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1da177e4 | 1 | /* |
2a1d9b7f RD |
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. | |
1da177e4 LT |
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 | ||
a4d61e84 | 40 | #include <rdma/ib_smi.h> |
1da177e4 LT |
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 | } |