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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2004 Mellanox Technologies Ltd. All rights reserved. | |
3 | * Copyright (c) 2004 Infinicon Corporation. All rights reserved. | |
4 | * Copyright (c) 2004 Intel Corporation. All rights reserved. | |
5 | * Copyright (c) 2004 Topspin Corporation. All rights reserved. | |
6 | * Copyright (c) 2004 Voltaire Corporation. All rights reserved. | |
7 | * | |
8 | * This software is available to you under a choice of one of two | |
9 | * licenses. You may choose to be licensed under the terms of the GNU | |
10 | * General Public License (GPL) Version 2, available from the file | |
11 | * COPYING in the main directory of this source tree, or the | |
12 | * OpenIB.org BSD license below: | |
13 | * | |
14 | * Redistribution and use in source and binary forms, with or | |
15 | * without modification, are permitted provided that the following | |
16 | * conditions are met: | |
17 | * | |
18 | * - Redistributions of source code must retain the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer. | |
21 | * | |
22 | * - Redistributions in binary form must reproduce the above | |
23 | * copyright notice, this list of conditions and the following | |
24 | * disclaimer in the documentation and/or other materials | |
25 | * provided with the distribution. | |
26 | * | |
27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
28 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
29 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
30 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
31 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
32 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
33 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
34 | * SOFTWARE. | |
35 | * | |
36 | * $Id: smi.c 1389 2004-12-27 22:56:47Z roland $ | |
37 | */ | |
38 | ||
39 | #include <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 | */ | |
46 | int smi_handle_dr_smp_send(struct ib_smp *smp, | |
47 | u8 node_type, | |
48 | int port_num) | |
49 | { | |
50 | u8 hop_ptr, hop_cnt; | |
51 | ||
52 | hop_ptr = smp->hop_ptr; | |
53 | hop_cnt = smp->hop_cnt; | |
54 | ||
55 | /* See section 14.2.2.2, Vol 1 IB spec */ | |
56 | if (!ib_get_smp_direction(smp)) { | |
57 | /* C14-9:1 */ | |
58 | if (hop_cnt && hop_ptr == 0) { | |
59 | smp->hop_ptr++; | |
60 | return (smp->initial_path[smp->hop_ptr] == | |
61 | port_num); | |
62 | } | |
63 | ||
64 | /* C14-9:2 */ | |
65 | if (hop_ptr && hop_ptr < hop_cnt) { | |
66 | if (node_type != IB_NODE_SWITCH) | |
67 | return 0; | |
68 | ||
69 | /* smp->return_path set when received */ | |
70 | smp->hop_ptr++; | |
71 | return (smp->initial_path[smp->hop_ptr] == | |
72 | port_num); | |
73 | } | |
74 | ||
75 | /* C14-9:3 -- We're at the end of the DR segment of path */ | |
76 | if (hop_ptr == hop_cnt) { | |
77 | /* smp->return_path set when received */ | |
78 | smp->hop_ptr++; | |
79 | return (node_type == IB_NODE_SWITCH || | |
80 | smp->dr_dlid == IB_LID_PERMISSIVE); | |
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); | |
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); | |
93 | } | |
94 | ||
95 | /* C14-13:2 */ | |
96 | if (2 <= hop_ptr && hop_ptr <= hop_cnt) { | |
97 | if (node_type != IB_NODE_SWITCH) | |
98 | return 0; | |
99 | ||
100 | smp->hop_ptr--; | |
101 | return (smp->return_path[smp->hop_ptr] == | |
102 | port_num); | |
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 == IB_NODE_SWITCH || | |
110 | smp->dr_slid == IB_LID_PERMISSIVE); | |
111 | } | |
112 | ||
