Re: [dpdk-dev] [PATCHv4 1/5] ethdev: add new API to retrieve RX/TX queue information

[Thomas Monjalon <thomas.monjalon@6wind.com>]

2015-07-23 10:52, Ananyev, Konstantin:
> From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> > Konstantin Ananyev <konstantin.ananyev@intel.com> wrote:
> > > Add the ability for the upper layer to query RX/TX queue information.
[...]
> > Since all this data should be rxconf already, Is it possible
> > to do a generic version of this and not have to change every driver.
> 
> I don't think it is possible to implement these two functions at rte_etdev level only.
> At least not with current ethdev/PMD implementation:
> -  Inside struct rte_eth_dev_info we have only: 'struct rte_eth_rxconf default_rxconf;'.
> We don't have rxconf here for each configured rx queue.
> That information is maintained by PMD and inside PMD, different devices have different format for queue structure.
> - rte_eth_rxq_info contains not only rxconf but some extra information: mempool in use by that queue,
>  min/max possible number of descriptors.
>  Also my intention was that in future that structure would be extended to provide some RT info about queue:
>  (number of free/used descriptors from SW point of view, etc).  

Isn't it what rte_eth_rx_queue_count() provides?
Maybe we should deprecate it in favor of rte_eth_rx_queue_info_get().