[dpdk-dev] [PATCH v3 01/10] rte: change xstats to use integer ids

[Thomas Monjalon]

2016-05-30 11:48, Remy Horton:
>  struct rte_eth_xstats {
> +	/* FIXME: Remove name[] once remaining drivers converted */
>  	char name[RTE_ETH_XSTATS_NAME_SIZE];

What is the plan? This field must be deprecated with an attribute.
We cannot have 2 different APIs depending of the driver.
What are the remaining drivers to convert?

> +	uint64_t id;
>  	uint64_t value;
>  };
>  
> +/**
> + * A name-key lookup element for extended statistics.
> + *
> + * This structure is used to map between names and ID numbers
> + * for extended ethernet statistics.
> + */
> +struct rte_eth_xstats_name {
> +	char name[RTE_ETH_XSTATS_NAME_SIZE];
> +	uint64_t id;
> +};

This structure and the other one (rte_eth_xstats) are badly named.
There is only one stat in each. So they should not have the plural form.
rte_eth_xstat and rte_eth_xstat_name would be better.

[...]
>  /**
> + * Retrieve names of extended statistics of an Ethernet device.
> + *
> + * @param port_id
> + *   The port identifier of the Ethernet device.
> + * @param ptr_names
> + *  Block of memory to insert names into. Must be at least limit in size.

"xstat_names" would be a better name than "ptr_names".
We don't use ptr in the variable names because it doesn't really convey a
semantic information.

> + * @param limit
> + *  Capacity of ptr_strings (number of names).

We are more used to "size" than "limit".

> + * @return
> + *  If successful, number of statistics; negative on error.
> + */
> +int rte_eth_xstats_names(uint8_t port_id, struct rte_eth_xstats_name *ptr_names,

Why not rte_eth_xstats_get_names?

> +	unsigned limit);

A (double) indent tab is missing.

> +
> +/**
> + * Retrieve number of extended statistics of an Ethernet device.
> + *
> + * @param port_id
> + *   The port identifier of the Ethernet device.
> + * @return
> + *  If successful, number of statistics; negative on error.
> + */
> +int rte_eth_xstats_count(uint8_t port_id);

This function is useless because we can have the count with
rte_eth_xstats_get(p, NULL, 0)
By the way it would be more consistent to have the same behaviour
in rte_eth_xstats_names().