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From:   Arnd Bergmann <arnd@arndb.de>
Date:   Wed, 15 May 2019 08:59:41 +0200
Message-ID: <CAK8P3a16HpKEUB7_6G_W_RKkyVeVBW_rofLbdhC2QmWjVOAHMg@mail.gmail.com>
Subject: Re: [PATCH 02/18] soc: qcom: create "include/soc/qcom/rmnet.h"
To:     Alex Elder <elder@linaro.org>
Cc:     David Miller <davem@davemloft.net>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Ilias Apalodimas <ilias.apalodimas@linaro.org>,
        subashab@codeaurora.org, stranche@codeaurora.org,
        YueHaibing <yuehaibing@huawei.com>,
        Joe Perches <joe@perches.com>, syadagir@codeaurora.org,
        mjavid@codeaurora.org, evgreen@chromium.org, benchan@google.com,
        ejcaruso@google.com, abhishek.esse@gmail.com,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Sun, May 12, 2019 at 3:25 AM Alex Elder <elder@linaro.org> wrote:

> diff --git a/include/soc/qcom/rmnet.h b/include/soc/qcom/rmnet.h
> new file mode 100644
> index 000000000000..80dcd6e68c3d
> --- /dev/null
> +++ b/include/soc/qcom/rmnet.h
> @@ -0,0 +1,38 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +/* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
> + * Copyright (C) 2018-2019 Linaro Ltd.
> + */
> +#ifndef _SOC_QCOM_RMNET_H_
> +#define _SOC_QCOM_RMNET_H_
> +
> +#include <linux/types.h>
> +
> +/* Header structure that precedes packets in ETH_P_MAP protocol */
> +struct rmnet_map_header {
> +       u8  pad_len             : 6;
> +       u8  reserved_bit        : 1;
> +       u8  cd_bit              : 1;
> +       u8  mux_id;
> +       __be16 pkt_len;
> +}  __aligned(1);

If we move this into include/soc/, I want the structure to be portable,
and avoid the bit fields. Please use mask/shift operations or the
include/linux/bits.h macros instead to make this work with big-endian
kernels.

     Arnd