Re: [dpdk-dev] [PATCH v2 1/6] rte_ethdev: add function to check if device is owned

[Thomas Monjalon <thomas@monjalon.net>]

16/03/2020 17:09, Stephen Hemminger:
> This is a simple helper function to check if device is owned
> (being used as a sub-device).

I would suggest not restricting ownership to sub-device case.

> It is more convienent than having
> applications call rte_eth_dev_owner_get and check the result.

Yes it is more convenient but I don't like adding such simple wrapper.

I propose to extend rte_eth_dev_owner_get() behaviour:
if the owner pointer is NULL, the function returns 0 only
if an owner (not RTE_ETH_DEV_NO_OWNER) is found.

So instead of using your wrapper:
	if (rte_eth_dev_is_owned(port_id))
you can use:
	if (rte_eth_dev_owner_get(port_id, NULL) == 0)

[...]
> +int
> +rte_eth_dev_is_owned(uint16_t port_id)
> +{
> +	struct rte_eth_dev_owner owner;
> +	int ret;
> +
> +	ret = rte_eth_dev_owner_get(port_id, &owner);
> +	if (ret == 0)
> +		ret = (owner.id != RTE_ETH_DEV_NO_OWNER);
> +	return ret;
> +}