On Tue, 2017-12-05 at 09:43 -0800, Bjorn Andersson wrote:
> Add the helper library for encoding and decoding QMI encoded messages.
> The implementation is taken from lib/qmi_encdec.c of the Qualcomm kernel
> (msm-3.18).
>
> Modifications has been made to the public API, source buffers has been
> made const and the debug-logging part was omitted, for now.
[]
> diff --git a/drivers/soc/qcom/qmi_encdec.c b/drivers/soc/qcom/qmi_encdec.c
[]
> +#define QMI_ENCDEC_ENCODE_TLV(type, length, p_dst) do { \
> + *p_dst++ = type; \
> + *p_dst++ = ((u8)((length) & 0xFF)); \
> + *p_dst++ = ((u8)(((length) >> 8) & 0xFF)); \
> +} while (0)
> +
> +#define QMI_ENCDEC_DECODE_TLV(p_type, p_length, p_src) do { \
> + *p_type = (u8)*p_src++; \
> + *p_length = (u8)*p_src++; \
> + *p_length |= ((u8)*p_src) << 8; \
> +} while (0)
>
> +#define QMI_ENCDEC_DECODE_N_BYTES(p_dst, p_src, size) \
> +do { \
> + memcpy(p_dst, p_src, size); \
> + p_dst = (u8 *)p_dst + size; \
> + p_src = (u8 *)p_src + size; \
> +} while (0)
> +
I dislike the asymmetric use of
p_dst being incremented by 3 and
p_src being incremented by 2 here
Is it really useful to have these macros do
any increments of arguments?
Why not a static inline and use a variant of
__be16_to_cpu/cpu_to_be16
> +static int qmi_encode_basic_elem(void *buf_dst, const void *buf_src,
> + u32 elem_len, u32 elem_size)
> +{
> + u32 i, rc = 0;
> +
> + for (i = 0; i < elem_len; i++) {
> + QMI_ENCDEC_ENCODE_N_BYTES(buf_dst, buf_src, elem_size);
> + rc += elem_size;
> + }
I find this use obscure where buf_dst and buf_src are
both modified with an addition by the macro.
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