[linux-2.6-block.git] / drivers / infiniband / core / smi.c

/*
 * Copyright (c) 2004, 2005 Mellanox Technologies Ltd.  All rights reserved.
 * Copyright (c) 2004, 2005 Infinicon Corporation.  All rights reserved.
 * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
 * Copyright (c) 2004, 2005 Topspin Corporation.  All rights reserved.
 * Copyright (c) 2004-2007 Voltaire Corporation.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2014 Intel 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.
 *
 */

#include <rdma/ib_smi.h>
#include "smi.h"
#include "opa_smi.h"

static enum smi_action __smi_handle_dr_smp_send(bool is_switch, int port_num,
						u8 *hop_ptr, u8 hop_cnt,
						const u8 *initial_path,
						const u8 *return_path,
						u8 direction,
						bool dr_dlid_is_permissive,
						bool dr_slid_is_permissive)
{
	/* See section 14.2.2.2, Vol 1 IB spec */
	/* C14-6 -- valid hop_cnt values are from 0 to 63 */
	if (hop_cnt >= IB_SMP_MAX_PATH_HOPS)
		return IB_SMI_DISCARD;

	if (!direction) {
		/* C14-9:1 */
		if (hop_cnt && *hop_ptr == 0) {
			(*hop_ptr)++;
			return (initial_path[*hop_ptr] ==
				port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
		}

		/* C14-9:2 */
		if (*hop_ptr && *hop_ptr < hop_cnt) {
			if (!is_switch)
				return IB_SMI_DISCARD;

			/* return_path set when received */
			(*hop_ptr)++;
			return (initial_path[*hop_ptr] ==
				port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
		}

		/* C14-9:3 -- We're at the end of the DR segment of path */
		if (*hop_ptr == hop_cnt) {
			/* return_path set when received */
			(*hop_ptr)++;
			return (is_switch ||
				dr_dlid_is_permissive ?
				IB_SMI_HANDLE : IB_SMI_DISCARD);
		}

		/* 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 ? IB_SMI_HANDLE : IB_SMI_DISCARD);

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

		/* C14-13:2 */
		if (2 <= *hop_ptr && *hop_ptr <= hop_cnt) {
			if (!is_switch)
				return IB_SMI_DISCARD;

			(*hop_ptr)--;
			return (return_path[*hop_ptr] ==
				port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
		}

		/* C14-13:3 -- at the end of the DR segment of path */
		if (*hop_ptr == 1) {
			(*hop_ptr)--;
			/* C14-13:3 -- SMPs destined for SM shouldn't be here */
			return (is_switch ||
				dr_slid_is_permissive ?
				IB_SMI_HANDLE : IB_SMI_DISCARD);
		}

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

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

/*
 * Fixup a directed route SMP for sending
 * Return IB_SMI_DISCARD if the SMP should be discarded
 */
enum smi_action smi_handle_dr_smp_send(struct ib_smp *smp,
				       bool is_switch, int port_num)
{
	return __smi_handle_dr_smp_send(is_switch, port_num,
					&smp->hop_ptr, smp->hop_cnt,
					smp->initial_path,
					smp->return_path,
					ib_get_smp_direction(smp),
					smp->dr_dlid == IB_LID_PERMISSIVE,
					smp->dr_slid == IB_LID_PERMISSIVE);
}

enum smi_action opa_smi_handle_dr_smp_send(struct opa_smp *smp,
				       bool is_switch, int port_num)
{
	return __smi_handle_dr_smp_send(is_switch, port_num,
					&smp->hop_ptr, smp->hop_cnt,
					smp->route.dr.initial_path,
					smp->route.dr.return_path,
					opa_get_smp_direction(smp),
					smp->route.dr.dr_dlid ==
					OPA_LID_PERMISSIVE,
					smp->route.dr.dr_slid ==
					OPA_LID_PERMISSIVE);
}

static enum smi_action __smi_handle_dr_smp_recv(bool is_switch, int port_num,
						int phys_port_cnt,
						u8 *hop_ptr, u8 hop_cnt,
						const u8 *initial_path,
						u8 *return_path,
						u8 direction,
						bool dr_dlid_is_permissive,
						bool dr_slid_is_permissive)
{
	/* See section 14.2.2.2, Vol 1 IB spec */
	/* C14-6 -- valid hop_cnt values are from 0 to 63 */
	if (hop_cnt >= IB_SMP_MAX_PATH_HOPS)
		return IB_SMI_DISCARD;

	if (!direction) {
		/* C14-9:1 -- sender should have incremented hop_ptr */
		if (hop_cnt && *hop_ptr == 0)
			return IB_SMI_DISCARD;