113 | /* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */ | |
114 | if (hop_ptr == 0) | |
115 | return 1; | |
116 | ||
117 | /* C14-13:5 -- Check for unreasonable hop pointer */ | |
118 | return 0; | |
119 | } | |
120 | } | |
121 | ||
122 | /* | |
123 | * Adjust information for a received SMP | |
124 | * Return 0 if the SMP should be dropped | |
125 | */ | |
126 | int smi_handle_dr_smp_recv(struct ib_smp *smp, | |
127 | u8 node_type, | |
128 | int port_num, | |
129 | int phys_port_cnt) | |
130 | { | |
131 | u8 hop_ptr, hop_cnt; | |
132 | ||
133 | hop_ptr = smp->hop_ptr; | |
134 | hop_cnt = smp->hop_cnt; | |
135 | ||
136 | /* See section 14.2.2.2, Vol 1 IB spec */ | |
137 | if (!ib_get_smp_direction(smp)) { | |
138 | /* C14-9:1 -- sender should have incremented hop_ptr */ | |
139 | if (hop_cnt && hop_ptr == 0) | |
140 | return 0; | |
141 | ||
142 | /* C14-9:2 -- intermediate hop */ | |
143 | if (hop_ptr && hop_ptr < hop_cnt) { | |
144 | if (node_type != IB_NODE_SWITCH) | |
145 | return 0; | |
146 | ||
147 | smp->return_path[hop_ptr] = port_num; | |
148 | /* smp->hop_ptr updated when sending */ | |
149 | return (smp->initial_path[hop_ptr+1] <= phys_port_cnt); | |
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 == IB_NODE_SWITCH || | |
159 | smp->dr_dlid == IB_LID_PERMISSIVE); | |
160 | } | |
161 | ||
162 | /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ | |
163 | /* C14-9:5 -- fail unreasonable hop pointer */ | |
164 | return (hop_ptr == hop_cnt + 1); | |
165 | ||
166 | } else { | |
167 | ||
168 | /* C14-13:1 */ | |
169 | if (hop_cnt && hop_ptr == hop_cnt + 1) { | |
170 | smp->hop_ptr--; | |
171 | return (smp->return_path[smp->hop_ptr] == | |
172 | port_num); | |
173 | } | |
174 | ||
175 | /* C14-13:2 */ | |
176 | if (2 <= hop_ptr && hop_ptr <= hop_cnt) { | |
177 | if (node_type != IB_NODE_SWITCH) | |
178 | return 0; | |
179 | ||
180 | /* smp->hop_ptr updated when sending */ | |
181 | return (smp->return_path[hop_ptr-1] <= phys_port_cnt); | |
182 | } | |
183 | ||
184 | /* C14-13:3 -- We're at the end of the DR segment of path */ | |
185 | if (hop_ptr == 1) { | |
186 | if (smp->dr_slid == IB_LID_PERMISSIVE) { | |
187 | /* giving SMP to SM - update hop_ptr */ | |
188 | smp->hop_ptr--; | |
189 | return 1; | |
190 | } | |
191 | /* smp->hop_ptr updated when sending */ | |
192 | return (node_type == IB_NODE_SWITCH); | |
193 | } | |
194 | ||
195 | /* C14-13:4 -- hop_ptr = 0 -> give to SM */ | |
196 | /* C14-13:5 -- Check for unreasonable hop pointer */ | |
197 | return (hop_ptr == 0); | |
198 | } | |
199 | } | |
200 | ||
201 | /* | |
202 | * Return 1 if the received DR SMP should be forwarded to the send queue | |
203 | * Return 0 if the SMP should be completed up the stack | |
204 | */ | |
205 | int smi_check_forward_dr_smp(struct ib_smp *smp) | |
206 | { | |
207 | u8 hop_ptr, hop_cnt; | |
208 | ||
209 | hop_ptr = smp->hop_ptr; | |
210 | hop_cnt = smp->hop_cnt; | |
211 | ||
212 | if (!ib_get_smp_direction(smp)) { | |
213 | /* C14-9:2 -- intermediate hop */ | |
214 | if (hop_ptr && hop_ptr < hop_cnt) | |
215 | return 1; | |
216 | ||
217 | /* C14-9:3 -- at the end of the DR segment of path */ | |
218 | if (hop_ptr == hop_cnt) | |
219 | return (smp->dr_dlid == IB_LID_PERMISSIVE); | |
220 | ||
221 | /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */ | |
222 | if (hop_ptr == hop_cnt + 1) | |
223 | return 1; | |
224 | } else { | |
225 | /* C14-13:2 */ | |
226 | if (2 <= hop_ptr && hop_ptr <= hop_cnt) | |
227 | return 1; | |
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 | } | |
233 | return 0; | |
234 | } |