1 /*
2  * drivers/net/ethernet/mellanox/mlxfw/mlxfw_mfa2_tlv_multi.c
3  * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
4  * Copyright (c) 2017 Yotam Gigi <yotamg@mellanox.com>
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions are met:
8  *
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  * 3. Neither the names of the copyright holders nor the names of its
15  *    contributors may be used to endorse or promote products derived from
16  *    this software without specific prior written permission.
17  *
18  * Alternatively, this software may be distributed under the terms of the
19  * GNU General Public License ("GPL") version 2 as published by the Free
20  * Software Foundation.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
23  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32  * POSSIBILITY OF SUCH DAMAGE.
33  */
34 
35 #define pr_fmt(fmt) "MFA2: " fmt
36 
37 #include "mlxfw_mfa2_tlv_multi.h"
38 #include <uapi/linux/netlink.h>
39 
40 #define MLXFW_MFA2_TLV_TOTAL_SIZE(tlv) \
41 	NLA_ALIGN(sizeof(*(tlv)) + be16_to_cpu((tlv)->len))
42 
43 const struct mlxfw_mfa2_tlv *
44 mlxfw_mfa2_tlv_multi_child(const struct mlxfw_mfa2_file *mfa2_file,
45 			   const struct mlxfw_mfa2_tlv_multi *multi)
46 {
47 	size_t multi_len;
48 
49 	multi_len = NLA_ALIGN(sizeof(struct mlxfw_mfa2_tlv_multi));
50 	return mlxfw_mfa2_tlv_get(mfa2_file, (void *) multi + multi_len);
51 }
52 
53 const struct mlxfw_mfa2_tlv *
54 mlxfw_mfa2_tlv_next(const struct mlxfw_mfa2_file *mfa2_file,
55 		    const struct mlxfw_mfa2_tlv *tlv)
56 {
57 	const struct mlxfw_mfa2_tlv_multi *multi;
58 	u16 tlv_len;
59 	void *next;
60 
61 	tlv_len = MLXFW_MFA2_TLV_TOTAL_SIZE(tlv);
62 
63 	if (tlv->type == MLXFW_MFA2_TLV_MULTI_PART) {
64 		multi = mlxfw_mfa2_tlv_multi_get(mfa2_file, tlv);
65 		tlv_len = NLA_ALIGN(tlv_len + be16_to_cpu(multi->total_len));
66 	}
67 
68 	next = (void *) tlv + tlv_len;
69 	return mlxfw_mfa2_tlv_get(mfa2_file, next);
70 }
71 
72 const struct mlxfw_mfa2_tlv *
73 mlxfw_mfa2_tlv_advance(const struct mlxfw_mfa2_file *mfa2_file,
74 		       const struct mlxfw_mfa2_tlv *from_tlv, u16 count)
75 {
76 	const struct mlxfw_mfa2_tlv *tlv;
77 	u16 idx;
78 
79 	mlxfw_mfa2_tlv_foreach(mfa2_file, tlv, idx, from_tlv, count)
80 		if (!tlv)
81 			return NULL;
82 	return tlv;
83 }
84 
85 const struct mlxfw_mfa2_tlv *
86 mlxfw_mfa2_tlv_multi_child_find(const struct mlxfw_mfa2_file *mfa2_file,
87 				const struct mlxfw_mfa2_tlv_multi *multi,
88 				enum mlxfw_mfa2_tlv_type type, u16 index)
89 {
90 	const struct mlxfw_mfa2_tlv *tlv;
91 	u16 skip = 0;
92 	u16 idx;
93 
94 	mlxfw_mfa2_tlv_multi_foreach(mfa2_file, tlv, idx, multi) {
95 		if (!tlv) {
96 			pr_err("TLV parsing error\n");
97 			return NULL;
98 		}
99 		if (tlv->type == type)
100 			if (skip++ == index)
101 				return tlv;
102 	}
103 	return NULL;
104 }
105 
106 int mlxfw_mfa2_tlv_multi_child_count(const struct mlxfw_mfa2_file *mfa2_file,
107 				     const struct mlxfw_mfa2_tlv_multi *multi,
108 				     enum mlxfw_mfa2_tlv_type type,
109 				     u16 *p_count)
110 {
111 	const struct mlxfw_mfa2_tlv *tlv;
112 	u16 count = 0;
113 	u16 idx;
114 
115 	mlxfw_mfa2_tlv_multi_foreach(mfa2_file, tlv, idx, multi) {
116 		if (!tlv) {
117 			pr_err("TLV parsing error\n");
118 			return -EINVAL;
119 		}
120 
121 		if (tlv->type == type)
122 			count++;
123 	}
124 	*p_count = count;
125 	return 0;
126 }
127