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

			return_path[*hop_ptr] = port_num;
			/* hop_ptr updated when sending */
			return (initial_path[*hop_ptr+1] <= phys_port_cnt ?
				IB_SMI_HANDLE : IB_SMI_DISCARD);
		}

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

			return (is_switch ||
				dr_dlid_is_permissive ?
				IB_SMI_HANDLE : IB_SMI_DISCARD);
		}

		/* 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 ? IB_SMI_HANDLE : IB_SMI_DISCARD);

	} else {

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

		/* C14-13:2 */
		if (2 <= *hop_ptr && *hop_ptr <= hop_cnt) {
			if (!is_switch)
				return IB_SMI_DISCARD;

			/* hop_ptr updated when sending */
			return (return_path[*hop_ptr-1] <= phys_port_cnt ?
				IB_SMI_HANDLE : IB_SMI_DISCARD);
		}

		/* C14-13:3 -- We're at the end of the DR segment of path */
		if (*hop_ptr == 1) {
			if (dr_slid_is_permissive) {
				/* giving SMP to SM - update hop_ptr */
				(*hop_ptr)--;
				return IB_SMI_HANDLE;
			}
			/* hop_ptr updated when sending */
			return (is_switch ? IB_SMI_HANDLE : IB_SMI_DISCARD);
		}

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

/*
 * Adjust information for a received SMP
 * Return IB_SMI_DISCARD if the SMP should be dropped
 */
enum smi_action smi_handle_dr_smp_recv(struct ib_smp *smp, bool is_switch,
				       int port_num, int phys_port_cnt)
{
	return __smi_handle_dr_smp_recv(is_switch, port_num, phys_port_cnt,
					&smp->hop_ptr, smp->hop_cnt,
					smp->initial_path,
					smp->return_path,
					ib_get_smp_direction(smp),
					smp->dr_dlid == IB_LID_PERMISSIVE,
					smp->dr_slid == IB_LID_PERMISSIVE);
}

/*
 * Adjust information for a received SMP
 * Return IB_SMI_DISCARD if the SMP should be dropped
 */
enum smi_action opa_smi_handle_dr_smp_recv(struct opa_smp *smp, bool is_switch,
					   int port_num, int phys_port_cnt)
{
	return __smi_handle_dr_smp_recv(is_switch, port_num, phys_port_cnt,
					&smp->hop_ptr, smp->hop_cnt,
					smp->route.dr.initial_path,
					smp->route.dr.return_path,
					opa_get_smp_direction(smp),
					smp->route.dr.dr_dlid ==
					OPA_LID_PERMISSIVE,
					smp->route.dr.dr_slid ==
					OPA_LID_PERMISSIVE);
}

static enum smi_forward_action __smi_check_forward_dr_smp(u8 hop_ptr, u8 hop_cnt,
							  u8 direction,
							  bool dr_dlid_is_permissive,
							  bool dr_slid_is_permissive)
{
	if (!direction) {
		/* C14-9:2 -- intermediate hop */
		if (hop_ptr && hop_ptr < hop_cnt)
			return IB_SMI_FORWARD;

		/* C14-9:3 -- at the end of the DR segment of path */
		if (hop_ptr == hop_cnt)
			return (dr_dlid_is_permissive ?
				IB_SMI_SEND : IB_SMI_LOCAL);

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

		/* C14-13:3 -- at the end of the DR segment of path */
		if (hop_ptr == 1)
			return (!dr_slid_is_permissive ?
				IB_SMI_SEND : IB_SMI_LOCAL);
	}
	return IB_SMI_LOCAL;

