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 * Copyright (c) 2014 Intel Corporation. All rights reserved.
9 *
10 * This software is available to you under a choice of one of two
11 * licenses. You may choose to be licensed under the terms of the GNU
12 * General Public License (GPL) Version 2, available from the file
13 * COPYING in the main directory of this source tree, or the
14 * OpenIB.org BSD license below:
15 *
16 * Redistribution and use in source and binary forms, with or
17 * without modification, are permitted provided that the following
18 * conditions are met:
19 *
20 * - Redistributions of source code must retain the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer.
23 *
24 * - Redistributions in binary form must reproduce the above
25 * copyright notice, this list of conditions and the following
26 * disclaimer in the documentation and/or other materials
27 * provided with the distribution.
28 *
29 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
30 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
31 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
32 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
33 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
34 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
35 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
36 * SOFTWARE.
37 *
38 */
39
40 #include <rdma/ib_smi.h>
41 #include "smi.h"
42 #include "opa_smi.h"
43
44 static enum smi_action __smi_handle_dr_smp_send(bool is_switch, int port_num,
45 u8 *hop_ptr, u8 hop_cnt,
46 const u8 *initial_path,
47 const u8 *return_path,
48 u8 direction,
49 bool dr_dlid_is_permissive,
50 bool dr_slid_is_permissive)
51 {
52 /* See section 14.2.2.2, Vol 1 IB spec */
53 /* C14-6 -- valid hop_cnt values are from 0 to 63 */
54 if (hop_cnt >= IB_SMP_MAX_PATH_HOPS)
55 return IB_SMI_DISCARD;
56
57 if (!direction) {
58 /* C14-9:1 */
59 if (hop_cnt && *hop_ptr == 0) {
60 (*hop_ptr)++;
61 return (initial_path[*hop_ptr] ==
62 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
63 }
64
65 /* C14-9:2 */
66 if (*hop_ptr && *hop_ptr < hop_cnt) {
67 if (!is_switch)
68 return IB_SMI_DISCARD;
69
70 /* return_path set when received */
71 (*hop_ptr)++;
72 return (initial_path[*hop_ptr] ==
73 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
74 }
75
76 /* C14-9:3 -- We're at the end of the DR segment of path */
77 if (*hop_ptr == hop_cnt) {
78 /* return_path set when received */
79 (*hop_ptr)++;
80 return (is_switch ||
81 dr_dlid_is_permissive ?
82 IB_SMI_HANDLE : IB_SMI_DISCARD);
83 }
84
85 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
86 /* C14-9:5 -- Fail unreasonable hop pointer */
87 return (*hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
88
89 } else {
90 /* C14-13:1 */
91 if (hop_cnt && *hop_ptr == hop_cnt + 1) {
92 (*hop_ptr)--;
93 return (return_path[*hop_ptr] ==
94 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
95 }
96
97 /* C14-13:2 */
98 if (2 <= *hop_ptr && *hop_ptr <= hop_cnt) {
99 if (!is_switch)
100 return IB_SMI_DISCARD;
101
102 (*hop_ptr)--;
103 return (return_path[*hop_ptr] ==
104 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
105 }
106
107 /* C14-13:3 -- at the end of the DR segment of path */
108 if (*hop_ptr == 1) {
109 (*hop_ptr)--;
110 /* C14-13:3 -- SMPs destined for SM shouldn't be here */
111 return (is_switch ||
112 dr_slid_is_permissive ?
