/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
/* Copyright (c) 2017-2019 Mellanox Technologies. All rights reserved */

#ifndef _MLXFW_MFA2_TLV_H
#define _MLXFW_MFA2_TLV_H

#include <linux/kernel.h>
#include "mlxfw_mfa2_file.h"

struct mlxfw_mfa2_tlv {
        u8 version;
        u8 type;
        __be16 len;
        u8 data[];
} __packed;

static inline const struct mlxfw_mfa2_tlv *
mlxfw_mfa2_tlv_get(const struct mlxfw_mfa2_file *mfa2_file, const void *ptr)
{
        if (!mlxfw_mfa2_valid_ptr(mfa2_file, ptr) ||
            !mlxfw_mfa2_valid_ptr(mfa2_file, ptr + sizeof(struct mlxfw_mfa2_tlv)))
                return NULL;
        return ptr;
}

static inline const void *
mlxfw_mfa2_tlv_payload_get(const struct mlxfw_mfa2_file *mfa2_file,
                           const struct mlxfw_mfa2_tlv *tlv, u8 payload_type,
                           size_t payload_size, bool varsize)
{
        void *tlv_top;

        tlv_top = (void *) tlv + be16_to_cpu(tlv->len) - 1;
        if (!mlxfw_mfa2_valid_ptr(mfa2_file, tlv) ||
            !mlxfw_mfa2_valid_ptr(mfa2_file, tlv_top))
                return NULL;
        if (tlv->type != payload_type)
                return NULL;
        if (varsize && (be16_to_cpu(tlv->len) < payload_size))
                return NULL;
        if (!varsize && (be16_to_cpu(tlv->len) != payload_size))
                return NULL;

        return tlv->data;
}

#define MLXFW_MFA2_TLV(name, payload_type, tlv_type)                           \
static inline const payload_type *                                             \
mlxfw_mfa2_tlv_ ## name ## _get(const struct mlxfw_mfa2_file *mfa2_file,       \
                                const struct mlxfw_mfa2_tlv *tlv)              \
{                                                                              \
        return mlxfw_mfa2_tlv_payload_get(mfa2_file, tlv,                      \
                                          tlv_type, sizeof(payload_type),      \
                                          false);                              \
}

#define MLXFW_MFA2_TLV_VARSIZE(name, payload_type, tlv_type)                   \
static inline const payload_type *                                             \
mlxfw_mfa2_tlv_ ## name ## _get(const struct mlxfw_mfa2_file *mfa2_file,       \
                                const struct mlxfw_mfa2_tlv *tlv)              \
{                                                                              \
        return mlxfw_mfa2_tlv_payload_get(mfa2_file, tlv,                      \
                                          tlv_type, sizeof(payload_type),      \
                                          true);                               \
}

#endif