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.
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:
15 * Redistribution and use in source and binary forms, with or
16 * without modification, are permitted provided that the following
19 * - Redistributions of source code must retain the above
20 * copyright notice, this list of conditions and the following
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.
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
39 #include <rdma/ib_smi.h>
43 * Fixup a directed route SMP for sending
44 * Return 0 if the SMP should be discarded
46 enum smi_action
smi_handle_dr_smp_send(struct ib_smp
*smp
,
47 u8 node_type
, int port_num
)
51 hop_ptr
= smp
->hop_ptr
;
52 hop_cnt
= smp
->hop_cnt
;
54 /* See section 14.2.2.2, Vol 1 IB spec */
55 /* C14-6 -- valid hop_cnt values are from 0 to 63 */
56 if (hop_cnt
>= IB_SMP_MAX_PATH_HOPS
)
57 return IB_SMI_DISCARD
;
59 if (!ib_get_smp_direction(smp
)) {
61 if (hop_cnt
&& hop_ptr
== 0) {
63 return (smp
->initial_path
[smp
->hop_ptr
] ==
64 port_num
? IB_SMI_HANDLE
: IB_SMI_DISCARD
);
68 if (hop_ptr
&& hop_ptr
< hop_cnt
) {
69 if (node_type
!= RDMA_NODE_IB_SWITCH
)
70 return IB_SMI_DISCARD
;
72 /* smp->return_path set when received */
74 return (smp
->initial_path
[smp
->hop_ptr
] ==
75 port_num
? IB_SMI_HANDLE
: IB_SMI_DISCARD
);
78 /* C14-9:3 -- We're at the end of the DR segment of path */
79 if (hop_ptr
== hop_cnt
) {
80 /* smp->return_path set when received */
82 return (node_type
== RDMA_NODE_IB_SWITCH
||
83 smp
->dr_dlid
== IB_LID_PERMISSIVE
?
84 IB_SMI_HANDLE
: IB_SMI_DISCARD
);
87 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
88 /* C14-9:5 -- Fail unreasonable hop pointer */
89 return (hop_ptr
== hop_cnt
+ 1 ? IB_SMI_HANDLE
: IB_SMI_DISCARD
);
93 if (hop_cnt
&& hop_ptr
== hop_cnt
+ 1) {
95 return (smp
->return_path
[smp
->hop_ptr
] ==
96 port_num
? IB_SMI_HANDLE
: IB_SMI_DISCARD
);
100 if (2 <= hop_ptr
&& hop_ptr
<= hop_cnt
) {
101 if (node_type
!= RDMA_NODE_IB_SWITCH
)
102 return IB_SMI_DISCARD
;
105 return (smp
->return_path
[smp
->hop_ptr
] ==
106 port_num
? IB_SMI_HANDLE
: IB_SMI_DISCARD
);
109 /* C14-13:3 -- at the end of the DR segment of path */
112 /* C14-13:3 -- SMPs destined for SM shouldn't be here */
113 return (node_type
== RDMA_NODE_IB_SWITCH
||
114 smp
->dr_slid
== IB_LID_PERMISSIVE
?
115 IB_SMI_HANDLE
: IB_SMI_DISCARD
);
118 /* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */
120 return IB_SMI_HANDLE
;
122 /* C14-13:5 -- Check for unreasonable hop pointer */
123 return IB_SMI_DISCARD
;
128 * Adjust information for a received SMP
129 * Return 0 if the SMP should be dropped
131 enum smi_action
smi_handle_dr_smp_recv(struct ib_smp
*smp
, u8 node_type
,
132 int port_num
, int phys_port_cnt
)
136 hop_ptr
= smp
->hop_ptr
;
137 hop_cnt
= smp
->hop_cnt
;
139 /* See section 14.2.2.2, Vol 1 IB spec */
140 /* C14-6 -- valid hop_cnt values are from 0 to 63 */
141 if (hop_cnt
>= IB_SMP_MAX_PATH_HOPS
)
142 return IB_SMI_DISCARD
;
144 if (!ib_get_smp_direction(smp
)) {
145 /* C14-9:1 -- sender should have incremented hop_ptr */
146 if (hop_cnt
&& hop_ptr
== 0)
147 return IB_SMI_DISCARD
;
149 /* C14-9:2 -- intermediate hop */
150 if (hop_ptr
&& hop_ptr
< hop_cnt
) {
151 if (node_type
!= RDMA_NODE_IB_SWITCH
)
152 return IB_SMI_DISCARD
;
154 smp
->return_path
[hop_ptr
] = port_num
;
155 /* smp->hop_ptr updated when sending */
156 return (smp
->initial_path
[hop_ptr
+1] <= phys_port_cnt
?