}

enum smi_forward_action smi_check_forward_dr_smp(struct ib_smp *smp)
{
	return __smi_check_forward_dr_smp(smp->hop_ptr, smp->hop_cnt,
					  ib_get_smp_direction(smp),
					  smp->dr_dlid == IB_LID_PERMISSIVE,
					  smp->dr_slid == IB_LID_PERMISSIVE);
}

enum smi_forward_action opa_smi_check_forward_dr_smp(struct opa_smp *smp)
{
	return __smi_check_forward_dr_smp(smp->hop_ptr, smp->hop_cnt,
					  opa_get_smp_direction(smp),
					  smp->route.dr.dr_dlid ==
					  OPA_LID_PERMISSIVE,
					  smp->route.dr.dr_slid ==
					  OPA_LID_PERMISSIVE);
}

/*
 * Return the forwarding port number from initial_path for outgoing SMP and
 * from return_path for returning SMP
 */
int smi_get_fwd_port(struct ib_smp *smp)
{
	return (!ib_get_smp_direction(smp) ? smp->initial_path[smp->hop_ptr+1] :
		smp->return_path[smp->hop_ptr-1]);
}

/*
 * Return the forwarding port number from initial_path for outgoing SMP and
 * from return_path for returning SMP
 */
int opa_smi_get_fwd_port(struct opa_smp *smp)
{
	return !opa_get_smp_direction(smp) ? smp->route.dr.initial_path[smp->hop_ptr+1] :
		smp->route.dr.return_path[smp->hop_ptr-1];
}
Commit	Line	Data
1da177e4	1	/*
2a1d9b7f RD	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.
de493d47	6	* Copyright (c) 2004-2007 Voltaire Corporation. All rights reserved.
2a1d9b7f	7	* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
f28990bc	8	* Copyright (c) 2014 Intel Corporation. All rights reserved.
1da177e4 LT	9	*
	10	* This software is available to you under a choice of one of two
	11	* licenses. You may choose to be licensed under the terms of the GNU
	12	* General Public License (GPL) Version 2, available from the file
	13	* COPYING in the main directory of this source tree, or the
	14	* OpenIB.org BSD license below:
	15	*
	16	* Redistribution and use in source and binary forms, with or
	17	* without modification, are permitted provided that the following
	18	* conditions are met:
	19	*
	20	* - Redistributions of source code must retain the above
	21	* copyright notice, this list of conditions and the following
	22	* disclaimer.
	23	*
	24	* - Redistributions in binary form must reproduce the above
	25	* copyright notice, this list of conditions and the following
	26	* disclaimer in the documentation and/or other materials
	27	* provided with the distribution.
	28	*
	29	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	30	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	31	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	32	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	33	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	34	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	35	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	36	* SOFTWARE.
	37	*
1da177e4 LT	38	*/
1da177e4 LT	39
a4d61e84	40	#include <rdma/ib_smi.h>
1da177e4	41	#include "smi.h"
f28990bc	42	#include "opa_smi.h"
1da177e4	43
4139032b	44	static enum smi_action __smi_handle_dr_smp_send(bool is_switch, int port_num,
92f15056 IW	45	u8 *hop_ptr, u8 hop_cnt,
	46	const u8 *initial_path,
	47	const u8 *return_path,
	48	u8 direction,
	49	bool dr_dlid_is_permissive,
	50	bool dr_slid_is_permissive)
1da177e4	51	{
1da177e4	52	/* See section 14.2.2.2, Vol 1 IB spec */
60f2b652 RD	53	/* C14-6 -- valid hop_cnt values are from 0 to 63 */
