drivers/net/ethernet/mellanox/mlxfw/mlxfw_mfa2_tlv_multi.c

   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 }