157 IB_SMI_HANDLE
: IB_SMI_DISCARD
);
160 /* C14-9:3 -- We're at the end of the DR segment of path */
161 if (hop_ptr
== hop_cnt
) {
163 smp
->return_path
[hop_ptr
] = port_num
;
164 /* smp->hop_ptr updated when sending */
166 return (node_type
== RDMA_NODE_IB_SWITCH
||
167 smp
->dr_dlid
== IB_LID_PERMISSIVE
?
168 IB_SMI_HANDLE
: IB_SMI_DISCARD
);
171 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
172 /* C14-9:5 -- fail unreasonable hop pointer */
173 return (hop_ptr
== hop_cnt
+ 1 ? IB_SMI_HANDLE
: IB_SMI_DISCARD
);
178 if (hop_cnt
&& hop_ptr
== hop_cnt
+ 1) {
180 return (smp
->return_path
[smp
->hop_ptr
] ==
181 port_num
? IB_SMI_HANDLE
: IB_SMI_DISCARD
);
185 if (2 <= hop_ptr
&& hop_ptr
<= hop_cnt
) {
186 if (node_type
!= RDMA_NODE_IB_SWITCH
)
187 return IB_SMI_DISCARD
;
189 /* smp->hop_ptr updated when sending */
190 return (smp
->return_path
[hop_ptr
-1] <= phys_port_cnt
?
191 IB_SMI_HANDLE
: IB_SMI_DISCARD
);
194 /* C14-13:3 -- We're at the end of the DR segment of path */
196 if (smp
->dr_slid
== IB_LID_PERMISSIVE
) {
197 /* giving SMP to SM - update hop_ptr */
199 return IB_SMI_HANDLE
;
201 /* smp->hop_ptr updated when sending */
202 return (node_type
== RDMA_NODE_IB_SWITCH
?
203 IB_SMI_HANDLE
: IB_SMI_DISCARD
);
206 /* C14-13:4 -- hop_ptr = 0 -> give to SM */
207 /* C14-13:5 -- Check for unreasonable hop pointer */
208 return (hop_ptr
== 0 ? IB_SMI_HANDLE
: IB_SMI_DISCARD
);
212 enum smi_forward_action
smi_check_forward_dr_smp(struct ib_smp
*smp
)
216 hop_ptr
= smp
->hop_ptr
;
217 hop_cnt
= smp
->hop_cnt
;
219 if (!ib_get_smp_direction(smp
)) {
220 /* C14-9:2 -- intermediate hop */
221 if (hop_ptr
&& hop_ptr
< hop_cnt
)
222 return IB_SMI_FORWARD
;
224 /* C14-9:3 -- at the end of the DR segment of path */
225 if (hop_ptr
== hop_cnt
)
226 return (smp
->dr_dlid
== IB_LID_PERMISSIVE
?
227 IB_SMI_SEND
: IB_SMI_LOCAL
);
229 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
230 if (hop_ptr
== hop_cnt
+ 1)
233 /* C14-13:2 -- intermediate hop */
234 if (2 <= hop_ptr
&& hop_ptr
<= hop_cnt
)
235 return IB_SMI_FORWARD
;
237 /* C14-13:3 -- at the end of the DR segment of path */
239 return (smp
->dr_slid
!= IB_LID_PERMISSIVE
?
240 IB_SMI_SEND
: IB_SMI_LOCAL
);
246 * Return the forwarding port number from initial_path for outgoing SMP and
247 * from return_path for returning SMP
249 int smi_get_fwd_port(struct ib_smp
*smp
)
251 return (!ib_get_smp_direction(smp
) ? smp
->initial_path
[smp
->hop_ptr
+1] :
252 smp
->return_path
[smp
->hop_ptr
-1]);
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