aboutsummaryrefslogtreecommitdiff
path: root/drivers/infiniband/core/smi.c
blob: b4b284324a33a5be9356dd1f01ba1dae71b70889 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
/*
 * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
 * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
 * Copyright (c) 2004 Intel Corporation.  All rights reserved.
 * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
 * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id: smi.c 1389 2004-12-27 22:56:47Z roland $
 */

#include <ib_smi.h>
#include "smi.h"

/*
 * Fixup a directed route SMP for sending
 * Return 0 if the SMP should be discarded
 */
int smi_handle_dr_smp_send(struct ib_smp *smp,
			   u8 node_type,
			   int port_num)
{
	u8 hop_ptr, hop_cnt;

	hop_ptr = smp->hop_ptr;
	hop_cnt = smp->hop_cnt;

	/* See section 14.2.2.2, Vol 1 IB spec */
	if (!ib_get_smp_direction(smp)) {
		/* C14-9:1 */
		if (hop_cnt && hop_ptr == 0) {
			smp->hop_ptr++;
			return (smp->initial_path[smp->hop_ptr] ==
				port_num);
		}

		/* C14-9:2 */
		if (hop_ptr && hop_ptr < hop_cnt) {
			if (node_type != IB_NODE_SWITCH)
				return 0;

			/* smp->return_path set when received */
			smp->hop_ptr++;
			return (smp->initial_path[smp->hop_ptr] ==
				port_num);
		}

		/* C14-9:3 -- We're at the end of the DR segment of path */
		if (hop_ptr == hop_cnt) {
			/* smp->return_path set when received */
			smp->hop_ptr++;
			return (node_type == IB_NODE_SWITCH ||
				smp->dr_dlid == IB_LID_PERMISSIVE);
		}

		/* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
		/* C14-9:5 -- Fail unreasonable hop pointer */
		return (hop_ptr == hop_cnt + 1);

	} else {
		/* C14-13:1 */
		if (hop_cnt && hop_ptr == hop_cnt + 1) {
			smp->hop_ptr--;
			return (smp->return_path[smp->hop_ptr] ==
				port_num);
		}

		/* C14-13:2 */
		if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
			if (node_type != IB_NODE_SWITCH)
				return 0;

			smp->hop_ptr--;
			return (smp->return_path[smp->hop_ptr] ==
				port_num);
		}

		/* C14-13:3 -- at the end of the DR segment of path */
		if (hop_ptr == 1) {
			smp->hop_ptr--;
			/* C14-13:3 -- SMPs destined for SM shouldn't be here */
			return (node_type == IB_NODE_SWITCH ||
				smp->dr_slid == IB_LID_PERMISSIVE);
		}

		/* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */
		if (hop_ptr == 0)
			return 1;

		/* C14-13:5 -- Check for unreasonable hop pointer */
		return 0;
	}
}

/*
 * Adjust information for a received SMP
 * Return 0 if the SMP should be dropped
 */
int smi_handle_dr_smp_recv(struct ib_smp *smp,
			   u8 node_type,
			   int port_num,
			   int phys_port_cnt)
{
	u8 hop_ptr, hop_cnt;

	hop_ptr = smp->hop_ptr;
	hop_cnt = smp->hop_cnt;

	/* See section 14.2.2.2, Vol 1 IB spec */
	if (!ib_get_smp_direction(smp)) {
		/* C14-9:1 -- sender should have incremented hop_ptr */
		if (hop_cnt && hop_ptr == 0)
			return 0;

		/* C14-9:2 -- intermediate hop */
		if (hop_ptr && hop_ptr < hop_cnt) {
			if (node_type != IB_NODE_SWITCH)
				return 0;

			smp->return_path[hop_ptr] = port_num;
			/* smp->hop_ptr updated when sending */
			return (smp->initial_path[hop_ptr+1] <= phys_port_cnt);
		}

		/* C14-9:3 -- We're at the end of the DR segment of path */
		if (hop_ptr == hop_cnt) {
			if (hop_cnt)
				smp->return_path[hop_ptr] = port_num;
			/* smp->hop_ptr updated when sending */

			return (node_type == IB_NODE_SWITCH ||
				smp->dr_dlid == IB_LID_PERMISSIVE);
		}

		/* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
		/* C14-9:5 -- fail unreasonable hop pointer */
		return (hop_ptr == hop_cnt + 1);

	} else {

		/* C14-13:1 */
		if (hop_cnt && hop_ptr == hop_cnt + 1) {
			smp->hop_ptr--;
			return (smp->return_path[smp->hop_ptr] ==
				port_num);
		}

		/* C14-13:2 */
		if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
			if (node_type != IB_NODE_SWITCH)
				return 0;

			/* smp->hop_ptr updated when sending */
			return (smp->return_path[hop_ptr-1] <= phys_port_cnt);
		}

		/* C14-13:3 -- We're at the end of the DR segment of path */
		if (hop_ptr == 1) {
			if (smp->dr_slid == IB_LID_PERMISSIVE) {
				/* giving SMP to SM - update hop_ptr */
				smp->hop_ptr--;
				return 1;
			}
			/* smp->hop_ptr updated when sending */
			return (node_type == IB_NODE_SWITCH);
		}

		/* C14-13:4 -- hop_ptr = 0 -> give to SM */
		/* C14-13:5 -- Check for unreasonable hop pointer */
		return (hop_ptr == 0);
	}
}

/*
 * Return 1 if the received DR SMP should be forwarded to the send queue
 * Return 0 if the SMP should be completed up the stack
 */
int smi_check_forward_dr_smp(struct ib_smp *smp)
{
	u8 hop_ptr, hop_cnt;

	hop_ptr = smp->hop_ptr;
	hop_cnt = smp->hop_cnt;

	if (!ib_get_smp_direction(smp)) {
		/* C14-9:2 -- intermediate hop */
		if (hop_ptr && hop_ptr < hop_cnt)
			return 1;

		/* C14-9:3 -- at the end of the DR segment of path */
		if (hop_ptr == hop_cnt)
			return (smp->dr_dlid == IB_LID_PERMISSIVE);

		/* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
		if (hop_ptr == hop_cnt + 1)
			return 1;
	} else {
		/* C14-13:2 */
		if (2 <= hop_ptr && hop_ptr <= hop_cnt)
			return 1;

		/* C14-13:3 -- at the end of the DR segment of path */
		if (hop_ptr == 1)
			return (smp->dr_slid != IB_LID_PERMISSIVE);
	}
	return 0;
}