On 3 January 2018 at 21:05, David Miller <davem@xxxxxxxxxxxxx> wrote:
> From: jassisinghbrar@xxxxxxxxx
> Date: Mon, 1 Jan 2018 10:44:49 +0530
>
>> +#define DRING_TAIL(r) ((r)->tail)
>> +
>> +#define DRING_HEAD(r) ((r)->head)
>
> These macros do not help readability at all.
>
>> +#define MOVE_TAIL(r) do { \
>> + if (++(r)->tail == DESC_NUM) \
>> + (r)->tail = 0; \
>> + } while (0)
>> +
>> +#define MOVE_HEAD(r) do { \
>> + if (++(r)->head == DESC_NUM) \
>> + (r)->head = 0; \
>> + } while (0)
>> +
>> +#define JUMP_HEAD(r, n) do { \
>> + int i; \
>> + for (i = 0; i < (n); i++) \
>> + MOVE_HEAD(r); \
>> + } while (0)
>
> Neither do these.
>
OK, I have removed these.
> And JUMP_HEAD is so inefficient, it's a constant time calculation:
>
> r->head += n;
> if (r->head >= DESC_NUM)
> r->head -= DESC_NUM;
>
How about the more compact r->head = (r->head + n) % DESC_NUM
> All of this stuff can be done inline without all of these CPP macros
> which are discouraged, have multiple evaluation issues, and decrease
> the amount of type checking going on.
>
> If you absolutely must have helpers, use static functions (without
> the inline keyword, let the compiler device).
>
>> +static inline int available_descs(struct netsec_desc_ring *r)
>
> No inline functions in foo.c files, let the compiler device.
>
OK. I have already started selling it downstream.
>> +/*************************************************************/
>> +/*********************** NETDEV_OPS **************************/
>> +/*************************************************************/
>
> Please, comments are not billboards or Star Wars openning sequences.
> Simplify this, thank you.
>
Done :)
>> +
>> +static void netsec_set_tx_de(struct netsec_priv *priv,
>> + struct netsec_desc_ring *dring,
>> + const struct netsec_tx_pkt_ctrl *tx_ctrl,
>> + const struct netsec_desc *desc,
>> + struct sk_buff *skb)
>> +{
>> + struct netsec_de *de;
>> + int idx = DRING_HEAD(dring);
>> + u32 attr;
>
> Please order local variables from longest to shortest line.
>
> Please audit your entire submission for this issue.
>
That was the only occurrence. I already am particular about following
that style.
Thank you.
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