LXR linux/drivers/net/ethernet/mellanox/mlxfw/mlxfw_mfa2_tlv

   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
  43const struct mlxfw_mfa2_tlv *
  44mlxfw_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
  53const struct mlxfw_mfa2_tlv *
  54mlxfw_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
  72const struct mlxfw_mfa2_tlv *
  73mlxfw_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
  85const struct mlxfw_mfa2_tlv *
  86mlxfw_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
 106int 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