drivers/net/ethernet/mellanox/mlxfw/mlxfw_mfa2_tlv.h

   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
  10 struct mlxfw_mfa2_tlv {
  11         u8 version;
  12         u8 type;
  13         __be16 len;
  14         u8 data[];
  15 } __packed;
  16
  17 static inline const struct mlxfw_mfa2_tlv *
  18 mlxfw_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
  26 static inline const void *
  27 mlxfw_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)                           \
  48 static inline const payload_type *                                             \
  49 mlxfw_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)                   \
  58 static inline const payload_type *                                             \
  59 mlxfw_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