[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / infiniband / core / smi.c

/*
 * 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;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (c) 2004 Mellanox Technologies Ltd. All rights reserved.
	3	* Copyright (c) 2004 Infinicon Corporation. All rights reserved.
	4	* Copyright (c) 2004 Intel Corporation. All rights reserved.
	5	* Copyright (c) 2004 Topspin Corporation. All rights reserved.
	6	* Copyright (c) 2004 Voltaire Corporation. All rights reserved.
	7	*
	8	* This software is available to you under a choice of one of two
	9	* licenses. You may choose to be licensed under the terms of the GNU
	10	* General Public License (GPL) Version 2, available from the file
	11	* COPYING in the main directory of this source tree, or the
	12	* OpenIB.org BSD license below:
	13	*
	14	* Redistribution and use in source and binary forms, with or
	15	* without modification, are permitted provided that the following
	16	* conditions are met:
	17	*
	18	* - Redistributions of source code must retain the above
	19	* copyright notice, this list of conditions and the following
	20	* disclaimer.
	21	*
	22	* - Redistributions in binary form must reproduce the above
	23	* copyright notice, this list of conditions and the following
	24	* disclaimer in the documentation and/or other materials
	25	* provided with the distribution.
	26	*
	27	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	28	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	29	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	30	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	31	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	32	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	33	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	34	* SOFTWARE.
	35	*
	36	* $Id: smi.c 1389 2004-12-27 22:56:47Z roland $
	37	*/
	38
	39	#include <ib_smi.h>
	40	#include "smi.h"
	41
	42	/*
	43	* Fixup a directed route SMP for sending
	44	* Return 0 if the SMP should be discarded
	45	*/
	46	int smi_handle_dr_smp_send(struct ib_smp *smp,
	47	u8 node_type,
	48	int port_num)
	49	{
	50	u8 hop_ptr, hop_cnt;
	51
	52	hop_ptr = smp->hop_ptr;
	53	hop_cnt = smp->hop_cnt;
	54
	55	/* See section 14.2.2.2, Vol 1 IB spec */
	56	if (!ib_get_smp_direction(smp)) {
	57	/* C14-9:1 */
	58	if (hop_cnt && hop_ptr == 0) {
	59	smp->hop_ptr++;
	60	return (smp->initial_path[smp->hop_ptr] ==
	61	port_num);
	62	}
	63
	64	/* C14-9:2 */
65	if (hop_ptr && hop_ptr < hop_cnt) {
66	if (node_type != IB_NODE_SWITCH)
67	return 0;
68
69	/* smp->return_path set when received */
70	smp->hop_ptr++;
71	return (smp->initial_path[smp->hop_ptr] ==
72	port_num);
73	}
74
75	/* C14-9:3 -- We're at the end of the DR segment of path */
76	if (hop_ptr == hop_cnt) {
77	/* smp->return_path set when received */
78	smp->hop_ptr++;
79	return (node_type == IB_NODE_SWITCH \|\|
80	smp->dr_dlid == IB_LID_PERMISSIVE);
81	}
82
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);
86
87	} else {
88	/* C14-13:1 */
89	if (hop_cnt && hop_ptr == hop_cnt + 1) {
90	smp->hop_ptr--;
91	return (smp->return_path[smp->hop_ptr] ==
92	port_num);
93	}
94
95	/* C14-13:2 */
96	if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
97	if (node_type != IB_NODE_SWITCH)
98	return 0;
99
100	smp->hop_ptr--;
101	return (smp->return_path[smp->hop_ptr] ==
102	port_num);
103	}
104
105	/* C14-13:3 -- at the end of the DR segment of path */
