Merge remote-tracking branch 'asoc/topic/core' into asoc-next
[linux-2.6-block.git] / drivers / infiniband / core / smi.c
CommitLineData
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.
de493d47 6 * Copyright (c) 2004-2007 Voltaire Corporation. All rights reserved.
2a1d9b7f 7 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
f28990bc 8 * Copyright (c) 2014 Intel Corporation. All rights reserved.
1da177e4
LT
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 *
1da177e4
LT
38 */
39
a4d61e84 40#include <rdma/ib_smi.h>
1da177e4 41#include "smi.h"
f28990bc 42#include "opa_smi.h"
1da177e4 43
4139032b 44static enum smi_action __smi_handle_dr_smp_send(bool is_switch, int port_num,
92f15056
IW
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)
1da177e4 51{
1da177e4 52 /* See section 14.2.2.2, Vol 1 IB spec */
60f2b652
RD
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
92f15056 57 if (!direction) {
1da177e4 58 /* C14-9:1 */
92f15056
IW
59 if (hop_cnt && *hop_ptr == 0) {
60 (*hop_ptr)++;
61 return (initial_path[*hop_ptr] ==
de493d47 62 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4
LT
63 }
64
65 /* C14-9:2 */
92f15056 66 if (*hop_ptr && *hop_ptr < hop_cnt) {
4139032b 67 if (!is_switch)
de493d47 68 return IB_SMI_DISCARD;
1da177e4 69
92f15056
IW
70 /* return_path set when received */
71 (*hop_ptr)++;
72 return (initial_path[*hop_ptr] ==
de493d47 73 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4
LT
74 }
75
76 /* C14-9:3 -- We're at the end of the DR segment of path */
92f15056
IW
77 if (*hop_ptr == hop_cnt) {
78 /* return_path set when received */
79 (*hop_ptr)++;
4139032b 80 return (is_switch ||
92f15056 81 dr_dlid_is_permissive ?
de493d47 82 IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4
LT
83 }
84
85 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
86 /* C14-9:5 -- Fail unreasonable hop pointer */
92f15056 87 return (*hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4
LT
88
89 } else {
90 /* C14-13:1 */
92f15056
IW
91 if (hop_cnt && *hop_ptr == hop_cnt + 1) {
92 (*hop_ptr)--;
93 return (return_path[*hop_ptr] ==
de493d47 94 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4
LT
95 }
96
97 /* C14-13:2 */
92f15056 98 if (2 <= *hop_ptr && *hop_ptr <= hop_cnt) {
4139032b 99 if (!is_switch)
de493d47 100 return IB_SMI_DISCARD;
1da177e4 101
92f15056
IW
102 (*hop_ptr)--;
103 return (return_path[*hop_ptr] ==
de493d47 104 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4
LT
105 }
106
107 /* C14-13:3 -- at the end of the DR segment of path */
92f15056
IW
108 if (*hop_ptr == 1) {
109 (*hop_ptr)--;
1da177e4 110 /* C14-13:3 -- SMPs destined for SM shouldn't be here */
4139032b 111 return (is_switch ||
92f15056 112 dr_slid_is_permissive ?
de493d47 113 IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4
LT
114 }
115
116 /* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */
92f15056 117 if (*hop_ptr == 0)
de493d47 118 return IB_SMI_HANDLE;
1da177e4
LT
119
120 /* C14-13:5 -- Check for unreasonable hop pointer */
de493d47 121 return IB_SMI_DISCARD;
1da177e4
LT
122 }
123}
124
92f15056
IW
125/*
126 * Fixup a directed route SMP for sending
127 * Return IB_SMI_DISCARD if the SMP should be discarded
128 */
129enum smi_action smi_handle_dr_smp_send(struct ib_smp *smp,
4139032b 130 bool is_switch, int port_num)
92f15056 131{
4139032b 132 return __smi_handle_dr_smp_send(is_switch, port_num,
92f15056
IW
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
f28990bc 141enum smi_action opa_smi_handle_dr_smp_send(struct opa_smp *smp,
4139032b 142 bool is_switch, int port_num)
f28990bc 143{
4139032b 144 return __smi_handle_dr_smp_send(is_switch, port_num,
f28990bc
IW
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
4139032b 155static enum smi_action __smi_handle_dr_smp_recv(bool is_switch, int port_num,
86f0e67a
IW
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)
1da177e4 163{
1da177e4 164 /* See section 14.2.2.2, Vol 1 IB spec */
60f2b652
RD
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
86f0e67a 169 if (!direction) {
1da177e4 170 /* C14-9:1 -- sender should have incremented hop_ptr */
86f0e67a 171 if (hop_cnt && *hop_ptr == 0)
de493d47 172 return IB_SMI_DISCARD;
1da177e4
LT
173
174 /* C14-9:2 -- intermediate hop */
86f0e67a 175 if (*hop_ptr && *hop_ptr < hop_cnt) {
4139032b 176 if (!is_switch)
de493d47 177 return IB_SMI_DISCARD;
1da177e4 178
86f0e67a
IW
179 return_path[*hop_ptr] = port_num;
180 /* hop_ptr updated when sending */
181 return (initial_path[*hop_ptr+1] <= phys_port_cnt ?