	54	if (hop_cnt >= IB_SMP_MAX_PATH_HOPS)
	55	return IB_SMI_DISCARD;
	56
92f15056	57	if (!direction) {
1da177e4	58	/* C14-9:1 */
92f15056 IW	59	if (hop_cnt && *hop_ptr == 0) {
	60	(*hop_ptr)++;
	61	return (initial_path[*hop_ptr] ==
de493d47	62	port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4 LT	63	}
	64
	65	/* C14-9:2 */
92f15056	66	if (hop_ptr && hop_ptr < hop_cnt) {
4139032b	67	if (!is_switch)
de493d47	68	return IB_SMI_DISCARD;
1da177e4	69
92f15056 IW	70	/* return_path set when received */
	71	(*hop_ptr)++;
	72	return (initial_path[*hop_ptr] ==
de493d47	73	port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4 LT	74	}
	75
	76	/* C14-9:3 -- We're at the end of the DR segment of path */
92f15056 IW	77	if (*hop_ptr == hop_cnt) {
	78	/* return_path set when received */
	79	(*hop_ptr)++;
4139032b	80	return (is_switch \|\|
92f15056	81	dr_dlid_is_permissive ?
de493d47	82	IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4 LT	83	}
	84
	85	/* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
	86	/* C14-9:5 -- Fail unreasonable hop pointer */
92f15056	87	return (*hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4 LT	88
	89	} else {
	90	/* C14-13:1 */
92f15056 IW	91	if (hop_cnt && *hop_ptr == hop_cnt + 1) {
	92	(*hop_ptr)--;
	93	return (return_path[*hop_ptr] ==
de493d47	94	port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4 LT	95	}
	96
	97	/* C14-13:2 */
92f15056	98	if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
4139032b	99	if (!is_switch)
de493d47	100	return IB_SMI_DISCARD;
1da177e4	101
92f15056 IW	102	(*hop_ptr)--;
92f15056 IW	103	return (return_path[*hop_ptr] ==
de493d47	104	port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4 LT	105	}
	106
	107	/* C14-13:3 -- at the end of the DR segment of path */
92f15056 IW	108	if (*hop_ptr == 1) {
92f15056 IW	109	(*hop_ptr)--;
1da177e4	110	/* C14-13:3 -- SMPs destined for SM shouldn't be here */
4139032b	111	return (is_switch \|\|
92f15056	112	dr_slid_is_permissive ?
de493d47	113	IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4 LT	114	}
	115
	116	/* C14-13:4 -- hop_ptr = 0 -> should have gone to SM */
92f15056	117	if (*hop_ptr == 0)
de493d47	118	return IB_SMI_HANDLE;
1da177e4 LT	119
1da177e4 LT	120	/* C14-13:5 -- Check for unreasonable hop pointer */
de493d47	121	return IB_SMI_DISCARD;
1da177e4 LT	122	}
	123	}
	124
92f15056 IW	125	/*
	126	* Fixup a directed route SMP for sending
	127	* Return IB_SMI_DISCARD if the SMP should be discarded
	128	*/
	129	enum smi_action smi_handle_dr_smp_send(struct ib_smp *smp,
4139032b	130	bool is_switch, int port_num)
92f15056	131	{
4139032b	132	return __smi_handle_dr_smp_send(is_switch, port_num,
92f15056 IW	133	&smp->hop_ptr, smp->hop_cnt,
	134	smp->initial_path,
	135	smp->return_path,
	136	ib_get_smp_direction(smp),
	137	smp->dr_dlid == IB_LID_PERMISSIVE,
	138	smp->dr_slid == IB_LID_PERMISSIVE);
	139	}
	140
f28990bc	141	enum smi_action opa_smi_handle_dr_smp_send(struct opa_smp *smp,
4139032b	142	bool is_switch, int port_num)
f28990bc	143	{
4139032b	144	return __smi_handle_dr_smp_send(is_switch, port_num,
f28990bc IW	145	&smp->hop_ptr, smp->hop_cnt,
	146	smp->route.dr.initial_path,
	147	smp->route.dr.return_path,
	148	opa_get_smp_direction(smp),
	149	smp->route.dr.dr_dlid ==
	150	OPA_LID_PERMISSIVE,
	151	smp->route.dr.dr_slid ==
	152	OPA_LID_PERMISSIVE);
