; 109 /* C14-13:3 -- SMPs destined for SM shouldn't be here */ 110 return (node_type == IB_NODE_SWITCH || 111 smp->dr_slid == IB_LID_PERMISSIVE); 112 } 113 114 /* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */ 115 if (hop_ptr == 0) 116 return 1; 117 118 /* C14-13:5 -- Check for unreasonable hop pointer */ 119 return 0; 120 } 121 } 122 123 /* 124 * Adjust information for a received SMP 125 * Return 0 if the SMP should be dropped 126 */ 127 int smi_handle_dr_smp_recv(struct ib_smp *smp, 128 u8 node_type, 129 int port_num, 130 int phys_port_cnt) 131 { 132 u8 hop_ptr, hop_cnt; 133 134 hop_ptr = smp->hop_ptr; 135 hop_cnt = smp->hop_cnt; 136 137 /* See section 14.2.2.2, Vol 1 IB spec */ 138 if (!ib_get_smp_direction(smp)) { 139 /* C14-9:1 -- sender should have incremented hop_ptr */ 140 if (hop_cnt && hop_ptr == 0) 141 return 0; 142 143 /* C14-9:2 -- intermediate hop */ 144 if (hop_ptr && hop_ptr < hop_cnt) { 145 if (node_type != IB_NODE_SWITCH) 146 return 0; 147 148 smp->return_path[hop_ptr] = port_num; 149 /* smp->hop_ptr updated when sending */ 150 return (smp->initial_path[hop_ptr+1] <= phys_port_cnt); 151 } 152 153 /* C14-9:3 -- We're at the end of the DR segment of path */ 154 if (hop_ptr == hop_cnt) { 155 if (hop_cnt) 156 smp->return_path[hop_ptr] = port_num; 157 /* smp->hop_ptr updated when sending */ 158 159 return (node_type == IB_NODE_SWITCH || 160 smp->dr_dlid == IB_LID_PERMISSIVE); 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); 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); 174 } 175 176 /* C14-13:2 */ 177 if (2 <= hop_ptr && hop_ptr <= hop_cnt) { 178 if (node_type != IB_NODE_SWITCH) 179 return 0; 180 181 /* smp->hop_ptr updated when sending */ 182 return (smp->return_path[hop_ptr-1] <= phys_port_cnt); 183 } 184 185 /* C14-13:3 -- We're at the end of the DR segment of path */ 186 if (hop_ptr == 1) { 187 if (smp->dr_slid == IB_LID_PERMISSIVE) { 188 /* giving SMP to SM - update hop_ptr */ 189 smp->hop_ptr--; 190 return 1; 191 } 192 /* smp->hop_ptr updated when sending */ 193 return (node_type == IB_NODE_SWITCH); 194 } 195 196 /* C14-13:4 -- hop_ptr = 0 -> give to SM */ 197 /* C14-13:5 -- Check for unreasonable hop pointer */ 198 return (hop_ptr == 0); 199 } 200 } 201 202 /* 203 * Return 1 if the received DR SMP should be forwarded to the send queue 204 * Return 0 if the SMP should be completed up the stack 205 */ 206 int smi_check_forward_dr_smp(struct ib_smp *smp) 207 { 208 u8 hop_ptr, hop_cnt; 209 210 hop_ptr = smp->hop_ptr; 211 hop_cnt = smp->hop_cnt; 212 213 if (!ib_get_smp_direction(smp)) { 214 /* C14-9:2 -- intermediate hop */ 215 if (hop_ptr && hop_ptr < hop_cnt) 216 return 1; 217 218 /* C14-9:3 -- at the end of the DR segment of path */ 219 if (hop_ptr == hop_cnt) 220 return (smp->dr_dlid == IB_LID_PERMISSIVE); 221 222 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ 223 if (hop_ptr == hop_cnt + 1) 224 return 1; 225 } else { 226 /* C14-13:2 */ 227 if (2 <= hop_ptr && hop_ptr <= hop_cnt) 228 return 1; 229 230 /* C14-13:3 -- at the end of the DR segment of path */ 231 if (hop_ptr == 1) 232 return (smp->dr_slid != IB_LID_PERMISSIVE); 233 } 234 return 0; 235 } 236