de493d47 182 IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4
LT
183 }
184
185 /* C14-9:3 -- We're at the end of the DR segment of path */
86f0e67a 186 if (*hop_ptr == hop_cnt) {
1da177e4 187 if (hop_cnt)
86f0e67a
IW
188 return_path[*hop_ptr] = port_num;
189 /* hop_ptr updated when sending */
1da177e4 190
4139032b 191 return (is_switch ||
86f0e67a 192 dr_dlid_is_permissive ?
de493d47 193 IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4
LT
194 }
195
196 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
197 /* C14-9:5 -- fail unreasonable hop pointer */
86f0e67a 198 return (*hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4
LT
199
200 } else {
201
202 /* C14-13:1 */
86f0e67a
IW
203 if (hop_cnt && *hop_ptr == hop_cnt + 1) {
204 (*hop_ptr)--;
205 return (return_path[*hop_ptr] ==
de493d47 206 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4
LT
207 }
208
209 /* C14-13:2 */
86f0e67a 210 if (2 <= *hop_ptr && *hop_ptr <= hop_cnt) {
4139032b 211 if (!is_switch)
de493d47 212 return IB_SMI_DISCARD;
1da177e4 213
86f0e67a
IW
214 /* hop_ptr updated when sending */
215 return (return_path[*hop_ptr-1] <= phys_port_cnt ?
de493d47 216 IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4
LT
217 }
218
219 /* C14-13:3 -- We're at the end of the DR segment of path */
86f0e67a
IW
220 if (*hop_ptr == 1) {
221 if (dr_slid_is_permissive) {
1da177e4 222 /* giving SMP to SM - update hop_ptr */
86f0e67a 223 (*hop_ptr)--;
de493d47 224 return IB_SMI_HANDLE;
1da177e4 225 }
86f0e67a 226 /* hop_ptr updated when sending */
4139032b 227 return (is_switch ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4
LT
228 }
229
230 /* C14-13:4 -- hop_ptr = 0 -> give to SM */
231 /* C14-13:5 -- Check for unreasonable hop pointer */
86f0e67a 232 return (*hop_ptr == 0 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4
LT
233 }
234}
235
86f0e67a
IW
236/*
237 * Adjust information for a received SMP
238 * Return IB_SMI_DISCARD if the SMP should be dropped
239 */
4139032b 240enum smi_action smi_handle_dr_smp_recv(struct ib_smp *smp, bool is_switch,
86f0e67a
IW
241 int port_num, int phys_port_cnt)
242{
4139032b 243 return __smi_handle_dr_smp_recv(is_switch, port_num, phys_port_cnt,
86f0e67a
IW
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
f28990bc
IW
252/*
253 * Adjust information for a received SMP
254 * Return IB_SMI_DISCARD if the SMP should be dropped
255 */
4139032b 256enum smi_action opa_smi_handle_dr_smp_recv(struct opa_smp *smp, bool is_switch,
f28990bc
IW
257 int port_num, int phys_port_cnt)
258{
4139032b 259 return __smi_handle_dr_smp_recv(is_switch, port_num, phys_port_cnt,
f28990bc
IW
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
29869eaf
IW
270static 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)
1da177e4 274{
29869eaf 275 if (!direction) {
1da177e4
LT
276 /* C14-9:2 -- intermediate hop */
277 if (hop_ptr && hop_ptr < hop_cnt)
1bae4dbf 278 return IB_SMI_FORWARD;
1da177e4
LT
279
280 /* C14-9:3 -- at the end of the DR segment of path */
281 if (hop_ptr == hop_cnt)
29869eaf 282 return (dr_dlid_is_permissive ?
de493d47 283 IB_SMI_SEND : IB_SMI_LOCAL);
1da177e4
LT
284
285 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
286 if (hop_ptr == hop_cnt + 1)
de493d47 287 return IB_SMI_SEND;
1da177e4 288 } else {
de493d47 289 /* C14-13:2 -- intermediate hop */
1da177e4 290 if (2 <= hop_ptr && hop_ptr <= hop_cnt)
1bae4dbf 291 return IB_SMI_FORWARD;
1da177e4
LT
292
293 /* C14-13:3 -- at the end of the DR segment of path */
294 if (hop_ptr == 1)
29869eaf 295 return (!dr_slid_is_permissive ?
de493d47 296 IB_SMI_SEND : IB_SMI_LOCAL);
1da177e4 297 }
de493d47 298 return IB_SMI_LOCAL;
29869eaf
IW
299
300}
301
302enum 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);
1da177e4 308}
1bae4dbf 309
f28990bc
IW
310enum 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
1bae4dbf
HR
320/*
321 * Return the forwarding port number from initial_path for outgoing SMP and
322 * from return_path for returning SMP
323 */
324int 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}
f28990bc
IW
329
330/*
331 * Return the forwarding port number from initial_path for outgoing SMP and
332 * from return_path for returning SMP
333 */
334int 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}