[deliverable/linux.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(u8 node_type, 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 (node_type != RDMA_NODE_IB_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 (node_type == RDMA_NODE_IB_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 (node_type != RDMA_NODE_IB_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 (node_type == RDMA_NODE_IB_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,
				       u8 node_type, int port_num)
{
	return __smi_handle_dr_smp_send(node_type, 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,
				       u8 node_type, int port_num)
{
	return __smi_handle_dr_smp_send(node_type, 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(u8 node_type, 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 (node_type != RDMA_NODE_IB_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 (node_type == RDMA_NODE_IB_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 (node_type != RDMA_NODE_IB_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 (node_type == RDMA_NODE_IB_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, u8 node_type,
				       int port_num, int phys_port_cnt)
{
	return __smi_handle_dr_smp_recv(node_type, 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, u8 node_type,
					   int port_num, int phys_port_cnt)
{
	return __smi_handle_dr_smp_recv(node_type, 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
92f15056 IW	44	static enum smi_action __smi_handle_dr_smp_send(u8 node_type, int port_num,
	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) {
07ebafba	67	if (node_type != RDMA_NODE_IB_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)++;
07ebafba	80	return (node_type == RDMA_NODE_IB_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) {
07ebafba	99	if (node_type != RDMA_NODE_IB_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 */
07ebafba	111	return (node_type == RDMA_NODE_IB_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,
	130	u8 node_type, int port_num)
	131	{
	132	return __smi_handle_dr_smp_send(node_type, port_num,
	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 IW	141	enum smi_action opa_smi_handle_dr_smp_send(struct opa_smp *smp,
	142	u8 node_type, int port_num)
	143	{
	144	return __smi_handle_dr_smp_send(node_type, port_num,
	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
86f0e67a IW	155	static enum smi_action __smi_handle_dr_smp_recv(u8 node_type, int port_num,
	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) {
07ebafba	176	if (node_type != RDMA_NODE_IB_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
07ebafba	191	return (node_type == RDMA_NODE_IB_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) {
07ebafba	211	if (node_type != RDMA_NODE_IB_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 */
de493d47	227	return (node_type == RDMA_NODE_IB_SWITCH ?
1bae4dbf	228	IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4 LT	229	}
	230
	231	/* C14-13:4 -- hop_ptr = 0 -> give to SM */
	232	/* C14-13:5 -- Check for unreasonable hop pointer */
86f0e67a	233	return (*hop_ptr == 0 ? IB_SMI_HANDLE : IB_SMI_DISCARD);
1da177e4 LT	234	}
	235	}
	236
86f0e67a IW	237	/*
	238	* Adjust information for a received SMP
	239	* Return IB_SMI_DISCARD if the SMP should be dropped
	240	*/
	241	enum smi_action smi_handle_dr_smp_recv(struct ib_smp *smp, u8 node_type,
	242	int port_num, int phys_port_cnt)
	243	{
	244	return __smi_handle_dr_smp_recv(node_type, port_num, phys_port_cnt,
	245	&smp->hop_ptr, smp->hop_cnt,
	246	smp->initial_path,
	247	smp->return_path,
	248	ib_get_smp_direction(smp),
	249	smp->dr_dlid == IB_LID_PERMISSIVE,
	250	smp->dr_slid == IB_LID_PERMISSIVE);
	251	}
	252
f28990bc IW	253	/*
	254	* Adjust information for a received SMP
	255	* Return IB_SMI_DISCARD if the SMP should be dropped
	256	*/
	257	enum smi_action opa_smi_handle_dr_smp_recv(struct opa_smp *smp, u8 node_type,
	258	int port_num, int phys_port_cnt)
	259	{
	260	return __smi_handle_dr_smp_recv(node_type, port_num, phys_port_cnt,
	261	&smp->hop_ptr, smp->hop_cnt,
	262	smp->route.dr.initial_path,
	263	smp->route.dr.return_path,
	264	opa_get_smp_direction(smp),
	265	smp->route.dr.dr_dlid ==
	266	OPA_LID_PERMISSIVE,
	267	smp->route.dr.dr_slid ==
	268	OPA_LID_PERMISSIVE);
	269	}
	270
29869eaf IW	271	static enum smi_forward_action __smi_check_forward_dr_smp(u8 hop_ptr, u8 hop_cnt,
	272	u8 direction,
	273	bool dr_dlid_is_permissive,
	274	bool dr_slid_is_permissive)
1da177e4	275	{
29869eaf	276	if (!direction) {
1da177e4 LT	277	/* C14-9:2 -- intermediate hop */
1da177e4 LT	278	if (hop_ptr && hop_ptr < hop_cnt)
1bae4dbf	279	return IB_SMI_FORWARD;
1da177e4 LT	280
	281	/* C14-9:3 -- at the end of the DR segment of path */
	282	if (hop_ptr == hop_cnt)
29869eaf	283	return (dr_dlid_is_permissive ?
de493d47	284	IB_SMI_SEND : IB_SMI_LOCAL);
1da177e4 LT	285
	286	/* C14-9:4 -- hop_ptr = hop_cnt + 1 -> give to SMA/SM */
	287	if (hop_ptr == hop_cnt + 1)
de493d47	288	return IB_SMI_SEND;
1da177e4	289	} else {
de493d47	290	/* C14-13:2 -- intermediate hop */
1da177e4	291	if (2 <= hop_ptr && hop_ptr <= hop_cnt)
1bae4dbf	292	return IB_SMI_FORWARD;
1da177e4 LT	293
	294	/* C14-13:3 -- at the end of the DR segment of path */
	295	if (hop_ptr == 1)
29869eaf	296	return (!dr_slid_is_permissive ?
de493d47	297	IB_SMI_SEND : IB_SMI_LOCAL);
1da177e4	298	}
de493d47	299	return IB_SMI_LOCAL;
29869eaf IW	300
	301	}
	302
	303	enum smi_forward_action smi_check_forward_dr_smp(struct ib_smp *smp)
	304	{
	305	return __smi_check_forward_dr_smp(smp->hop_ptr, smp->hop_cnt,
	306	ib_get_smp_direction(smp),
	307	smp->dr_dlid == IB_LID_PERMISSIVE,
	308	smp->dr_slid == IB_LID_PERMISSIVE);
1da177e4	309	}
1bae4dbf	310
f28990bc IW	311	enum smi_forward_action opa_smi_check_forward_dr_smp(struct opa_smp *smp)
	312	{
	313	return __smi_check_forward_dr_smp(smp->hop_ptr, smp->hop_cnt,
	314	opa_get_smp_direction(smp),
	315	smp->route.dr.dr_dlid ==
	316	OPA_LID_PERMISSIVE,
	317	smp->route.dr.dr_slid ==
	318	OPA_LID_PERMISSIVE);
	319	}
	320
1bae4dbf HR	321	/*
	322	* Return the forwarding port number from initial_path for outgoing SMP and
	323	* from return_path for returning SMP
	324	*/
	325	int smi_get_fwd_port(struct ib_smp *smp)
	326	{
	327	return (!ib_get_smp_direction(smp) ? smp->initial_path[smp->hop_ptr+1] :
	328	smp->return_path[smp->hop_ptr-1]);
	329	}
f28990bc IW	330
	331	/*
	332	* Return the forwarding port number from initial_path for outgoing SMP and
	333	* from return_path for returning SMP
	334	*/
	335	int opa_smi_get_fwd_port(struct opa_smp *smp)
	336	{
	337	return !opa_get_smp_direction(smp) ? smp->route.dr.initial_path[smp->hop_ptr+1] :
	338	smp->route.dr.return_path[smp->hop_ptr-1];
	339	}