	153	}
	154
4139032b	155	static enum smi_action __smi_handle_dr_smp_recv(bool is_switch, int port_num,
86f0e67a IW	156	int phys_port_cnt,
	157	u8 *hop_ptr, u8 hop_cnt,
	158	const u8 *initial_path,
	159	u8 *return_path,
	160	u8 direction,
	161	bool dr_dlid_is_permissive,
	162	bool dr_slid_is_permissive)
1da177e4	163	{
1da177e4	164	/* See section 14.2.2.2, Vol 1 IB spec */
60f2b652 RD	165	/* C14-6 -- valid hop_cnt values are from 0 to 63 */
	166	if (hop_cnt >= IB_SMP_MAX_PATH_HOPS)
	167	return IB_SMI_DISCARD;
	168
86f0e67a	169	if (!direction) {
1da177e4	170	/* C14-9:1 -- sender should have incremented hop_ptr */
86f0e67a	171	if (hop_cnt && *hop_ptr == 0)
de493d47	172	return IB_SMI_DISCARD;
1da177e4 LT	173
1da177e4 LT	174	/* C14-9:2 -- intermediate hop */
86f0e67a	175	if (hop_ptr && hop_ptr < hop_cnt) {
4139032b	176	if (!is_switch)
de493d47	177	return IB_SMI_DISCARD;
1da177e4	178
86f0e67a IW	179	return_path[*hop_ptr] = port_num;
	180	/* hop_ptr updated when sending */
	181	return (initial_path[*hop_ptr+1] <= phys_port_cnt ?
de493d47	182	IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4 LT	183	}
	184
	185	/* C14-9:3 -- We're at the end of the DR segment of path */
86f0e67a	186	if (*hop_ptr == hop_cnt) {
1da177e4	187	if (hop_cnt)
86f0e67a IW	188	return_path[*hop_ptr] = port_num;
86f0e67a IW	189	/* hop_ptr updated when sending */
1da177e4	190
4139032b	191	return (is_switch \|\|
86f0e67a	192	dr_dlid_is_permissive ?
de493d47	193	IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4 LT	194	}
	195
	196	/* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
	197	/* C14-9:5 -- fail unreasonable hop pointer */
86f0e67a	198	return (*hop_ptr == hop_cnt + 1 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4 LT	199
	200	} else {
	201
	202	/* C14-13:1 */
86f0e67a IW	203	if (hop_cnt && *hop_ptr == hop_cnt + 1) {
	204	(*hop_ptr)--;
	205	return (return_path[*hop_ptr] ==
de493d47	206	port_num ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4 LT	207	}
	208
	209	/* C14-13:2 */
86f0e67a	210	if (2 <= hop_ptr && hop_ptr <= hop_cnt) {
4139032b	211	if (!is_switch)
de493d47	212	return IB_SMI_DISCARD;
1da177e4	213
86f0e67a IW	214	/* hop_ptr updated when sending */
86f0e67a IW	215	return (return_path[*hop_ptr-1] <= phys_port_cnt ?
de493d47	216	IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4 LT	217	}
	218
	219	/* C14-13:3 -- We're at the end of the DR segment of path */
86f0e67a IW	220	if (*hop_ptr == 1) {
86f0e67a IW	221	if (dr_slid_is_permissive) {
1da177e4	222	/* giving SMP to SM - update hop_ptr */
86f0e67a	223	(*hop_ptr)--;
de493d47	224	return IB_SMI_HANDLE;
1da177e4	225	}
86f0e67a	226	/* hop_ptr updated when sending */
4139032b	227	return (is_switch ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4 LT	228	}
	229
	230	/* C14-13:4 -- hop_ptr = 0 -> give to SM */
	231	/* C14-13:5 -- Check for unreasonable hop pointer */
86f0e67a	232	return (*hop_ptr == 0 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4 LT	233	}
	234	}
	235
86f0e67a IW	236	/*
	237	* Adjust information for a received SMP
	238	* Return IB_SMI_DISCARD if the SMP should be dropped
	239	*/
4139032b	240	enum smi_action smi_handle_dr_smp_recv(struct ib_smp *smp, bool is_switch,
86f0e67a IW	241	int port_num, int phys_port_cnt)
86f0e67a IW	242	{
