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
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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
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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 if (!ib_get_smp_direction(smp)) {
57 if (hop_cnt && hop_ptr == 0) {
59 return (smp->initial_path[smp->hop_ptr] ==
60 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
64 if (hop_ptr && hop_ptr < hop_cnt) {
65 if (node_type != RDMA_NODE_IB_SWITCH)
66 return IB_SMI_DISCARD;
68 /* smp->return_path set when received */
70 return (smp->initial_path[smp->hop_ptr] ==
71 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
74 /* C14-9:3 -- We're at the end of the DR segment of path */
75 if (hop_ptr == hop_cnt) {
76 /* smp->return_path set when received */
78 return (node_type == RDMA_NODE_IB_SWITCH ||
79 smp->dr_dlid == IB_LID_PERMISSIVE ?
80 IB_SMI_HANDLE : IB_SMI_DISCARD);
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 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
89 if (hop_cnt && hop_ptr == hop_cnt + 1) {
91 return (smp->return_path[smp->hop_ptr] ==
92 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
96 if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
97 if (node_type != RDMA_NODE_IB_SWITCH)
98 return IB_SMI_DISCARD;
101 return (smp->return_path[smp->hop_ptr] ==
102 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
105 /* C14-13:3 -- at the end of the DR segment of path */
108 /* C14-13:3 -- SMPs destined for SM shouldn't be here */
109 return (node_type == RDMA_NODE_IB_SWITCH ||
110 smp->dr_slid == IB_LID_PERMISSIVE ?
111 IB_SMI_HANDLE : IB_SMI_DISCARD);
114 /* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */
116 return IB_SMI_HANDLE;
118 /* C14-13:5 -- Check for unreasonable hop pointer */
119 return IB_SMI_DISCARD;
124 * Adjust information for a received SMP
125 * Return 0 if the SMP should be dropped
127 enum smi_action smi_handle_dr_smp_recv(struct ib_smp *smp, u8 node_type,
128 int port_num, int phys_port_cnt)
132 hop_ptr = smp->hop_ptr;
133 hop_cnt = smp->hop_cnt;
135 /* See section 14.2.2.2, Vol 1 IB spec */
136 if (!ib_get_smp_direction(smp)) {
137 /* C14-9:1 -- sender should have incremented hop_ptr */
138 if (hop_cnt && hop_ptr == 0)
139 return IB_SMI_DISCARD;
141 /* C14-9:2 -- intermediate hop */
142 if (hop_ptr && hop_ptr < hop_cnt) {
143 if (node_type != RDMA_NODE_IB_SWITCH)
144 return IB_SMI_DISCARD;
146 smp->return_path[hop_ptr] = port_num;
147 /* smp->hop_ptr updated when sending */
148 return (smp->initial_path[hop_ptr+1] <= phys_port_cnt ?
149 IB_SMI_HANDLE : IB_SMI_DISCARD);
152 /* C14-9:3 -- We're at the end of the DR segment of path */
153 if (hop_ptr == hop_cnt) {
155 smp->return_path[hop_ptr] = port_num;
156 /* smp->hop_ptr updated when sending */
158 return (node_type == RDMA_NODE_IB_SWITCH ||
159 smp->dr_dlid == IB_LID_PERMISSIVE ?
160 IB_SMI_HANDLE : IB_SMI_DISCARD);
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 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
170 if (hop_cnt && hop_ptr == hop_cnt + 1) {
172 return (smp->return_path[smp->hop_ptr] ==
173 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
177 if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
178 if (node_type != RDMA_NODE_IB_SWITCH)
179 return IB_SMI_DISCARD;
181 /* smp->hop_ptr updated when sending */
182 return (smp->return_path[hop_ptr-1] <= phys_port_cnt ?
183 IB_SMI_HANDLE : IB_SMI_DISCARD);
186 /* C14-13:3 -- We're at the end of the DR segment of path */
188 if (smp->dr_slid == IB_LID_PERMISSIVE) {
189 /* giving SMP to SM - update hop_ptr */
191 return IB_SMI_HANDLE;
193 /* smp->hop_ptr updated when sending */
194 return (node_type == RDMA_NODE_IB_SWITCH ?
195 IB_SMI_HANDLE : IB_SMI_DISCARD);
198 /* C14-13:4 -- hop_ptr = 0 -> give to SM */
199 /* C14-13:5 -- Check for unreasonable hop pointer */
200 return (hop_ptr == 0 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
204 enum smi_forward_action smi_check_forward_dr_smp(struct ib_smp *smp)
208 hop_ptr = smp->hop_ptr;
209 hop_cnt = smp->hop_cnt;
211 if (!ib_get_smp_direction(smp)) {
212 /* C14-9:2 -- intermediate hop */
213 if (hop_ptr && hop_ptr < hop_cnt)
214 return IB_SMI_FORWARD;
216 /* C14-9:3 -- at the end of the DR segment of path */
217 if (hop_ptr == hop_cnt)
218 return (smp->dr_dlid == IB_LID_PERMISSIVE ?
219 IB_SMI_SEND : IB_SMI_LOCAL);
221 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
222 if (hop_ptr == hop_cnt + 1)
225 /* C14-13:2 -- intermediate hop */
226 if (2 <= hop_ptr && hop_ptr <= hop_cnt)
227 return IB_SMI_FORWARD;
229 /* C14-13:3 -- at the end of the DR segment of path */
231 return (smp->dr_slid != IB_LID_PERMISSIVE ?
232 IB_SMI_SEND : IB_SMI_LOCAL);
238 * Return the forwarding port number from initial_path for outgoing SMP and
239 * from return_path for returning SMP
241 int smi_get_fwd_port(struct ib_smp *smp)
243 return (!ib_get_smp_direction(smp) ? smp->initial_path[smp->hop_ptr+1] :
244 smp->return_path[smp->hop_ptr-1]);