LXR linux/drivers/net/ethernet/mellanox/mlxfw/mlxfw_mfa2

   1/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
   2/* Copyright (c) 2017-2019 Mellanox Technologies. All rights reserved */
   3
   4#ifndef _MLXFW_MFA2_TLV_H
   5#define _MLXFW_MFA2_TLV_H
   6
   7#include <linux/kernel.h>
   8#include "mlxfw_mfa2_file.h"
   9
  10struct mlxfw_mfa2_tlv {
  11        u8 version;
  12        u8 type;
  13        __be16 len;
  14        u8 data[];
  15} __packed;
  16
  17static inline const struct mlxfw_mfa2_tlv *
  18mlxfw_mfa2_tlv_get(const struct mlxfw_mfa2_file *mfa2_file, const void *ptr)
  19{
  20        if (!mlxfw_mfa2_valid_ptr(mfa2_file, ptr) ||
  21            !mlxfw_mfa2_valid_ptr(mfa2_file, ptr + sizeof(struct mlxfw_mfa2_tlv)))
  22                return NULL;
  23        return ptr;
  24}
  25
  26static inline const void *
  27mlxfw_mfa2_tlv_payload_get(const struct mlxfw_mfa2_file *mfa2_file,
  28                           const struct mlxfw_mfa2_tlv *tlv, u8 payload_type,
  29                           size_t payload_size, bool varsize)
  30{
  31        void *tlv_top;
  32
  33        tlv_top = (void *) tlv + be16_to_cpu(tlv->len) - 1;
  34        if (!mlxfw_mfa2_valid_ptr(mfa2_file, tlv) ||
  35            !mlxfw_mfa2_valid_ptr(mfa2_file, tlv_top))
  36                return NULL;
  37        if (tlv->type != payload_type)
  38                return NULL;
  39        if (varsize && (be16_to_cpu(tlv->len) < payload_size))
  40                return NULL;
  41        if (!varsize && (be16_to_cpu(tlv->len) != payload_size))
  42                return NULL;
  43
  44        return tlv->data;
  45}
  46
  47#define MLXFW_MFA2_TLV(name, payload_type, tlv_type)                           \
  48static inline const payload_type *                                             \
  49mlxfw_mfa2_tlv_ ## name ## _get(const struct mlxfw_mfa2_file *mfa2_file,       \
  50                                const struct mlxfw_mfa2_tlv *tlv)              \
  51{                                                                              \
  52        return mlxfw_mfa2_tlv_payload_get(mfa2_file, tlv,                      \
  53                                          tlv_type, sizeof(payload_type),      \
  54                                          false);                              \
  55}
  56
  57#define MLXFW_MFA2_TLV_VARSIZE(name, payload_type, tlv_type)                   \
  58static inline const payload_type *                                             \
  59mlxfw_mfa2_tlv_ ## name ## _get(const struct mlxfw_mfa2_file *mfa2_file,       \
  60                                const struct mlxfw_mfa2_tlv *tlv)              \
  61{                                                                              \
  62        return mlxfw_mfa2_tlv_payload_get(mfa2_file, tlv,                      \
  63                                          tlv_type, sizeof(payload_type),      \
  64                                          true);                               \
  65}
  66
  67#endif
  68