4139032b	243	return __smi_handle_dr_smp_recv(is_switch, port_num, phys_port_cnt,
86f0e67a IW	244	&smp->hop_ptr, smp->hop_cnt,
	245	smp->initial_path,
	246	smp->return_path,
	247	ib_get_smp_direction(smp),
	248	smp->dr_dlid == IB_LID_PERMISSIVE,
	249	smp->dr_slid == IB_LID_PERMISSIVE);
	250	}
	251
f28990bc IW	252	/*
	253	* Adjust information for a received SMP
	254	* Return IB_SMI_DISCARD if the SMP should be dropped
	255	*/
4139032b	256	enum smi_action opa_smi_handle_dr_smp_recv(struct opa_smp *smp, bool is_switch,
f28990bc IW	257	int port_num, int phys_port_cnt)
f28990bc IW	258	{
4139032b	259	return __smi_handle_dr_smp_recv(is_switch, port_num, phys_port_cnt,
f28990bc IW	260	&smp->hop_ptr, smp->hop_cnt,
	261	smp->route.dr.initial_path,
	262	smp->route.dr.return_path,
	263	opa_get_smp_direction(smp),
	264	smp->route.dr.dr_dlid ==
	265	OPA_LID_PERMISSIVE,
	266	smp->route.dr.dr_slid ==
	267	OPA_LID_PERMISSIVE);
	268	}
	269
29869eaf IW	270	static enum smi_forward_action __smi_check_forward_dr_smp(u8 hop_ptr, u8 hop_cnt,
	271	u8 direction,
	272	bool dr_dlid_is_permissive,
	273	bool dr_slid_is_permissive)
1da177e4	274	{
29869eaf	275	if (!direction) {
1da177e4 LT	276	/* C14-9:2 -- intermediate hop */
1da177e4 LT	277	if (hop_ptr && hop_ptr < hop_cnt)
1bae4dbf	278	return IB_SMI_FORWARD;
1da177e4 LT	279
	280	/* C14-9:3 -- at the end of the DR segment of path */
	281	if (hop_ptr == hop_cnt)
29869eaf	282	return (dr_dlid_is_permissive ?
de493d47	283	IB_SMI_SEND : IB_SMI_LOCAL);
1da177e4 LT	284
	285	/* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
	286	if (hop_ptr == hop_cnt + 1)
de493d47	287	return IB_SMI_SEND;
1da177e4	288	} else {
de493d47	289	/* C14-13:2 -- intermediate hop */
1da177e4	290	if (2 <= hop_ptr && hop_ptr <= hop_cnt)
1bae4dbf	291	return IB_SMI_FORWARD;
1da177e4 LT	292
	293	/* C14-13:3 -- at the end of the DR segment of path */
	294	if (hop_ptr == 1)
29869eaf	295	return (!dr_slid_is_permissive ?
de493d47	296	IB_SMI_SEND : IB_SMI_LOCAL);
1da177e4	297	}
de493d47	298	return IB_SMI_LOCAL;
29869eaf IW	299
	300	}
	301
	302	enum smi_forward_action smi_check_forward_dr_smp(struct ib_smp *smp)
	303	{
	304	return __smi_check_forward_dr_smp(smp->hop_ptr, smp->hop_cnt,
	305	ib_get_smp_direction(smp),
	306	smp->dr_dlid == IB_LID_PERMISSIVE,
	307	smp->dr_slid == IB_LID_PERMISSIVE);
1da177e4	308	}
1bae4dbf	309
f28990bc IW	310	enum smi_forward_action opa_smi_check_forward_dr_smp(struct opa_smp *smp)
	311	{
	312	return __smi_check_forward_dr_smp(smp->hop_ptr, smp->hop_cnt,
	313	opa_get_smp_direction(smp),
	314	smp->route.dr.dr_dlid ==
	315	OPA_LID_PERMISSIVE,
	316	smp->route.dr.dr_slid ==
	317	OPA_LID_PERMISSIVE);
	318	}
	319
1bae4dbf HR	320	/*
	321	* Return the forwarding port number from initial_path for outgoing SMP and
	322	* from return_path for returning SMP
	323	*/
	324	int smi_get_fwd_port(struct ib_smp *smp)
	325	{
	326	return (!ib_get_smp_direction(smp) ? smp->initial_path[smp->hop_ptr+1] :
	327	smp->return_path[smp->hop_ptr-1]);
	328	}
f28990bc IW	329
	330	/*
	331	* Return the forwarding port number from initial_path for outgoing SMP and
	332	* from return_path for returning SMP
	333	*/
	334	int opa_smi_get_fwd_port(struct opa_smp *smp)
	335	{
	336	return !opa_get_smp_direction(smp) ? smp->route.dr.initial_path[smp->hop_ptr+1] :
	337	smp->route.dr.return_path[smp->hop_ptr-1];
	338	}