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, 2005 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
37 * $Id: smi.c 1389 2004-12-27 22:56:47Z roland $
40 #include <rdma/ib_smi.h>
44 * Fixup a directed route SMP for sending
45 * Return 0 if the SMP should be discarded
47 int smi_handle_dr_smp_send(struct ib_smp *smp,
53 hop_ptr = smp->hop_ptr;
54 hop_cnt = smp->hop_cnt;
56 /* See section 14.2.2.2, Vol 1 IB spec */
57 if (!ib_get_smp_direction(smp)) {
59 if (hop_cnt && hop_ptr == 0) {
61 return (smp->initial_path[smp->hop_ptr] ==
66 if (hop_ptr && hop_ptr < hop_cnt) {
67 if (node_type != IB_NODE_SWITCH)
70 /* smp->return_path set when received */
72 return (smp->initial_path[smp->hop_ptr] ==
76 /* C14-9:3 -- We're at the end of the DR segment of path */
77 if (hop_ptr == hop_cnt) {
78 /* smp->return_path set when received */
80 return (node_type == IB_NODE_SWITCH ||
81 smp->dr_dlid == IB_LID_PERMISSIVE);
84 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
85 /* C14-9:5 -- Fail unreasonable hop pointer */
86 return (hop_ptr == hop_cnt + 1);
90 if (hop_cnt && hop_ptr == hop_cnt + 1) {
92 return (smp->return_path[smp->hop_ptr] ==
97 if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
98 if (node_type != IB_NODE_SWITCH)
102 return (smp->return_path[smp->hop_ptr] ==
106 /* C14-13:3 -- at the end of the DR segment of path */
109 /* C14-13:3 -- SMPs destined for SM shouldn't be here */
110 return (node_type == IB_NODE_SWITCH ||
111 smp->dr_slid == IB_LID_PERMISSIVE);
114 /* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */
118 /* C14-13:5 -- Check for unreasonable hop pointer */
124 * Adjust information for a received SMP
125 * Return 0 if the SMP should be dropped
127 int smi_handle_dr_smp_recv(struct ib_smp *smp,
134 hop_ptr = smp->hop_ptr;
135 hop_cnt = smp->hop_cnt;
137 /* See section 14.2.2.2, Vol 1 IB spec */
138 if (!ib_get_smp_direction(smp)) {
139 /* C14-9:1 -- sender should have incremented hop_ptr */
140 if (hop_cnt && hop_ptr == 0)
143 /* C14-9:2 -- intermediate hop */
144 if (hop_ptr && hop_ptr < hop_cnt) {
145 if (node_type != IB_NODE_SWITCH)
148 smp->return_path[hop_ptr] = port_num;
149 /* smp->hop_ptr updated when sending */
150 return (smp->initial_path[hop_ptr+1] <= phys_port_cnt);
153 /* C14-9:3 -- We're at the end of the DR segment of path */
154 if (hop_ptr == hop_cnt) {
156 smp->return_path[hop_ptr] = port_num;
157 /* smp->hop_ptr updated when sending */
159 return (node_type == IB_NODE_SWITCH ||
160 smp->dr_dlid == IB_LID_PERMISSIVE);
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);
170 if (hop_cnt && hop_ptr == hop_cnt + 1) {
172 return (smp->return_path[smp->hop_ptr] ==
177 if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
178 if (node_type != IB_NODE_SWITCH)
181 /* smp->hop_ptr updated when sending */
182 return (smp->return_path[hop_ptr-1] <= phys_port_cnt);
185 /* C14-13:3 -- We're at the end of the DR segment of path */
187 if (smp->dr_slid == IB_LID_PERMISSIVE) {
188 /* giving SMP to SM - update hop_ptr */
192 /* smp->hop_ptr updated when sending */
193 return (node_type == IB_NODE_SWITCH);
196 /* C14-13:4 -- hop_ptr = 0 -> give to SM */
197 /* C14-13:5 -- Check for unreasonable hop pointer */
198 return (hop_ptr == 0);
203 * Return 1 if the received DR SMP should be forwarded to the send queue
204 * Return 0 if the SMP should be completed up the stack
206 int smi_check_forward_dr_smp(struct ib_smp *smp)
210 hop_ptr = smp->hop_ptr;
211 hop_cnt = smp->hop_cnt;
213 if (!ib_get_smp_direction(smp)) {
214 /* C14-9:2 -- intermediate hop */
215 if (hop_ptr && hop_ptr < hop_cnt)
218 /* C14-9:3 -- at the end of the DR segment of path */
219 if (hop_ptr == hop_cnt)
220 return (smp->dr_dlid == IB_LID_PERMISSIVE);
222 /* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
223 if (hop_ptr == hop_cnt + 1)
227 if (2 <= hop_ptr && hop_ptr <= hop_cnt)
230 /* C14-13:3 -- at the end of the DR segment of path */
232 return (smp->dr_slid != IB_LID_PERMISSIVE);