This client driver allows you to use a GPIO pin as a source for PPS
[linux-2.6/next.git] / drivers / infiniband / core / smi.c
blob5855e4405d9bf2ca2b04a0fac5aebabed46c538b
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.
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
17 * conditions are met:
19 * - Redistributions of source code must retain the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer.
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
35 * SOFTWARE.
39 #include <rdma/ib_smi.h>
40 #include "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)
49 u8 hop_ptr, hop_cnt;
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)) {
60 /* C14-9:1 */
61 if (hop_cnt && hop_ptr == 0) {
62 smp->hop_ptr++;
63 return (smp->initial_path[smp->hop_ptr] ==
64 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
67 /* C14-9:2 */
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 */
73 smp->hop_ptr++;
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 */
81 smp->hop_ptr++;
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);
91 } else {
92 /* C14-13:1 */
93 if (hop_cnt && hop_ptr == hop_cnt + 1) {
94 smp->hop_ptr--;
95 return (smp->return_path[smp->hop_ptr] ==
96 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
99 /* C14-13:2 */
100 if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
101 if (node_type != RDMA_NODE_IB_SWITCH)
102 return IB_SMI_DISCARD;
104 smp->hop_ptr--;
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 */
110 if (hop_ptr == 1) {
111 smp->hop_ptr--;
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 */
119 if (hop_ptr == 0)
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)
134 u8 hop_ptr, hop_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) {
162 if (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);
175 } else {
177 /* C14-13:1 */
178 if (hop_cnt && hop_ptr == hop_cnt + 1) {
179 smp->hop_ptr--;
180 return (smp->return_path[smp->hop_ptr] ==
181 port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
184 /* C14-13:2 */
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 */
195 if (hop_ptr == 1) {
196 if (smp->dr_slid == IB_LID_PERMISSIVE) {
197 /* giving SMP to SM - update hop_ptr */
198 smp->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)
214 u8 hop_ptr, hop_cnt;
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)
231 return IB_SMI_SEND;
232 } else {
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 */
238 if (hop_ptr == 1)
239 return (smp->dr_slid != IB_LID_PERMISSIVE ?
240 IB_SMI_SEND : IB_SMI_LOCAL);
242 return 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]);