113 IB_SMI_HANDLE : IB_SMI_DISCARD);
114 }
115
116 /* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */
117 if (*hop_ptr == 0)
118 return IB_SMI_HANDLE;
119
120 /* C14-13:5 -- Check for unreasonable hop pointer */
121 return IB_SMI_DISCARD;
122 }
123 }
124
125 /*
126 * Fixup a directed route SMP for sending
127 * Return IB_SMI_DISCARD if the SMP should be discarded
128 */
129 enum smi_action smi_handle_dr_smp_send(struct ib_smp *smp,
130 bool is_switch, int port_num)
131 {
132 return __smi_handle_dr_smp_send(is_switch, port_num,
133 &smp->hop_ptr, smp->hop_cnt,
134 smp->initial_path,
135 smp->return_path,
136 ib_get_smp_direction(smp),
137 smp->dr_dlid == IB_LID_PERMISSIVE,
138 smp->dr_slid == IB_LID_PERMISSIVE);
139 }
140
141 enum smi_action opa_smi_handle_dr_smp_send(struct opa_smp *smp,
142 bool is_switch, int port_num)
143 {
144 return __smi_handle_dr_smp_send(is_switch, port_num,
145 &smp->hop_ptr, smp->hop_cnt,
146 smp->route.dr.initial_path,
147 smp->route.dr.return_path,
148 opa_get_smp_direction(smp),
149 smp->route.dr.dr_dlid ==
150 OPA_LID_PERMISSIVE,
151 smp->route.dr.dr_slid ==
152 OPA_LID_PERMISSIVE);
153 }
154
155 static enum smi_action __smi_handle_dr_smp_recv(bool is_switch, int port_num,
156 int phys_port_cnt,
157 u8 *hop_ptr, u8 hop_cnt,
158 const u8 *initial_path,
159 u8 *return_path,
160 u8 direction,
161 bool dr_dlid_is_permissive,
162 bool dr_slid_is_permissive)
163 {
164 /* See section 14.2.2.2, Vol 1 IB spec */
165 /* C14-6 -- valid hop_cnt values are from 0 to 63 */
166 if (hop_cnt >= IB_SMP_MAX_PATH_HOPS)
167 return IB_SMI_DISCARD;
168
169 if (!direction) {
170 /* C14-9:1 -- sender should have incremented hop_ptr */
171 if (hop_cnt && *hop_ptr == 0)
172 return IB_SMI_DISCARD;
173
174 /* C14-9:2 -- intermediate hop */
175 if (*hop_ptr && *hop_ptr < hop_cnt) {
176 if (!is_switch)
177 return IB_SMI_DISCARD;
178
179 return_path[*hop_ptr] = port_num;
180 /* hop_ptr updated when sending */
181 return (initial_path[*hop_ptr+1] <= phys_port_cnt ?
182 IB_SMI_HANDLE : IB_SMI_DISCARD);
183 }
184
185 /* C14-9:3 -- We're at the end of the DR segment of path */
186 if (*hop_ptr == hop_cnt) {
187 if (hop_cnt)
188 return_path[*hop_ptr] = port_num;
189 /* hop_ptr updated when sending */
190
191 return (is_switch ||
192 dr_dlid_is_permissive ?
193 IB_SMI_HANDLE : IB_SMI_DISCARD);
194 }
195
196 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
197 /* C14-9:5 -- fail unreasonable hop pointer */
198 return (*hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
199
200 } else {
201
202 /* C14-13:1 */
203 if (hop_cnt && *hop_ptr == hop_cnt + 1) {
204 (*hop_ptr)--;
205 return (return_path[*hop_ptr] ==
206 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
207 }
208
209 /* C14-13:2 */
210 if (2 <= *hop_ptr && *hop_ptr <= hop_cnt) {
211 if (!is_switch)
212 return IB_SMI_DISCARD;
213
214 /* hop_ptr updated when sending */
215 return (return_path[*hop_ptr-1] <= phys_port_cnt ?