106	if (hop_ptr == 1) {
107	smp->hop_ptr--;
108	/* C14-13:3 -- SMPs destined for SM shouldn't be here */
109	return (node_type == IB_NODE_SWITCH \|\|
110	smp->dr_slid == IB_LID_PERMISSIVE);
111	}
112
113	/* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */
114	if (hop_ptr == 0)
115	return 1;
116
117	/* C14-13:5 -- Check for unreasonable hop pointer */
118	return 0;
119	}
120	}
121
122	/*
123	* Adjust information for a received SMP
124	* Return 0 if the SMP should be dropped
125	*/
126	int smi_handle_dr_smp_recv(struct ib_smp *smp,
127	u8 node_type,
128	int port_num,
129	int phys_port_cnt)
130	{
131	u8 hop_ptr, hop_cnt;
132
133	hop_ptr = smp->hop_ptr;
134	hop_cnt = smp->hop_cnt;
135
136	/* See section 14.2.2.2, Vol 1 IB spec */
137	if (!ib_get_smp_direction(smp)) {
138	/* C14-9:1 -- sender should have incremented hop_ptr */
139	if (hop_cnt && hop_ptr == 0)
140	return 0;
141
142	/* C14-9:2 -- intermediate hop */
143	if (hop_ptr && hop_ptr < hop_cnt) {
144	if (node_type != IB_NODE_SWITCH)
145	return 0;
146
147	smp->return_path[hop_ptr] = port_num;
148	/* smp->hop_ptr updated when sending */
149	return (smp->initial_path[hop_ptr+1] <= phys_port_cnt);
150	}
151
152	/* C14-9:3 -- We're at the end of the DR segment of path */
153	if (hop_ptr == hop_cnt) {
154	if (hop_cnt)
155	smp->return_path[hop_ptr] = port_num;
156	/* smp->hop_ptr updated when sending */
157
158	return (node_type == IB_NODE_SWITCH \|\|
159	smp->dr_dlid == IB_LID_PERMISSIVE);
160	}
161
162	/* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
163	/* C14-9:5 -- fail unreasonable hop pointer */
164	return (hop_ptr == hop_cnt + 1);
165
166	} else {
167
168	/* C14-13:1 */
169	if (hop_cnt && hop_ptr == hop_cnt + 1) {
170	smp->hop_ptr--;
171	return (smp->return_path[smp->hop_ptr] ==
172	port_num);
173	}
174
175	/* C14-13:2 */
176	if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
177	if (node_type != IB_NODE_SWITCH)
178	return 0;
179
180	/* smp->hop_ptr updated when sending */
181	return (smp->return_path[hop_ptr-1] <= phys_port_cnt);
182	}
183
184	/* C14-13:3 -- We're at the end of the DR segment of path */
185	if (hop_ptr == 1) {
186	if (smp->dr_slid == IB_LID_PERMISSIVE) {
187	/* giving SMP to SM - update hop_ptr */
188	smp->hop_ptr--;
189	return 1;
190	}
191	/* smp->hop_ptr updated when sending */
192	return (node_type == IB_NODE_SWITCH);
193	}
194
195	/* C14-13:4 -- hop_ptr = 0 -> give to SM */
196	/* C14-13:5 -- Check for unreasonable hop pointer */
197	return (hop_ptr == 0);
198	}
199	}
200
201	/*
202	* Return 1 if the received DR SMP should be forwarded to the send queue
203	* Return 0 if the SMP should be completed up the stack
204	*/
205	int smi_check_forward_dr_smp(struct ib_smp *smp)
206	{
207	u8 hop_ptr, hop_cnt;
208
209	hop_ptr = smp->hop_ptr;
210	hop_cnt = smp->hop_cnt;
211
212	if (!ib_get_smp_direction(smp)) {
213	/* C14-9:2 -- intermediate hop */
214	if (hop_ptr && hop_ptr < hop_cnt)
215	return 1;
216
217	/* C14-9:3 -- at the end of the DR segment of path */
218	if (hop_ptr == hop_cnt)
219	return (smp->dr_dlid == IB_LID_PERMISSIVE);
220
221	/* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
222	if (hop_ptr == hop_cnt + 1)
223	return 1;
224	} else {
225	/* C14-13:2 */
226	if (2 <= hop_ptr && hop_ptr <= hop_cnt)
227	return 1;
228
229	/* C14-13:3 -- at the end of the DR segment of path */
230	if (hop_ptr == 1)
231	return (smp->dr_slid != IB_LID_PERMISSIVE);
232	}
233	return 0;
234	}