Re: [dpdk-dev] [PATCH 2/3] ethdev: fix xstats get by id APIS

[Thomas Monjalon <thomas@monjalon.net>]

20/10/2017 02:03, Ferruh Yigit:
> ethdev xstat get by id APIs:
> rte_eth_xstats_get_names_by_id()
> rte_eth_xstats_get_by_id()
> 
> Works on ids calculated as "basic stats + device specific stats"
> 
> When an application asking for id less than "basic stats count", it is
> indeed asking basic stats nothing specific to device stats.
> 
> The dev_ops PMDs implements xstats_get_names_by_id and xstats_get_by_id
> works on device specific ids.
> 
> This patch adds a check if all stats requested by ids can be provided
> via device and if so converts ids to device specific ones.
> 
> This conversion wasn't required before commit 8c49d5f1c219, because
> _by_id dev_ops were always used to get whole stats instead of specific
> ids.
> 
> Fixes: 8c49d5f1c219 ("ethdev: rework xstats retrieve by id")

It would be easier to understand if starting with a statement of bug.


> --- a/lib/librte_ether/rte_ethdev.c
> +++ b/lib/librte_ether/rte_ethdev.c
> @@ -1644,6 +1644,7 @@ rte_eth_xstats_get_names_by_id(uint16_t port_id,
>  	uint64_t *ids)
>  {
>  	struct rte_eth_xstat_name *xstats_names_copy;
> +	unsigned int all_ids_from_pmd = 1;

This variable would be better renamed as "no_basic_stat_requested".

> +			ids_copy[i] = ids[i] - basic_count;

This line may deserve a comment.