216 IB_SMI_HANDLE : IB_SMI_DISCARD);
217 }
218
219 /* C14-13:3 -- We're at the end of the DR segment of path */
220 if (*hop_ptr == 1) {
221 if (dr_slid_is_permissive) {
222 /* giving SMP to SM - update hop_ptr */
223 (*hop_ptr)--;
224 return IB_SMI_HANDLE;
225 }
226 /* hop_ptr updated when sending */
227 return (is_switch ? IB_SMI_HANDLE : IB_SMI_DISCARD);
228 }
229
230 /* C14-13:4 -- hop_ptr = 0 -> give to SM */
231 /* C14-13:5 -- Check for unreasonable hop pointer */
232 return (*hop_ptr == 0 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
233 }
234 }
235
236 /*
237 * Adjust information for a received SMP
238 * Return IB_SMI_DISCARD if the SMP should be dropped
239 */
240 enum smi_action smi_handle_dr_smp_recv(struct ib_smp *smp, bool is_switch,
241 int port_num, int phys_port_cnt)
242 {
243 return __smi_handle_dr_smp_recv(is_switch, port_num, phys_port_cnt,
244 &smp->hop_ptr, smp->hop_cnt,
245 smp->initial_path,
246 smp->return_path,
247 ib_get_smp_direction(smp),
248 smp->dr_dlid == IB_LID_PERMISSIVE,
249 smp->dr_slid == IB_LID_PERMISSIVE);
250 }
251
252 /*
253 * Adjust information for a received SMP
254 * Return IB_SMI_DISCARD if the SMP should be dropped
255 */
256 enum smi_action opa_smi_handle_dr_smp_recv(struct opa_smp *smp, bool is_switch,
257 int port_num, int phys_port_cnt)
258 {
259 return __smi_handle_dr_smp_recv(is_switch, port_num, phys_port_cnt,
260 &smp->hop_ptr, smp->hop_cnt,
261 smp->route.dr.initial_path,
262 smp->route.dr.return_path,
263 opa_get_smp_direction(smp),
264 smp->route.dr.dr_dlid ==
265 OPA_LID_PERMISSIVE,
266 smp->route.dr.dr_slid ==
267 OPA_LID_PERMISSIVE);
268 }
269
270 static enum smi_forward_action __smi_check_forward_dr_smp(u8 hop_ptr, u8 hop_cnt,
271 u8 direction,
272 bool dr_dlid_is_permissive,
273 bool dr_slid_is_permissive)
274 {
275 if (!direction) {
276 /* C14-9:2 -- intermediate hop */
277 if (hop_ptr && hop_ptr < hop_cnt)
278 return IB_SMI_FORWARD;
279
280 /* C14-9:3 -- at the end of the DR segment of path */
281 if (hop_ptr == hop_cnt)
282 return (dr_dlid_is_permissive ?
283 IB_SMI_SEND : IB_SMI_LOCAL);
284
285 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
286 if (hop_ptr == hop_cnt + 1)
287 return IB_SMI_SEND;
288 } else {
289 /* C14-13:2 -- intermediate hop */
290 if (2 <= hop_ptr && hop_ptr <= hop_cnt)
291 return IB_SMI_FORWARD;
292
293 /* C14-13:3 -- at the end of the DR segment of path */
294 if (hop_ptr == 1)
295 return (!dr_slid_is_permissive ?
296 IB_SMI_SEND : IB_SMI_LOCAL);
297 }
298 return IB_SMI_LOCAL;
299
300 }
301
302 enum smi_forward_action smi_check_forward_dr_smp(struct ib_smp *smp)
303 {
304 return __smi_check_forward_dr_smp(smp->hop_ptr, smp->hop_cnt,
305 ib_get_smp_direction(smp),
306 smp->dr_dlid == IB_LID_PERMISSIVE,
307 smp->dr_slid == IB_LID_PERMISSIVE);
308 }
309
310 enum smi_forward_action opa_smi_check_forward_dr_smp(struct opa_smp *smp)
311 {
312 return __smi_check_forward_dr_smp(smp->hop_ptr, smp->hop_cnt,
313 opa_get_smp_direction(smp),
314 smp->route.dr.dr_dlid ==
315 OPA_LID_PERMISSIVE,
316 smp->route.dr.dr_slid ==
317 OPA_LID_PERMISSIVE);
318 }
319
320 /*
321 * Return the forwarding port number from initial_path for outgoing SMP and
322 * from return_path for returning SMP
323 */
324 int smi_get_fwd_port(struct ib_smp *smp)
325 {
326 return (!ib_get_smp_direction(smp) ? smp->initial_path[smp->hop_ptr+1] :
327 smp->return_path[smp->hop_ptr-1]);
328 }
329
330 /*
331 * Return the forwarding port number from initial_path for outgoing SMP and
332 * from return_path for returning SMP
333 */
334 int opa_smi_get_fwd_port(struct opa_smp *smp)
335 {
336 return !opa_get_smp_direction(smp) ? smp->route.dr.initial_path[smp->hop_ptr+1] :
337 smp->route.dr.return_path[smp->hop_ptr-1];
338 }